90-ZCA-03 CARBURETOR ADJUSTMENT TABLE 1

SERVICE DATA
Carburetor Adjustment Table
(European specification)

INTRODUCTION
Refer to SERVICE MANUAL Ref. No. 400-09 “CARBURETOR ADJUSTMENT” and
SERVICE DATA of each model for detailed adjustment procedure.

CONTENTS
1. Special tool for carburetor adjustment��������������������������������������������������������������������������3
2. Limiter cap and limiter plug��������������������������������������������������������������������������������������������3
3. Limiter cap and limiter plug reference chart�����������������������������������������������������������������3
4. Verify clutch engagement speed for safety�������������������������������������������������������������������3
5. Chain saw, Engine cutter�������������������������������������������������������������������������������������������������4
6. Trimmer/Brushcutter, Clearing saw������������������������������������������������������������������������������10
7. Hedge trimmer����������������������������������������������������������������������������������������������������������������20
8. Shafted hedge trimmer, Pro-attachment series, Pruner, Engine drill, Earth auger��22
9. Duster/Mist blower, Blower, Shred ‘N’ Vac, Sprayer���������������������������������������������������28

Reference No. 90-ZCA-03

UPDATE: Sep. 30, 2021
REVISED : 201811
ISSUED: 201603

Copyright(C)2018 YAMABIKO Corporation All rights reserved.

 CARBURETOR ADJUSTMENT TABLE 2
Because of regional requirement and/or variety of component(s), there are
specification differences on the same model name.
The specifications are coded and incorporated with machine serial number for
easy and accurate recognition.
There are 2 types of serial numbers; namely 8-digit and 12-digit.

On 8-digit serial number, the first 2 digits represent the specification code.
38005035

Specification code: 38
On 12-digit serial number, ignore the first 4 digits include alphabet, and the
next 2 digits represent the specification code.

4 digits include alphabet

Specification code: 20
The model name in this publication are described with specification code as
CS-501SX (38), SRM-420ES (38), HCA-265ES-HD (38), PB-2520 (38), etc.

Followings are specification codes and the meanings.

30: Russian
33: Turkish
35: EU before Emission directive became effective
36: EU Emission directive ST1
37: EU Emission directive ST2
38: EU Emission directive ST5
02 to 15: North American
26: Latin American
20, 22, 24, 25: Other than the above

--- Symbols used in carburetor adjustment table ---

: PI (Proportional integral) controller installed model

: Use Tachometer PET-1000R to read engine speed
: See NOTE below
: With shield
: Without shield
: Use Load adapter #91156

TAS: Throttle Adjust Screw WOT: Wide Open Throttle CW: Clockwise CCW: Counterclockwise
 CARBURETOR ADJUSTMENT TABLE 3
1. Special tool for carburetor adjustment
1 2 3 4 5
91
01
9 91
02
0

Key Part Number Description Reference

1 897802-33330 Tachometer PET-1000R Measuring engine speed to adjust carburetor

2 91019 Limiter cap tool Removing and installing Limiter cap

3 91020 Limiter plug tool Removing and installing Limiter plug

4 Y089-000095 Carburetor adjustment tool Adjusting Carburetor

5 X603-000070 D-shaped tool (M) Adjusting Carburetor

6 91159S Short type D-shaped tool (S) Adjusting Carburetor

To adjust carburetor, standard tools may be required such as Phillips-head screw driver and/or flat-blade screw driver.

2. Limiter cap and limiter plug

On some models, limiter caps or limiter plug(s) have been installed on L (and H) mixture needle(s) of several types
of carburetor. When adjusting carburetor, these limiter caps or limiter plug(s) should be removed.
To remove and install limiter caps or limiter plug(s), follow the procedure in SERVICE MANUAL Ref. No. 400-09
“CARBURETOR ADJUSTMENT “.
IMPORTANT: In the country where an Emission directive/regulation is enforced, limiter caps or limiter plug(s) must
be installed on L (and H) mixture needle(s) after adjusting carburettor, to comply with Emission directive/regula-
tion.

3. Limiter cap and limiter plug reference chart

Reference Reference
Part Number Shape Part Number Shape
number number

C1 A259-000030 C6 P005-001530

C7 A259-000050
Limiter
C2 125329-09860
cap
C8 125329-08560

Limiter C3 125329-39030
cap C9 A259-000040

P1 A259-000000
C4 P003-000010
Limiter
plug P2 P005-001270
C5 P005-001520
P5 A259-000060

4. Verify clutch engagement speed for safety

After adjusting carburetor, verify clutch engagement speed. If it is less than 1.25 times the idle speed, adjust the
idle speed by turning Throttle adjust screw (TAS) counterclockwise.
 5. Chain saw, Engine cutter 4

Table 1: Limiter cap / plug Table 2: Tool

C4 P003-000010 Fig. 1: Idle setting Fig. 2: WOT setting Fig. 4: WOT setting
a
15000
Screwdriver 2 mm
C7 A259-000050 6000 14000
Step6
Step2 Step7

Engine speed
Engine speed
Step1 Step6

Engine speed
Step1
b by TAS
Step3 Step5 Step1
4000 Idle rich down 12000 Step5
Screwdriver 2.5 mm
Step4
8000

H mixture needle adjustment

H mixture needle adjustment
d 2000 L mixture needle adjustment

D-shaped (L)

2 1 0 2 1 0
1 0
e Counterclockwise Clockwise Counterclockwise Clockwise
2

= Richer = Leaner Counterclockwise Clockwise

= Richer = Leaner
D-shaped (M) Needle adjustment Needle adjustment
= Richer = Leaner
Needle adjustment

Step 8:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.4 Verify final engine speed with
standard equipment
Engine Step 2:
warm-up Adjust L mixture Step 5:
needle Turn H mixture needle
Tool to Step 4:
Throttle Idle - WOT: to max. idle speed Turn L mixture CCW to confirm engine Step 7:
Limiter adjust Final Idle Final WOT
Model Carburetor H mixture L mixture Adjust Total *1 speed reduces Turn H mixture
cap/plug mixture needle CCW to range range
(Spec. code) (Parts No.) needle needle Screw (sec.) needle
(Table 1) needles set idle speed (r/min) (r/min)
(TAS) Step 3: Step 6: CW
(Table 2) (r/m)
Set idle speed Adjust H mixture needle
with TAS (r/m) to set WOT (r/m) *2

WT-1153 12700 - 13100

CS-2510TES (37) - d 2 5/8 1 7/8 1 5/8 5 - 5 : 100 4000 3200 12400 - 12600 1/4 2800 - 3600
(A021-004520)
WT-1153
CS-2511TES (37)(38) (A021-004520) 2 5/8 1 7/8 1 5/8 12700 - 13400
- d 5 - 5 : 100 4200 3200 12500 - 12700 1/2 2800 - 3600
Sticker label WT-1153B 2 2 1/2 1 1/2
(A021-004522)
WT-1153
(A021-004520)
CS-2511TES (37) 2 5/8 1 7/8 1 5/8
WT-1153B 12700 - 13400
(38) - d 2 2 1/2 1 1/2 5 - 5 : 30 4200 3400 12500 - 12700 1/2 3100 - 3300
(A021-004522)
Laser etched label 2 2 1/2 1 1/2
WT-1231
(A021005160)
PI: To change from Operation mode to Carburetor adjustment mode,
1. Start engine without brake activated.
2. Engine warm-up with fast idle for 120 seconds. The speed should be within 6,000 - 10,000 r/min. If not, adjust the speed by turning H mixture needle.
CS-2511WES (38) WT-1230 12800 - 13400
Mixed two-stroke - d 1 3/4 2 1/2 1 1/2 5 - 5 : 30 4100 3300 - - 3100 - 3300
(A021-005020)
regular fuel
CS-2511WES (38) WT-1230 12800 - 13400
Mixed two-stroke E10 - d 2 2 1/2 1 1/2 5 - 5 : 30 4100 3300 - - 3100 - 3300
(A021-005020)
fuel
CS-2511WES (38) WT-1230 12800 - 13400
- d 2 1/4 2 1/2 1 1/2 5 - 5 : 30 4100 3300 - - 3100 - 3300
Premixed alkylate fuel (A021-005020)

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 Must make adjustments with guide bar and chain provided with product.
 5. Chain saw, Engine cutter 5
Step 8:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.4 Verify final engine speed with
standard equipment
Engine Step 2:
warm-up Adjust L mixture Step 5:
needle Turn H mixture needle
Tool to Step 4:
Throttle Idle - WOT: to max. idle speed Turn L mixture CCW to confirm engine Step 7:
Limiter adjust Final Idle Final WOT
Model Carburetor H mixture L mixture Adjust Total *1 speed reduces Turn H mixture
cap/plug mixture needle CCW to range range
(Spec. code) (Parts No.) needle needle Screw (sec.) needle
(Table 1) needles set idle speed (r/min) (r/min)
(TAS) Step 3: Step 6: CW
(Table 2) (r/m)
Set idle speed Adjust H mixture needle
with TAS (r/m) to set WOT (r/m) *2

PI: To change from Operation mode to Carburetor adjustment mode,

1. Start engine without brake activated.
2. Engine warm-up with fast idle for 120 seconds. The speed should be within 6,000 - 10,000 r/min. If not, adjust the speed by turning H mixture needle.
CS-2600 (36) WT-696C
C4 a 2 3/8 2 3/8 1 7/8 5 - 5 : 70 4400 3350 10700 - 11200 - 3000 - 3600 10500 - 11500
CS-2600ES (36) (A021-000973)
WT-697C
CS-2700ES (36) C4 a 2 1/2 2 3/8 1 7/8 5 - 5 : 70 4400 3350 10700 - 11200 - 3000 - 3600 10500 - 11500
(A021-000963)
WT-843
CS-260TES (36) C4 a 1 7/8 1 5/8 2 1/8 5 - 5 : 70 4400 3350 11700 - 12300 - 2800 - 3600 11500 - 12500
(A021-001403)
WT-845
CS-270WES (36) C4 a 1 7/8 1 5/8 2 1/8 5 - 5 : 70 4400 3350 11700 - 12300 - 2800 - 3600 11500 - 12500
(A021-001421)
2900
CS-280T (37)(38) WT-1085
- d 3 3/8 2 1 1/4 5 - 10 : 150 3600 Inclease 3200 12700 - 12900 - 2900 - 3500 12400 - 13300
CS-280TES (37)(38) (A021-004191)
by TAS
WT-1026
CS-280WES (37) - d 2 3/4 2 1/2 1 3/8 5 - 5 : 120 3800 3200 11400 - 11800 - 2900 - 3500 11100 - 12500
(A021-003743)
WT-1108
CS-281WES (37)(38) - d 3 3/4 2 1/2 2 5 - 10 : 100 4200 3200 12300 - 12500 - 3000 - 3500 12000 - 12800
(A021-004290)
WT-402B
CS-3000 (36) C4 a 1 1/2 1 1/4 1 3/4 10 - 5 : 120 4200 3200 10500 - 11500 - 2700 - 3500 9000 - 12000
(123001-39136)
WT-402B
CS-3400 (36) C4 a 1 1/2 1 1/4 2 1/8 10 - 5 : 120 4200 3200 10500 - 11500 - 2700 - 3500 9000 - 12000
(123001-39136)
WT-1084
CS-303T (37)(38) - d 1 3/4 1 1/4 1 1/4 10 - 10 : 60 4000 3200 11600 - 11800 - 2900 - 3700 11500 - 12000
(A021-004181)
NOTE: After initial setting, run engine with fast idle 60 seconds and then confirm the fast idle speed within 8,000 - 10,000 r/min.
WT-946
CS-310ES (37)(38) C4 a 2 1/4 2 1/2 7/8 5 - 5 : 120 3700 3200 12750 - 12950 - 2800 - 3600 12000 - 13000
(A021-001700)
WT-698
(A021-000860)
2 7/8 2 1
CS-320T (36) WT-698A
C4 a 2 7/8 2 3/4 1 5 - 10 : 120 4200 3300 12500 - 13000 - 3100 - 3500 12500 - 13500
CS-320TES (36) (A021-000861)
2 7/8 2 3/4 1
WT-698B
(A021-000865)

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 Must make adjustments with guide bar and chain provided with product.
 5. Chain saw, Engine cutter 6
Step 8:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.4 Verify final engine speed with
standard equipment
Engine Step 2:
warm-up Adjust L mixture Step 5:
needle Turn H mixture needle
Tool to Step 4:
Throttle Idle - WOT: to max. idle speed Turn L mixture CCW to confirm engine Step 7:
Limiter adjust Final Idle Final WOT
Model Carburetor H mixture L mixture Adjust Total *1 speed reduces Turn H mixture
cap/plug mixture needle CCW to range range
(Spec. code) (Parts No.) needle needle Screw (sec.) needle
(Table 1) needles set idle speed (r/min) (r/min)
(TAS) Step 3: Step 6: CW
(Table 2) (r/m)
Set idle speed Adjust H mixture needle
with TAS (r/m) to set WOT (r/m) *2

WT-699
(A021-000850)
WT-699A 2 5/8 2 1/8 4 7/8
CS-350T (36) (A021-000851) 2 7/8 2 1/8 4 7/8
C4 a 5 - 10 : 120 4200 3200 12800 - 13200 - 2900 - 3500 12500 - 13500
CS-350TES (36) WT-698A 2 7/8 2 3/4 4 7/8
(A021-000861) 3 1/2 1 3/4 4 7/8
WT-698B
(A021-000865)
WT-1149
CS-355T (36) - d 2 5/8 2 5/8 1 3/8 5 - 10 : 100 3800 2800 13000 - 13300 1/2 2700 - 3300 13800 - 14300
(A021-004460)
WT-722
(A021-001020)
WT-722A 2 7/8 1 7/8 2 1/8
(A021-001021) 2 3/8 1 7/8 2 1/8
CS-350WES (36) C4 a 5 - 10 : 120 4000 3200 12800 - 13200 - 2900 - 3500 12500 - 13500
WT-721 3 1/8 2 1/8 2 1/8
(A021-001190) 3 1/2 1 3/4 2 1/8
WT-721A
(A021-001191)
WT-897
CS-350WES (36) C4 a 3 1 3/4 1 3/8 5 - 10 : 120 3900 2700 12800 - 13200 - 2300 - 3100 12000 - 13500
(A021-001563)
WT-897
CS-351WES (36) C4 a 3 1 3/4 1 3/8 5 - 5 : 120 3900 2700 12000 - 12600 - 2300 - 3100 12000 - 13500
(A021-001563)
WT-1237 12500 - 13200
CS-3510AC (38) C4 a 3 3/8 3 3/4 5 - 10 : 150 4100 3300 12500 - 13200 - 2800 - 3400
(A021-005190)
WT-1240 13000 - 13600
CS-3510ES (38) - d 3 1/4 2 7/8 1 1/8 5 - 10 : 150 3900 3000 13300 - 13600 - 2800 - 3500
(A021-005280)
CS-352ES WT-991
- d 3 1/4 2 3/4 1 1/2 5 - 5 : 120 3800 2800 12200 - 12400 - 2700 - 3300 11700 - 12700
(37)(38) (A021-003342)
WT-1216
CS-352AC (38) C4 a 2 1/8 1 1/2 1 1/2 5 - 5 : 150 4200 3200 12700 - 13300 - 3000 - 3400 12500 - 13500
(A021-004760)
C1Q-K109
CS-360WES (37) - d 2 1/8 1 1/2 1 1/8 5 - 5 : 100 3900 3200 12600 - 13000 - 2800 - 3600 12500 - 13100
(A021-003780)
C1Q-K120A
CS-360TES (37) - d 2 3/8 1 7/8 1 1/8 5 - 10 : 150 3600 3000 11900 - 12200 1/2 2700 - 3300 13000 - 14000
(A021-004210)
C1Q-110124A
CS-361WES (37) - d 2 1/2 1 5/8 1 7/8 5 - 5 : 100 4200 3200 13000 - 14000 - 2800 - 3500 13000 - 14000
(A021-004400)
C1Q-Z011/70B
CS-362TES (38) - d 2 3/8 1 7/8 1 1/8 5 - 10 : 150 3600 3000 11900 - 12200 1/2 2700 - 3300 13000 - 14000
(A021-004210)
C1Q-Z011/71B
CS-362WES (38) - d 2 1/2 1 5/8 1 7/8 5 - 5 : 100 4200 3200 13000 - 14000 - 2800 - 3500 13000 - 14000
(A021-004400)

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 Must make adjustments with guide bar and chain provided with product.
 5. Chain saw, Engine cutter 7
Step 8:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.4 Verify final engine speed with
standard equipment
Engine Step 2:
warm-up Adjust L mixture Step 5:
needle Turn H mixture needle
Tool to Step 4:
Throttle Idle - WOT: to max. idle speed Turn L mixture CCW to confirm engine Step 7:
Limiter adjust Final Idle Final WOT
Model Carburetor H mixture L mixture Adjust Total *1 speed reduces Turn H mixture
cap/plug mixture needle CCW to range range
(Spec. code) (Parts No.) needle needle Screw (sec.) needle
(Table 1) needles set idle speed (r/min) (r/min)
(TAS) Step 3: Step 6: CW
(Table 2) (r/m)
Set idle speed Adjust H mixture needle
with TAS (r/m) to set WOT (r/m) *2

CS-3500 (36) WT-700

C4 a 2 3/8 2 1/4 1 3/8 10 - 5 : 120 4000 3000 11500 - 12000 - 2600 - 3500 10500 - 12000
CS-3501 (36) (A021-000872)
WT-416C
CS-3700 (36) (123000-39333) 3 1 1/4 1 1/8
C4 a 5 - 5 : 120 3700 2700 11600 - 12400 - 2300 - 3000 11500 - 12500
CS-3700ES (36) WT-812 3 1/2 1 1/4 1 3/4
(A021-001280)
WT-820A
(A021-001310) C4 a 12300 - 12800
CS-370ES (37) 2 3/8 1 1/4 1 5/8 5 - 5 : 120 3800 2600 - 2400 - 2900 12000 - 13000
WT-950 - d 12200 - 12800
(A021-001790)
WT-980
CS-370ES (37)(38) - d 2 1/2 1 1/2 2 3/8 5 - 5 : 120 3500 2600 11700 - 12300 - 2400 - 2900 11500 - 12500
(A021-001900)
WT-1055
CS-390ESX (37)(38) - d 3 1/2 2 3/8 1 3/8 5 - 5 : 100 3700 3000 12800 - 13200 - 2700 - 3500 12500 - 13500
(A021-004001)
WT-820A
(A021-001310) C4 a
CS-420ES (37) 2 3/4 1 3/8 1 3/8 5 - 5 : 120 3800 2600 12400 - 12800 - 2400 - 2900 12300 - 13000
WT-950 - d
(A021-001790)
WT-980
CS-420ES (37)(38) - d 2 3/4 1 3/8 1 3/8 5 - 5 : 120 3500 2600 11600 - 12100 - 2400 - 2900 11500 - 12200
(A021-001900)
C1Q-110132B
CS-420EMS (37)(38) - e 2 1/2 Fixed jet 2 3/8 NOTE: Since this model has Electric Management System (EMC), refer to SERVICE DATA for detailed adjustment.
(A021-004590)
CS-4200 (36) WT-594
C4 a 2 5/8 1 1/4 1 3/8 5 - 5 : 120 3700 2700 11500 - 12500 - 2300 - 3000 11500 - 12500
CS-4200ES (36) (A021-000220)
CS-4310SX (38) HD-68
- d 3 1/2 2 2 5 - 5 : 150 3800 2800 13200-13600 - 2700 - 3000 13200-13600
Mixed two-stroke fuel (A021-005350)
CS-4310SX (38) HD-68
- d 3 1/2 2 2 5 - 5 : 150 3800 2800 12800-13200 - 2700 - 3000 12800-13200
Premixed alkylate fuel (A021-005350)
WT-416C
CS-4400 (36) C4 a 3 1 1/4 1 1/2 10 - 5 : 120 3500 2500 11500 - 13000 - 2300 - 2800 11500 - 13000
(123000-39333)
WT-901A
CS-450 (33)(36)(37) C4 a 3 3/8 1 1/2 1 7/8 5 - 5 : 120 3900 2500 12300 - 12700 - 2400 - 3000 12000 - 13000
(A021-001471)
NOTE: After putting limiter cap on L mixture needle, turn L mixture needle CW to 2700 r/m idling speed.

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 Must make adjustments with guide bar and chain provided with product.
 5. Chain saw, Engine cutter 8
Step 8:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.4 Verify final engine speed with
standard equipment
Engine Step 2:
warm-up Adjust L mixture Step 5:
needle Turn H mixture needle
Tool to Step 4:
Throttle Idle - WOT: to max. idle speed Turn L mixture CCW to confirm engine Step 7:
Limiter adjust Final Idle Final WOT
Model Carburetor H mixture L mixture Adjust Total *1 speed reduces Turn H mixture
cap/plug mixture needle CCW to range range
(Spec. code) (Parts No.) needle needle Screw (sec.) needle
(Table 1) needles set idle speed (r/min) (r/min)
(TAS) Step 3: Step 6: CW
(Table 2) (r/m)
Set idle speed Adjust H mixture needle
with TAS (r/m) to set WOT (r/m) *2

C1Q-110138C
CS-4510ES (37)(38)
(A021-004810)
Mixed two-stroke fuel - d 2 7/8 1 7/8 8 1/8* 5 - 10 : 150 4100 3100 12250 - 12550 - 2700 - 3500 12250 - 12650
C1Q-Z011/73B
(A021-004811)
3100
C1Q-110138C 12250 - 12550
CS-4510ES (37)(38) Verify smooth
(A021-004810) Do not turn the needle
Premixed alkylate fuel - d 2 7/8 1 7/8 8 1/8* 5 - 10 : 150 4100 acceleration. If - 2700 - 3500 12250 - 12650
C1Q-Z011/73B more than 1/4 turn CW from
not, turn TAS 1/4
(A021-004811) standard state.
turn CW.
NOTE: After engine warming up, verify engine speed and smooth acceleration. If the Idle speed and WOT speed are within Final engine speeds on Step 8, the carburetor adjustment is completed.
WT-864
CS-452ESX (36) - d 2 1/4 2 5/8 3 1/2 5 - 5 : 100 4300 2800 13200 - 13400 - 2600 - 3000 13000 - 13500
(A021-003040)
WT-1011
CS-490ES (37)(38) - d 3 1/8 1 1/2 2 5 - 5 : 100 3500 2900 11800 - 12000 - 2800 - 3500 11800 - 12500
(A021-003561)
WT-1011
CS-500ES (37) - d 3 1/8 1 1/2 2 5 - 5 : 100 3500 2900 11800 - 12000 - 2800 - 3500 11800 - 12500
(A021-003561)
CS-501SX (37)(38) WT-1139
- d 3 5/8 1 3/4 2 1/8 5 - 5 : 100 3500 2700 13000 - 13800 - 2300 - 3100 13000 - 13800
CS-501SXH (37)(38) (A021-004410)
C1Q-K79B
CS-5100 (36) C7 a 2 1/4 1 1/2 2 10 - 5 : 120 3500 2500 12500 - 13500 - 2300 - 2800 12500 - 13500
(A021-001004)
C1Q-K79B
CS-510 (33)(36) C7 a 2 1/4 1 1/2 2 10 - 5 : 120 3500 2500 12500 - 13500 - 2300 - 2800 12500 - 13500
(A021-001004)
WLA-4
CS-550 (37) - d 3 3/8 1 3/8 1 3/8 10 - 10 : 120 3600 2800 12800 - 13000 - 2600 - 3000 12500 - 13500
(A021-003360)
HDA-268A
CS-590 (37)(38) C4 a 3/4 1 3/4 1 5 - 5 : 120 3600 2800 12100 - 12300 - 2600 - 3200 11800 - 12800
(A021-001661)
HDA-268A
CS-600 (33)(36) C4 a 3/4 2 2 3/8 5 - 5 : 120 3600 2800 12100 - 12500 - 2600 - 3200 12000 - 13000
(A021-001661)

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 Must make adjustments with guide bar and chain provided with product.
 5. Chain saw, Engine cutter 9
Step 8:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.4 Verify final engine speed with
standard equipment
Engine Step 2:
warm-up Adjust L mixture Step 5:
needle Turn H mixture needle
Tool to Step 4:
Throttle Idle - WOT: to max. idle speed Turn L mixture CCW to confirm engine Step 7:
Limiter adjust Final Idle Final WOT
Model Carburetor H mixture L mixture Adjust Total *1 speed reduces Turn H mixture
cap/plug mixture needle CCW to range range
(Spec. code) (Parts No.) needle needle Screw (sec.) needle
(Table 1) needles set idle speed (r/min) (r/min)
(TAS) Step 3: Step 6: CW
(Table 2) (r/m)
Set idle speed Adjust H mixture needle
with TAS (r/m) to set WOT (r/m) *2

HDA-268A
CS-610 (37) C4 a 3/4 1 3/4 1 5 - 5 : 120 3600 2800 12100 - 12300 - 2600 - 3200 11800 - 12800
(A021-001661)
HDA-316
CS-620SX (33)(36) C4 a 7/8 1 7/8 1/2 5 - 5 : 120 3600 2800 12700 - 12900 - 2600 - 3100 12600 - 13400
(A021-004150)
CS-621SX (38) HDA-346
C4 a 1 1/2 1 7/8 3 5 - 5 : 120 3700 2900 12500 - 12700 - 2400 - 3500 12100 - 13200
Mixed two-stroke fuel (A021-005220)
CS-621SX (38) HDA-346
C4 a 1 1/2 1 7/8 3 5 - 5 : 120 3600 2800 12500 - 12700 - 2400 - 3500 12100 - 13200
Premixed alkylate fuel (A021-005220)
CS-6702 (36) HDA-203A
C4 a 3 1 7/8 2 1/2 5 - 5 : 120 3600 2700 12500 - 13500 - 2200 - 3200 12500 - 13500
CS-6703 (36) (A021-000292)
HDA-272A
CS-680 (36) C4 a 1 1/8 2 1/4 1/2 5 - 5 : 120 3600 2600 13000 - 13800 - 2300 - 2900 12900 - 13900
(A021-001782)
CS-8001 (36) HDA-153C
C4 a 3 3/8 2 3/8 2 10 - 5 : 120 3000 2500 11500 - 12500 - 2200 - 3000 11500 - 12500
CS-8002 (36) (123000-38833)
HDA-324
CS-8002 (36) C4 a 3 1/8 1 3/8 2 10 - 5 : 120 3000 2500 11500 - 12500 - 2200 - 3000 11500 - 12500
(A021-004240)

HDA-216
CSG-680 (36) C4 a 1 1/4 1 7/8 2 5 - 5 : 120 3450 2450 9000 - 10000 - 2200 - 2800 8500 - 10500
(A021-000730)

YZ0010
CS-7310SX (38) - d 1 5/8 1 1/2 3 5 - 10 : 120 3700 3000 12600 - 12800 - 2700 - 3400 12600 - 12800
(A021-005260)

CSG-7410ES 2800 2600 - 3000

CSG-7410ES/12 HAD-344
- d 3 1/2 2 2 1/2* 10 - 5 : 120 3700 - - -
(38) (A021-004950) Brand-new
Mixed two-stroke fuel Carburetor or Di- 3100 - 3400
aphragm : 3300

CSG-7410ES 2800
CSG-7410ES/12 HAD-344
- d 3 3/8 2 2 1/2* 10 - 5 : 120 3750 - - 2600 - 3000 -
(38) (A021-004950) Brand-new
Premixed alkylate fuel Carburetor or Di-
aphragm : 2800

--- Initial settings ---

H & L mixture needles: Turn H and L mixture needles CW until lightly seated, then turn both mixture needles CCW.
TAS: Turn screw CCW until its tip no longer touches the throttle plate. Then turn screw CW until its tip just comes into contact with the plate again. Finally, turn the screw CW for the respective number of rotations.
* Turn TAS clockwise until lightly seated. Then turn TAS counterclockwise.
*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 Must make adjustments with guide bar and chain provided with product.
 6. Trimmer/Brushcutter, Clearing saw 10

Table 1: Limiter cap / plug Table 2: Tool

C1 A259-000030 Fig. 1: Idle setting Fig. 2: WOT setting Fig. 3: WOT setting
a
Screwdriver 2 mm
C2 125329-09860
6000 14000 12000
Step6
Step2

C5 P005-001520 b

Engine speed

Engine speed
Engine speed
Step1
by TAS Step1
Step3 Step5
Screwdriver 2.5 mm Idle rich down 12000 10000
Step5
4000
Step6
C6 P005-001530 Step4
Step1

c H mixture needle adjustment

2000 L mixture needle adjustment 8000 H mixture needle adjustment

P1 A259-000000 D-shaped (S)

P2 P005-001270 d 2 1 0 2 1 0 2 1 0

D-shaped (L) Counterclockwise

= Richer
Clockwise
= Leaner
Counterclockwise
= Richer
Clockwise
= Leaner
Counterclockwise
= Richer
Clockwise
= Leaner
P5 A259-000060 Needle adjustment Needle adjustment Needle adjustment

Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)
GT-2150 (36) F4 (3.0):
C1U-K53B L : C2
GT-2150SI b Cut by shield 1 1/4 1 1/4 2 1/2 10 - 50: 180 3550 2750 7500 - 8000 - - 2300 - 3000 7500 - 8000
(125200-52436) H : C1
(36) knife
G137 (3.0):
RB-K87 Cut by shield - 7000 - 8000
GT-220ES (A021-001462 ) knife
P2 b 1 3/8 2 3/4 1 1/2 5 - 10: 180 3800 3000 - 10 - 30 2600 - 3400
(36)(37) RB-K93
(A021-001692) Other 7300 -

RB-K113 G137 (3.0): 130 6700 - 7700

GT-222ES (A021-003881) P2 1 1/8 3 7/8 7 3/4*
b 10 - 50: 180 4100 3000 - - 10 - 30 2600 - 3400
(37)(38) R09-001 P5 3/4 3 1/4 6 1/4*
(A091-000000) G137 (2.0): 150 7700 - 8700

G138 (3.0):
RB-K87 Cut by shield - 8000 - 9700
SRM-220ES (A021-001462 ) knife
P2 b 1 3/8 2 3/4 2 1/2 5 - 10: 180 3800 3000 - 10 - 30 2600 - 3400
(36)(37) RB-K93
(A021-001692) Other 8800 -

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 11
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)

RB-K113 G138 (3.0): 180 9000 - 10000

SRM-222ES (A021-003881) P2 1 1/8 3 7/8 7 3/4 *
b 10 - 50: 180 4100 3000 - - 10 - 30 2600 - 3400
(37)(38) R09-001 P5 3/4 3 1/4 6 1/4 *
(A091-000000) G138 (2.0): 200 9500 - 10500

SRM-235 F4 (3.0): 140 - 8400 - 9400

(37) RB-K93
P2 b 3/4 2 5/8 2 3/8 5 - 5: 120 3800 2900 - 10 - 20 2500 - 3300
SRM-235ES (A021-001692)
(37) Other 9100 -

SRM-236 F4 (3.0): 180 2300 - 8600 - 10000

(- 37013302) RB-K113 Inclease Turn out
P2 b 1 1/8 3 1/4 5 1/4* 10 - 50: 180 3700 - 2500 - 3500
SRM-236ES (A021-003881) 3000 by 3/8
(-37006656) Other by TAS 8000 -

F4 (3.0): 180
SF400 (2.4
- 8600 - 10000
SILENTWIST):
185
SRM-236
(37013303 -) SF400 (2.4
(38) RB-K113 BLACK Turn out
P2 b 1 1/8 3 1/4 5 1/4* 10 - 50: 180 4100 3000 - - 2500 - 3500 8200 - 9200
SRM-236ES (A021-003881) DIAMOND): by 3/8
(37006657 175
-)

Other 8000 -

F4 (3.0): 210
SF400 (2.4
- 9500 - 10500
SILENTWIST):
220
SRM-
RB-K113 SF400 (2.4 Turn out
236TES (37) P2 b 1 1/8 3 1/4 5 1/4* 10 - 50: 180 4100 3000 - 2500 - 3500
(A021-003881) BLACK by 3/8
(38) - 9300 - 10300
DIAMOND):
210

Other 8000 -

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 12
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)
SF400 (2.4
BLACK
- 8200 - 9200
DIAMOND):
SRM-237 RB-K113 175 Turn out
P2 b 1 1/8 3 1/4 5 1/4* 10 - 50: 180 4100 3000 - 2500 - 3500
(38) (A021-003881) by 3/8
Other 8000 -

SF400 (2.4
BLACK
- 9300 - 10300
SRM- DIAMOND):
RB-K113 210 Turn out
237TES P2 b 1 1/8 3 1/4 5 1/4* 10 - 50: 180 4100 3000 - 2500 - 3500
(A021-003881) by 3/8
(38)
Other 8000 -

SRM-2305
F4 (3.0):
(36) C1U-K53B L : C2
b Cut by shield 1 3/8 1 1/4 2 3/4 10 - 50: 180 3550 2750 8200 - 10000 - - 2400 - 3200 8200 - 10000
SRM-2305SI (125200-52436) H : C1
knife
(36)
F4 (3.0):
SRM-2306 RB-K87 Cut by shield 2700 - 8400 - 9400
SRM- (A021-001462 ) knife 2 3/8 1 1/2 3 1/4 Inclease
P2 b 5 - 5: 120 3500 - 20 - 50 2700 - 3100
2306ES RB-K93 3/4 2 5/8 2 3/8 2900
(37) (A021-001692) Other by TAS 9200 -

F4 (3.0): 140 - 8000 - 9600

SRM-240ES RB-K97
P2 b 1 1/4 2 3/4 2 1/2 10 - 50: 180 3800 3000 - 10 - 20 2500 - 3500
(37) (A021-003220)
Other 8000 -

SRM-250
F4 (3.0):
(36) C1U-K53B L : C2
b Cut by shield 1 3/8 1 1/4 2 5/8 10 - 50: 180 3300 2650 9000 - 9500 - - 2300 - 3500 9000 - 9500
SRM-250SI (125200-52436) H : C1
knife
(36)
SRM-2655
Z5 (3.0):
(36) WYJ-192B 8500
P1 b Cut by shield #37** 12 1/2* 2 1/2 10 - 50: 180 3500 2700 - - - 2400 - 3000
SRM-2655SI (123000-57732) Minimum
knife
(36)

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 13
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)

F4 (3.0): 180 - 8900 - 9900

SRM-265 RB-K89
(37)(38) (A021-001532)
P2 b 1 1/2 1 1/2 3 1/4 5 - 5: 120 3700 2900 - 10 2600 - 3200
SRM-265ES RB-K94
(37) (A021-001742)
Other 8500 -

Z5 (3.0): 265 - 10000 - 11000

SRM-
RB-K94
265TES P2 b 1 1/2 1 1/2 3 1/4 5 - 5: 120 3700 2900 - 10 2600 - 3200
(A021-001742)
(37)
Other 8500 -

Rapid-Loader
- 9300 - 10300
25 (2.4): 200
SRM-267 RB-K94
P2 b 1 1/2 1 1/2 3 1/4 5 - 5: 120 3700 2900 - 10 2600 - 3200
(38) (A021-001742)
Other 8500 -

F4 (3.0): 190
SF400 (2.4
- 9000 - 10000
SILENTWIST):
200

SF400 (2.4
SRM-
WYG-9 BLACK
2620ES (37) - c 3 7 1/4* 7 3/4* 10 - 50: 180 4000 3000 - - 20 - 30 2700 - 3500 8900 - 9900
(A021-004600) DIAMOND):
(38)
190

Other 8500 -

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 14
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)
Z5 (3.0): 285
SF400 (2.4
- 10400 - 11800
SILENTWIST):
295
SRM- SF400 (2.4
WYG-9
2620TES - c BLACK 3 7 1/4* 7 3/4* 10 - 50: 180 4000 3000 - 20 - 30 2700 - 3500
(A021-004600) - 10300 - 11700
(37)(38) DIAMOND):
285

Other 8500 -

SF400 (2.4
BLACK
- 8900 - 9900
SRM- DIAMOND):
WYG-9
2621ES - c 190 3 7 1/4* 7 3/4* 10 - 50: 180 4000 3000 - 20 - 30 2700 - 3500
(A021-004600)
(38)
Other 8500 -

SF400 (2.4
BLACK
- 10300 - 11700
SRM- DIAMOND):
WYG-9 285
2621TES - c 3 7 1/4* 7 3/4* 10 - 50: 180 4000 3000 - 20 - 30 2700 - 3500
(A021-004600)
(38)
Other 8500 -

F4 (3.0): 165 - 9000 - 9800

SRM-300ES WYK-233A
P1 b 3 1/4 12 1/8* 9 3/4* 5 - 5: 120 3500 2700 - 100 2500 - 3100
(37)(38) (A021-001341)
Other 8500 -

SRM- Z5 (3.0): 220 - 10300 - 11300

WYK-233A
300TES (37) P1 b 3 1/4 12 1/8* 9 3/4* 5 - 5: 120 3500 2700 - 100 2500 - 3100
(A021-001341)
(38) Other 8500 -

Rapid-Loader
- 10300 - 11300
SRM- 25 (2.4): 300
WYK-233A
301TES P1 b 3 1/4 12 1/8* 9 3/4* 5 - 5: 120 3500 2700 - 100 2500 - 3100
(A021-001341)
(38)
Other 8500 -

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 15
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)
SF400 (2.4
SILENTWIST): - 9900 - 10500
245
SRM- SF400 (2.4
WYG-11
3020TES - c BLACK DIA- 3 5/8 10 7/8* 9 7/8* 10 - 50: 180 4000 2900 - - 30 - 50 2700 - 3200 9800 - 10400
(A021-004830)
(37)(38) MOND): 230

Other 9000 -

SF400 (2.4
SRM- BLACK DIA- - 9800 - 10400
WYG-11 MOND): 230
3021TES - c 3 5/8 10 7/8* 9 7/8* 10 - 50: 180 4000 2900 - 30 - 50 2700 - 3200
(A021-004830)
(38)
Other 9000 -

Z5 (3.0):
SRM-330ES WYJ-312A 9500
P1 b Cut by shield #44* 13* 4 1/2 10 - 50: 180 3550 2650 - - - 2200 - 3400
(36) (A021-000421) Minimum
knife

Z5 (3.0): 175 - 8500 - 9500

SRM-335ES WYK-283
P1 b 3 1/8 11 1/2* 3 1/4 5 - 5: 120 3600 2800 - 80 - 100 2500 - 3200
(37) (A021-001550)
Other 8500 -

SRM- Z5 (3.0): 270 - 10000 - 11000

WYK-283
335TES P1 b 3 1/8 11 1/2* 3 1/4 5 - 5: 120 3600 2800 - 100 - 120 2500 - 3200
(A021-001550)
(37) Other 8500 -

Z5 (3.0):
SRM-350ES WYJ-373B 9500
P1 b Cut by shield #38** 13* 4 1/2 10 - 50: 180 3550 2650 - - - 2300 - 3300
(36) (A021-000932) Minimum
knife
Z5 (3.0):
Cut by shield - 8300 - 8800
SRM-360SL DPR11-1H knife
- a 1 1/2 - 2 1/2 10 - 50: 180 2750 - - 400 2500 - 3400
(36) (124200-64731)
Other 7000 -

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 16
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)

Z5 (3.0): 230 2700 9000 9900 - 10300

SRM-3610T RB-110137B Inclease Turn out
P2 b 1 1/4 1 3/4 9 3/4* 10 - 50: 180 3500 - 2600 - 3300
(37)(38) (A021-004820) 2900 by 5/8
Other by TAS 9000 -

NOTE: Confirm maximum WOT speed just before the WOT speed drops, turning H mixture needle clockwise. The maximum speed is approximately 9000 r/min.

Z5 (3.0): 230 2700 9000 9900 - 10300

SRM-3611T RB-110137B Inclease Turn out
P2 b 1 1/4 1 3/4 9 3/4* 10 - 50: 180 3500 - 2600 - 3300
(38) (A021-004820) 2900 by 5/8
Other by TAS 9000 -

NOTE: Confirm maximum WOT speed just before the WOT speed drops, turning H mixture needle clockwise. The maximum speed is approximately 9000 r/min.

Z5 (3.0):
SRM-4000 WYK-134C 9500
P1 b Cut by shield #56** 12* 4 10 - 50: 180 3500 2500 - - - 2200 - 2900
(36) (A021-000282) Minimum
knife
Z5 (3.0):
SRM-4000 WYK-218
P1 b Cut by shield 3 3/4 12* 4 10 - 50: 180 3500 2500 9500 - 10500 - - 2200 - 2900 9500 - 10500
(36) (A021-001050)
knife
Z5 (3.0):
SRM-4000 WYK-226
P1 b Cut by shield 4 12 1/4* 1 3/8 10 - 50: 180 3500 2700 9000 - 10000 - - 2500 - 2900 9000 - 10000
(36) (A021-001170)
knife
Z5 (3.0):
SRM-4000 WYK-226A
P1 b Cut by shield 3 3/8 12 1/2* 3/4 10 - 50: 180 3500 2500 9000 - 10000 - - 2300 - 2700 9000 - 10000
(36) (A021-001172)
knife

DS-5 (3.0): 225 - 9000 - 10000

SRM-410ES WYK-226A
P1 b 4 12 1/4* 2 3/8 10 - 20: 180 3500 2500 - 120 2300 - 2700
(36) (A021-001172)
Other 8000 -

WT-1046 DS-5 (3.0): 190 - 9500 - 10500

SRM-420ES (A021-003840)
- d 3 2 3/8 2 1/8 10 - 50: 180 3550 2750 - 120 2400 - 3200
(37)(38) WT-1170
(A021-004610) Other 8500 -

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 17
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)

DS-5 (3.0): 190 - 9500 - 10500

SRM-420ES- WT-1170 Rapid-Loader

- d 3 2 3/8 2 1/8 10 - 50: 180 3550 2750 - - 120 2400 - 3200 10200 - 11400
LW (37)(38) (A021-004610) 35 (2.7): 215

Other 8500 -

B6 (3.0): 240 - 9800 - 11000

WT-1046
SRM-
(A021-003840)
420TES (37) - d 3 2 3/8 2 1/8 10 - 50: 180 3550 2750 - 120 2400 - 3200
WT-1170
(38)
(A021-004610)
Other 8500 -

WYK-216
DS-5 (3.0):
SRM-5000 (A021-001030) 4 12* 4 1/2
P1 b Cut by shield 10 - 50: 180 3400 2500 9700 - 10300 - - 2200 - 2800 9700 - 10300
(36) WYK-227 4 12 1/2* 3 3/4
knife
(A021-001160)

DS-5 (3.0): 225 - 9500 - 11000

SRM-510ES WYK-341
P1 b 3 3/4 12* 1 1/2 10 - 20: 120 3500 2750 - 120 2500 - 3000
(33)(36) (A021-001860)
Other 8000 -

DS-5 (3.0): 210 - 10500 - 11100

SRM-520ES WT-1096
- d 2 3/4 2 2 1/8 10 - 50: 180 3600 2800 - 120 2400 - 3300
(37)(38) (A021-004220)
Other 9000 -

SRM-580 C3M-K80 L : C6 Metal blade:

a 1/2 1 1/4 1 10 - 20: 120 3250 2600 11300 - 12300 - - 2300 - 2800 11300 - 12300
(36) (A021-000953) H : C5 255
F4 (3.0):
SRMF-250 WYL-214A 9000
- c Cut by shield #36.5** 8* 7/8 30 - 60: 90 3300 3000 - - - 2600 - 3300
(37) (A021-002740) Minimum
knife
Z5 (3.0):
SRMF-340 WYL-255 9000
- c Cut by shield #41** 7 1/2* 1 5 - 10: 120 3300 2900 - - - 2600 - 3300
(37) (A021-002510) Minimum
knife

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 18
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)
B6 (3.0):
CLS-5000 WYK-216
P1 b Cut by shield 4 12* 4 1/2 10 - 20: 120 3400 2450 9700 - 10300 - - 2200 - 2800 9700 - 10300
(36) (A021-001030])
knife
B6 (3.0):
CLS-5010 WYK-227
P1 b Cut by shield 4 12 1/2* 3 3/4 10 - 20: 120 3400 2450 9700 - 10300 - - 2000 - 2700 9700 - 10300
(36) (A021-001160)
knife
B6 (3.0):
BCLS-510ES WYK-341
P1 b Cut by shield 3 3/8 13 1/2* 3/4 10 - 20: 120 3500 2500 9000 - 10000 - - 2300 - 2700 9000 - 10000
(36) (A021-001860)
knife
CLS-5800
(36)
B6 (3.0):
CLS-5810 C3M-K80 L : C6
a Cut by shield 1/2 1 5/8 3 3/8 10 - 50: 180 3250 2600 10000 - 12000 - - 2300 - 2800 10000 - 12000
(36) (A021-000953) H : C5
knife
BCLS-580
(36)

B6 (3.0): 197 - 9700 - 10700

BCLS-520ES WT-1096
- d 2 3/4 2 2 1/8 10 - 50: 180 3600 2800 - 120 2400 - 3300
(38) (A021-004220)
Other 9000 -

RM-4000
Z5 (3.0):
(36) WYK-134C 9500
P1 b Cut by shield #56** 12* 4 10 - 50: 180 3500 2500 - - - 2200 - 2900
RM-4000SI (A021-000282) Minimum
knife
(36)
RM-4000
Z5 (3.0):
(36) WYK-218
P1 b Cut by shield 3 3/4 12* 4 10 - 50: 180 3500 2500 9500 - 10500 - - 2200 - 2900 9500 - 10500
RM-4000SI (A021-001050)
knife
(36)
RM-4000
Z5 (3.0):
(36) WYK-226
P1 b Cut by shield 4 12 1/4* 1 3/8 10 - 50: 180 3500 2700 9200 - 9800 - - 2500 - 2900 9200 - 9800
RM-4000SI (A021-001170)
knife
(36)
RM-4000
Z5 (3.0):
(36) WYK-226A
P1 b Cut by shield 3 3/8 12 1/2* 3/4 10 - 50: 180 3500 2500 9000 - 10000 - - 2300 - 2700 9000 - 10000
RM-4000SI (A021-001172)
knife
(36)

Z5 (3.0): 225 - 9000 - 10000

RM-410ES WYK-226A
P1 b 4 12 1/4* 2 3/8 10 - 20: 180 3500 2500 - 120 2300 - 2700
(36) (A021-001172)
Other 7500 -

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 6. Trimmer/Brushcutter, Clearing saw 19
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5: Step 5:
Engine Load Adjust L Turn H mix- Adjust H mixture needle
Engine mixture ture needle to max. WOT speed
warm-up Step 4:
Nylon head needle CCW to con-
Turn L
Limiter Tool to (Line diam- to max. idle firm engine Step 6:
Throttle Idle - WOT: speed *1 mixture Step 5': Final WOT
cap/ adjust eter): Line H L speed re- Turn H mix- Final Idle
Model Carburetor Adjust Total needle Adjust range
plug mixture Shield length mixture mixture duces ture needle range
(Spec. code) (Parts No.) Screw (sec.) CCW to nylon line with shield
(Table needles or needle needle Step 3: CCW to re- (r/min)
(TAS) set idle lengths to (r/min)
1) (Table 2) Blade diam- Set idle Step 6: duce WOT
speed
eter speed Adjust H mix- obtain the speed by
(r/m) following
(mm) with TAS ture needle the follow-
(r/m) to set WOT speed
ing speed
(r/m)
Z5 (3.0):
RM-5000 WYK-173A 9500
P1 b Cut by shield #57** 12* 4 10 - 50: 180 3400 2500 - - - 2300 - 2700
(36) (A021-000591) Minimum
knife
WYK-216
Z5 (3.0):
RM-5000 (A021-001030) 4 12* 4 1/2
P1 b Cut by shield 10 - 50: 180 3400 2500 9500 - 10300 - - 2300 - 2700 9500 - 10300
(36) WYK-227 4 12 1/2* 3 3/4
knife
(A021-001160)
Z5 (3.0):
RM-510ES WYK-341
P1 b Cut by shield 3 3/8 13 1/2* 3/4 10 - 20: 120 3500 2500 9000 - 10000 - - 2300 - 2700 9000 - 10000
(33)(36) (A021-001860)
knife

Z5 (3.0): 220 - 10400 - 11400

RM-520ES WT-1096
- d 2 7/8 1 7/8 2 1/4 10 - 50: 180 3600 2800 - 120 2400 - 3300
(37)(38) (A021-004220)
Other 9000 -

--- Initial setting ---

H & L mixture needles: Turn H and L mixture needles CW until lightly seated, then turn both mixture needles CCW.
* Turn L mixture needle counterclockwise until a clicking sound is heard. Then, screw the needle CW for the respective number of rotations.
** Size of fixed main jet - there is no H needle adjustment.
TAS: Turn screw CCW until its tip no longer touches the throttle plate. Then turn screw CW until its tip just comes into contact with the plate again. Finally, turn the screw CW for the respective number of rotations.
* Turn TAS CW until its head touches boss. Then turn TAS CCW.
*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 7. Hedge trimmer 20

Table 1: Limiter cap / plug Table 2: Tool

C1 A259-000030 Fig. 1: Idle setting Fig. 2: WOT setting Fig. 3: WOT setting
a
Screwdriver 2 mm
C2 125329-09860
6000 14000 12000
Step6
Step2

C3 125329-39030 b

Engine speed

Engine speed
Engine speed
Step1
by TAS Step1
Step3 Step5
Screwdriver 2.5 mm Idle rich down 12000 10000
Step5
4000
Step6
C4 P003-000010 Step4
Step1

H mixture needle adjustment

2000 L mixture needle adjustment 8000 H mixture needle adjustment

P1 A259-000000

P2 P005-001270 2 1 0 2 1 0 2 1 0

Counterclockwise Clockwise Counterclockwise Clockwise Counterclockwise Clockwise

= Richer = Leaner = Richer = Leaner = Richer = Leaner
Needle adjustment Needle adjustment Needle adjustment

Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed with
standard equipment
Step 5:
Engine Step 5:
Step 2: Adjust H mixture
warm-up Turn H mixture needle
Adjust L mixture needle to max.
CCW to confirm
Tool to needle Step 4: WOT speed
Throttle Idle - WOT: engine
Limiter adjust H L to max. idle speed *1 Turn L mixture
Model Carburetor Adjust Total speed reduces Final Idle range Final WOT range
cap/plug mixture mixture mixture needle CCW to Step 6:
(Spec. code) (Parts No.) Screw (sec.) (r/min) (r/min)
(Table 1) needles needle needle Step 3: set idle speed Turn H mixture
(TAS) Step 6:
(Table 2) Set idle speed (r/m) needle CCW to
Adjust H mixture
with TAS (r/m) reduce WOT speed
needle
by the following
to set WOT (r/m)
speed
C1U-K51 L : C2
HC-1500 (36) b 1 3/4 1 3/4 3 7/8 10 - 50 : 180 3500 3000 9800 - 10800 - 2700 - 3300 9800 - 10800
(125200-05967) H : C1
HCR-1500 (36) C1U-K51 L : C2
b 1 3/4 1 3/4 3 7/8 10 - 50 : 180 3500 3000 9800 - 10800 - 2700 - 3300 9800 - 10800
HCR-1500SI (36) (125200-05967) H : C1
C1U-K54A L : C2
HCR-1510 (36) b 1 1/2 1 1/2 2 3/4 10 - 10 : 180 3800 2800 - 1/4 2400 - 3200 7900 - 8500
(125200-13128) H : C3
2700
C1U-K51 L : C2
HC-1600 (36) b 1 3/4 1 3/4 3 10 - 50 : 180 3500 Inclease 3000 10000 - 11500 - 2700 - 3300 10000 - 11500
(125200-05967) H : C1
by TAS
RB-K86
(A021-001450)
3100
HCR-161ES (36) RB-K92A
P2 b 1 1/8 2 3/4 3 10 - 10 : 180 4600 Inclease 3300 - 200 3000 - 3600 10500 - 12000
HCR-171ES (36) (A021-001672)
by TAS
RB-K115
(A021-004081)
RB-K91A
HC-155ES (36) P2 b 1 1/8 2 1/2 2 3/4 10 - 10 : 180 4650 3300 - 200 3000 - 3600 10500 - 12000
(A021-001613)
RB-K92A
HC-156 (37)(38) P2 b 1 1/8 2 8 1/4* 10 - 10 : 180 4600 3300 - 1/4 2900 - 3700 10500 - 11800
(A021-001673)
HC-1501
RB-K92A
HCR-1501 (37) P2 b 1 1/8 2 8 1/4* 10 - 10 : 180 4600 3300 - 1/4 2900 - 3700 10500 - 11800
(A021-001673)
(38)

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 7. Hedge trimmer 21
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed with
standard equipment
Step 5:
Engine Step 5:
Step 2: Adjust H mixture
warm-up Turn H mixture needle
Adjust L mixture needle to max.
CCW to confirm
Tool to needle Step 4: WOT speed
Throttle Idle - WOT: engine
Limiter adjust H L to max. idle speed *1 Turn L mixture
Model Carburetor Adjust Total speed reduces Final Idle range Final WOT range
cap/plug mixture mixture mixture needle CCW to Step 6:
(Spec. code) (Parts No.) Screw (sec.) (r/min) (r/min)
(Table 1) needles needle needle Step 3: set idle speed Turn H mixture
(TAS) Step 6:
(Table 2) Set idle speed (r/m) needle CCW to
Adjust H mixture
with TAS (r/m) reduce WOT speed
needle
by the following
to set WOT (r/m)
speed
HCR-165ES
RB-K119
HCR-185ES (37) P2 b 1/2 2 1/2 7 1/2* 0 - 300 : 300 4100 3300 - 150 2900 - 3600 10000 - 11000
(A021-004670)
(38)
HC-2020
HC-2020R RB-Z011/67A
P2 b 1 1/8 3 1/4 7 5/8* 10 - 50 : 240 4100 3300 - 130 - 190 2900 - 3700 10000 - 11000
HC-2320 (A021-004900)
(38)
2700
HC-2400 (36) C1U-K51 L : C2
b 1 3/4 1 3/4 3 1/8 10 - 50 : 180 3500 Inclease 3000 10500 - 12000 - 2700 - 3300 10500 - 12000
HC-2410 (36) (125200-05967) H : C1
by TAS
HC-2810ESR (37) RB-K119
P2 b 7/8 3 7 1/8* 0 - 120 : 120 4100 3300 - 100 - 150 2900 - 3700 10000 - 12000
(38) (A021-004670)
HCS-2810ES
HCS-3210ES RB-K119
P2 b 7/8 3 7 1/8* 0 - 120 : 120 4100 3300 - 100 - 150 2900 - 3700 10000 - 12000
HCS-3810ES (A021-004670)
(37)(38)
HC-30ES (36)
WYL-192A L : P1 8000
HC-30ESW (36) b #35** 12* 7 3/4 10 - 10 : 180 3900 3000 - - 2700 - 3300
(A021-000692) H : Nil Minimum
HC-40ES (36)
HC-331ES (36) RB-K91A
P2 b 1 1/2 2 1/2 2 3/4 10 - 10 : 180 4700 3000 - 200 2700 - 3300 10500 - 11700
HC-341ES (36) (A021-001613)

--- Initial setting ---

H & L mixture needles: Turn H and L mixture needles CW until lightly seated, then turn both mixture needles CCW.
* Turn L mixture needle counterclockwise until a clicking sound is heard. Then, screw the needle CW for the respective number of rotations.
** Size of fixed main jet - there is no H needle adjustment.
TAS: Turn screw CCW until its tip no longer touches the throttle plate. Then turn screw CW until its tip just comes into contact with the plate again. Finally, turn the screw CW for the respective number of rotations.
* Turn TAS CW until its head touches boss. Then turn TAS CCW.
*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
 8. Shafted hedge trimmer, Pro-attachment series, Pruner,
Engine drill, Earth auger 22

Table 1: Limiter cap / plug Table 2: Tool

C4 P003-000010
a Fig. 1: Idle setting Fig. 2: WOT setting Fig. 3: WOT setting
Screwdriver 2 mm
P1 A259-000000
6000 14000 12000
Step6
Step2

P2 P005-001270 b

Engine speed

Engine speed
Engine speed
Step1
by TAS Step1
Step3 Step5
Screwdriver 2.5 mm Idle rich down 12000 10000
Step5
4000
Step1 Step6
Step4

c H mixture needle adjustment

2000 L mixture needle adjustment 8000 H mixture needle adjustment

D-shaped (S)

2 1 0 2 1 0 2 1 0

Counterclockwise Clockwise Counterclockwise Clockwise Counterclockwise Clockwise

= Richer = Leaner = Richer = Leaner = Richer = Leaner
Needle adjustment Needle adjustment Needle adjustment

Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5:
Step 5:
Adjust L Adjust H mixture needle to
Engine Turn H mixture
Engine Load mixture max. WOT speed
warm-up Step 4: needle
needle
Turn L mix- CCW to con-
Tool to Nylon head to max. idle Step 6:
Throttle Idle - WOT: ture firm engine
Limiter adjust (Line diameter): H L speed *1 Turn H mix- Final Idle Final WOT
Model Carburetor Shield Adjust Total needle CCW speed reduces Step 5':
cap/plug mixture Line length mixture mixture Adjust nylon ture needle range range
(Spec. code) (Parts No.) *2 Screw (sec.) to
(Table 1) needles or needle needle Step 3: line lengths CCW to (r/min) (r/min)
(TAS) set idle Step 6:
(Table 2) Blade diameter Set idle
speed Adjust H mix- to obtain the reduce WOT
(mm) speed following speed by the
(r/m) ture needle
with TAS speed following
to set WOT
(r/m) speed
(r/m)

RB-K75
HCAS-2200 (A021-000740)
P2 b - - 2 2 2 1/2 5 - 5 : 120 3500 2900 - - 100 2700 - 3200 9500 - 11500
(36) RB-K87
(A021-001462)
HCAS-235ES RB-K93
P2 b - - 3/4 2 5/8 2 3/8 5 - 5 : 120 4000 3000 - - 1/2 2500 - 3500 10000 - 11200
(37) (A021-001692)
HCAS-235ES- RB-K93
P2 b - - 3/4 2 5/8 2 3/8 5 - 5 : 120 4000 3000 - - 1/2 2500 - 3500 10000 - 11200
LW (37) (A021-001692)
HCA-236ES-
LW RB-K113
P2 b - - 1 5/8 3 3/4 5 1/2 10 - 50 : 180 4300 3000 - - 3/8 2500 - 3500 10500 - 11700
HCAS-236ES- (A021-003881)
LW (37)(38)
WT-424C
HCA-2400 (36) C4 a - - 3 1/4 2 1/4 1 1/2 5 - 5 : 120 3450 2700 9500 - 10500 - - 2400 - 3200 9500 - 10500
(123000-52133)
WT-424C
HCA-2500 (36) C4 a - - 3 1/4 2 1/4 1 1/2 5 - 5 : 120 3450 2700 9500 - 10500 - - 2400 - 3200 9500 - 10500
(123000-52133)

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 When Load adapter is shown, install Load adapter 91156.
 8. Shafted hedge trimmer, Pro-attachment series, Pruner,
Engine drill, Earth auger 23
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5:
Step 5:
Adjust L Adjust H mixture needle to
Engine Turn H mixture
Engine Load mixture max. WOT speed
warm-up Step 4: needle
needle
Turn L mix- CCW to con-
Tool to Nylon head to max. idle Step 6:
Throttle Idle - WOT: ture firm engine
Limiter adjust (Line diameter): H L speed *1 Turn H mix- Final Idle Final WOT
Model Carburetor Shield Adjust Total needle CCW speed reduces Step 5':
cap/plug mixture Line length mixture mixture Adjust nylon ture needle range range
(Spec. code) (Parts No.) *2 Screw (sec.) to
(Table 1) needles or needle needle Step 3: line lengths CCW to (r/min) (r/min)
(TAS) set idle Step 6:
(Table 2) Blade diameter Set idle
speed Adjust H mix- to obtain the reduce WOT
(mm) speed following speed by the
(r/m) ture needle
with TAS speed following
to set WOT
(r/m) speed
(r/m)

HCA-2620ES- F4 (3.0): 190

-
HD SF400 (2.4): 200
WYG-9
HCAS-2620ES- - c 3 7 1/4* 7 3/4* 10 - 50 : 180 4000 3000 - 20 - 30 2700 - 3500 10900 - 11900
(A021-004600)
HD (37)(38) Other 8500

NOTE: Before adjusting carburetor, install ECHO PAS-TRIMMER attachment 999442-00840 or Trimmer attachment MTA-TB. In the step7, remove the attachment and reinstall standard equipment.
HCA-265ES RB-K89
P2 b - - 1 1/2 2 7* 5 - 5 : 120 3700 2900 - - 10 2600 - 3300 10300 - 11300
(36) (A021-001532)
HCA-265ES RB-K94
P2 b - - 1 1/2 2 7* 5 - 5 : 120 3700 2900 - - 10 2600 - 3300 10300 - 11300
(37) (A021-001742)
HCA-265ES-
LW RB-K94
P2 b - - 1 1/2 2 7* 5 - 5 : 120 3700 2900 - - 10 2600 - 3300 10300 - 11300
HCA-265ES- (A021-001742)
HD (37)(38)
SHC-2400 (36)
WT-424C
SHC-2400SI C4 a - - 3 1/4 2 1/4 1 1/2 5 - 5 : 120 3450 2700 9500 - 10500 - - 2400 - 3200 9500 - 10500
(123000-52133)
(36)
F4 (3.0): 190
SF400 (2.4
- 9000 - 10000
SILENTWIST):
200
PAS-2620ES
SF400 (2.4
(37)(38) WYG-9
- c BLACK DIA- 3 7 1/4* 7 3/4* 10 - 50 : 180 4000 3000 - - 20 - 30 2700 - 3500 8900 - 9900
Trimmer MTA- (A021-004600)
MOND): 190
TB

Other 8500 -

PAS-2620ES
(37)(38)
WYG-9
Hedge Trimmer - c NOTE: Install Trimmer attachment MTA-TB and follow the above adjustment steps. 2700 - 3500 10600 - 11900
(A021-004600)
MTA-AH-HD
MTA-AHS-HD
PAS-2620ES
(37)(38) WYG-9
- c NOTE: Install Trimmer attachment MTA-TB and follow the above adjustment steps. 2700 - 3500 10600 - 11900
Tiller/Cultivator (A021-004600)
MTA-TC

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 When Load adapter is shown, install Load adapter 91156.
 8. Shafted hedge trimmer, Pro-attachment series, Pruner,
Engine drill, Earth auger 24
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5:
Step 5:
Adjust L Adjust H mixture needle to
Engine Turn H mixture
Engine Load mixture max. WOT speed
warm-up Step 4: needle
needle
Turn L mix- CCW to con-
Tool to Nylon head to max. idle Step 6:
Throttle Idle - WOT: ture firm engine
Limiter adjust (Line diameter): H L speed *1 Turn H mix- Final Idle Final WOT
Model Carburetor Shield Adjust Total needle CCW speed reduces Step 5':
cap/plug mixture Line length mixture mixture Adjust nylon ture needle range range
(Spec. code) (Parts No.) *2 Screw (sec.) to
(Table 1) needles or needle needle Step 3: line lengths CCW to (r/min) (r/min)
(TAS) set idle Step 6:
(Table 2) Blade diameter Set idle
speed Adjust H mix- to obtain the reduce WOT
(mm) speed following speed by the
(r/m) ture needle
with TAS speed following
to set WOT
(r/m) speed
(r/m)

PAS-2620ES
(37)(38) WYG-9
- c NOTE: Install Trimmer attachment MTA-TB and follow the above adjustment steps. 2700 - 3500 10600 - 11900
Pro Sweep (A021-004600)
MTA-PS
PAS-2620ES
(37)(38) WYG-9
- c NOTE: Install Trimmer attachment MTA-TB and follow the above adjustment steps. 2700 - 3500 10600 - 11900
Power Pruner (A021-004600)
MTA-PP/E
PAS-2620ES
(37)(38) WYG-9
- c NOTE: Install Trimmer attachment MTA-TB and follow the above adjustment steps. 2700 - 3500 10600 - 11900
Edger (A021-004600)
MTA-LE/E
PAS-2620ES
(37)(38) WYG-9
- c NOTE: Install Trimmer attachment MTA-TB and follow the above adjustment steps. 2700 - 3500 8900 - 9500
Blower (A021-004600)
MTA-PB

PAS-265ES F4 (3.0): 180 - 9400 - 10400

RB-K89
(37)
(A021-001532)
Trimmer P2 b 1 1/2 2 7* 5 - 5 : 120 3700 2900 - 10 2600 - 3200
RB-K94
(999442-
(A021-001742) Other 8500 -
00840)

PAS-265ES
RB-K89
(37) Metal blade
(A021-001532)
Brushcutter P2 b NOTE: Install Trimmer attachment (999442-00840) and follow the above adjustment steps. 2600 - 3200 255:
RB-K94
(999442- 10200 - 11200
(A021-001742)
00800)
PAS-265ES
RB-K89
(37)
(A021-001532)
ProSweep P2 b NOTE: Install Trimmer attachment (999442-00840) and follow the above adjustment steps. 2600 - 3200 10400 - 11400
RB-K94
(999442-
(A021-001742)
00553)
PAS-265ES
RB-K89
(37)
(A021-001532)
Blower P2 b NOTE: Install Trimmer attachment (999442-00840) and follow the above adjustment steps. 2600 - 3200 8550 - 9050
RB-K94
(999442-
(A021-001742)
00890)

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 When Load adapter is shown, install Load adapter 91156.
 8. Shafted hedge trimmer, Pro-attachment series, Pruner,
Engine drill, Earth auger 25
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5:
Step 5:
Adjust L Adjust H mixture needle to
Engine Turn H mixture
Engine Load mixture max. WOT speed
warm-up Step 4: needle
needle
Turn L mix- CCW to con-
Tool to Nylon head to max. idle Step 6:
Throttle Idle - WOT: ture firm engine
Limiter adjust (Line diameter): H L speed *1 Turn H mix- Final Idle Final WOT
Model Carburetor Shield Adjust Total needle CCW speed reduces Step 5':
cap/plug mixture Line length mixture mixture Adjust nylon ture needle range range
(Spec. code) (Parts No.) *2 Screw (sec.) to
(Table 1) needles or needle needle Step 3: line lengths CCW to (r/min) (r/min)
(TAS) set idle Step 6:
(Table 2) Blade diameter Set idle
speed Adjust H mix- to obtain the reduce WOT
(mm) speed following speed by the
(r/m) ture needle
with TAS speed following
to set WOT
(r/m) speed
(r/m)

PAS-265ES
RB-K89
(37)
(A021-001532)
Cultivator P2 b NOTE: Install Trimmer attachment (999442-00840) and follow the above adjustment steps. 2600 - 3200 10400 - 11400
RB-K94
(999442-
(A021-001742)
00813)
PAS-265ES
RB-K89
(37)
(A021-001532)
Edger P2 b NOTE: Install Trimmer attachment (999442-00840) and follow the above adjustment steps. 2600 - 3200 10400 - 11400
RB-K94
(999442-
(A021-001742)
00875)
PAS-265ES
RB-K89
(37)
(A021-001532)
Power Pruner P2 b NOTE: Install Trimmer attachment (999442-00840) and follow the above adjustment steps. 2600 - 3200 10400 - 11400
RB-K94
(999442-
(A021-001742)
00832)
PAS-265ES RB-K89
(37) (A021-001532)
P2 b NOTE: Install Trimmer attachment (999442-00840) and follow the above adjustment steps. 2600 - 3200 10300 - 11300
Hedge Trimmer RB-K94
(HCAA-2401A) (A021-001742)
PAS-265ES
RB-K89
(37)
(A021-001532)
Hedge Trimmer P2 b NOTE: Install Trimmer attachment (999442-00840) and follow the above adjustment steps. 2600 - 3200 10400 - 11400
RB-K94
(999442-
(A021-001742)
00885)
PAS-2400 (36)
Trimmer WT-424C
C4 a F4 (3.0): 180 3 1/4 2 1/4 2 1/8 5 - 5 : 120 3450 2700 - - 10 - 20 2400 - 3200 7000 - 10000
(999442- (123000-52133)
00840)

SRM-235ES fan
- -
cover and shaft
PPF-235ES RB-K93
P2 b 3/4 2 5/8 2 3/8 5 - 5 : 120 3800 2900 - 1/2 2500 - 3300 10400 - 11400
(37) (A021-001692)
(2.4 dia.): 210 8250

10" guide bar

- -
and saw chain
PPF-236ES RB-K113
P2 b 1 5/8 3 3/4 5 1/2 10 - 50 : 180 4300 3000 - 3/8 2500 - 3500 10400 - 11400
(37)(38) (A021-003881)
(2.4 dia.): 210 8000

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 When Load adapter is shown, install Load adapter 91156.
 8. Shafted hedge trimmer, Pro-attachment series, Pruner,
Engine drill, Earth auger 26
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5:
Step 5:
Adjust L Adjust H mixture needle to
Engine Turn H mixture
Engine Load mixture max. WOT speed
warm-up Step 4: needle
needle
Turn L mix- CCW to con-
Tool to Nylon head to max. idle Step 6:
Throttle Idle - WOT: ture firm engine
Limiter adjust (Line diameter): H L speed *1 Turn H mix- Final Idle Final WOT
Model Carburetor Shield Adjust Total needle CCW speed reduces Step 5':
cap/plug mixture Line length mixture mixture Adjust nylon ture needle range range
(Spec. code) (Parts No.) *2 Screw (sec.) to
(Table 1) needles or needle needle Step 3: line lengths CCW to (r/min) (r/min)
(TAS) set idle Step 6:
(Table 2) Blade diameter Set idle
speed Adjust H mix- to obtain the reduce WOT
(mm) speed following speed by the
(r/m) ture needle
with TAS speed following
to set WOT
(r/m) speed
(r/m)

12” guide bar and

- -
PPF-300ES WYK-233A saw chain
P1 b 3 1/8 13 1/4* 9 5/8* 5 - 5 : 120 3500 2700 - 20 - 40 2500 - 3000 10400 - 11400
(37) (A021-001340)
(2.4 dia.): 210 8500

RB-K75
PPF-2100 (36) (A021-000740)
P2 b - - 1 1/2 1 1/2 2 3/8 10 - 50 : 180 3500 2700 - - 300 2400 - 3200 8500 - 10500
(37) RB-K87
(A021-001462)
RB-K75
PPT-2100 (36) (A021-000740)
P2 b - - 1 1/2 1 1/2 2 1/2 10 - 50 : 180 3500 2700 - - 300 2400 - 3200 8500 - 10500
(37) RB-K87
(A021-001462)

SRM-235ES fan
- -
cover and shaft
PPT-235ES RB-K93
P2 b 3/4 2 5/8 2 3/8 5 - 5 : 120 3800 2900 - 1/2 2500 - 3300 10400 - 11000
(37) (A021-001692)
(2.4 dia.): 210 8250

10" guide bar

- -
PPT-236ES RB-K113 and saw chain
P2 b 1 5/8 3 3/4 5 1/2 10 - 50 : 180 4300 3000 - 3/8 2500 - 3500 10400 - 11400
(37)(38) (A021-003881)
(2.4 dia.): 210 8000

WT-424C
PPT-2400 (36) C4 a - - 3 1/4 2 1/4 1 3/4 10 - 5 : 120 3450 2700 10500 - 11500 - - 2400 - 3200 10500 - 12000
(123000-52133)

PPT-2620ES/
WYG-9
HES - c (2.4 dia.): 210 3 7 1/4* 7 3/4* 10 - 50 : 180 4000 3000 - 8500 20 - 30 2700 - 3500 11130 - 11370
(A021-004600)
(37)(38)

12” guide bar and

RB-K89 - -
saw chain
PPT-265ES (A021-001532)
P2 b 1 3/8 2 1/2 8 1/8* 5 - 5 : 120 3700 2900 - 10 2600 - 3200 10500 - 11000
(37) RB-K94
(A021-001742) (2.4 dia.): 210 8500

12” guide bar and

- -
PPT-300ES WYK-233A saw chain
P1 b 3 1/8 13 1/4* 9 5/8* 5 - 5 : 120 3500 2700 - 20 - 40 2500 - 3000 10400 - 11400
(37) (A021-001340)
(2.4 dia.): 210 8500

*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 When Load adapter is shown, install Load adapter 91156.
 8. Shafted hedge trimmer, Pro-attachment series, Pruner,
Engine drill, Earth auger 27
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.2 Fig.3 Verify final engine speed
with standard equipment
Step 2: Step 5:
Step 5:
Adjust L Adjust H mixture needle to
Engine Turn H mixture
Engine Load mixture max. WOT speed
warm-up Step 4: needle
needle
Turn L mix- CCW to con-
Tool to Nylon head to max. idle Step 6:
Throttle Idle - WOT: ture firm engine
Limiter adjust (Line diameter): H L speed *1 Turn H mix- Final Idle Final WOT
Model Carburetor Shield Adjust Total needle CCW speed reduces Step 5':
cap/plug mixture Line length mixture mixture Adjust nylon ture needle range range
(Spec. code) (Parts No.) *2 Screw (sec.) to
(Table 1) needles or needle needle Step 3: line lengths CCW to (r/min) (r/min)
(TAS) set idle Step 6:
(Table 2) Blade diameter Set idle
speed Adjust H mix- to obtain the reduce WOT
(mm) speed following speed by the
(r/m) ture needle
with TAS speed following
to set WOT
(r/m) speed
(r/m)

WYL-180A 9000
EDR-2100 (36) P1 b - - #32.5** 13* 1 3/8 10 - 50 : 180 3300 2900 - - - 2500 - 3500
(A021-000541) Minimum
WYL-56A 9000
EDR-2400 (36) P1 b - - #37** 13* 1 3/8 10 - 50 : 180 3300 2900 - - - 2500 - 3500
(123000-21361) Minimum
WYK-226A
EA-410 (36) P1 b - - 3 1/8 13 1/2* 3/4 10 - 20 : 120 3500 2500 9800 - 11500 - - 2300 - 2700 9800 - 11500
(A021-001172)

--- Initial setting ---

H & L mixture needles: Turn H and L mixture needles CW until lightly seated, then turn both mixture needles CCW.
* Turn L mixture needle counterclockwise until a clicking sound is heard. Then, screw the needle CW for the respective number of rotations.
** Size of fixed main jet - there is no H needle adjustment.
TAS: Turn screw CCW until its tip no longer touches the throttle plate. Then turn screw CW until its tip just comes into contact with the plate again. Finally, turn the screw CW for the respective number of rotations.
* Turn TAS CW until its head touches boss. Then turn TAS CCW.
*1 If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
*2 When Load adapter is shown, install Load adapter 91156.
 9. Duster/Mist blower, Blower, Shred ‘N’ Vac, Sprayer 28

Table 1: Limiter cap / plug Table 2: Tool

C2 125329-09860
a Fig. 1: Low speed setting Fig. 3: WOT setting
C3 125329-39030 Screwdriver 2 mm
6000 12000
Step2

C4 P003-000010 b

Engine speed
Engine speed
Step1
by TAS
Step3
Screwdriver 2.5 mm Idle rich down 10000
Step5
4000
Step6
C8 125329-08560 Step4
Step1

c
2000 L mixture needle adjustment 8000 H mixture needle adjustment
P1 A259-000000 D-shaped (S)

P2 P005-001270 e 2 1 0 2 1 0

Short D-shaped (S) Counterclockwise

= Richer
Clockwise
= Leaner
Counterclockwise
= Richer
Clockwise
= Leaner
Needle adjustment Needle adjustment

Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.3 Verify final engine speed with standard
equipment
Engine Step 2: Step 5:
warm-up Adjust L mixture Adjust H mixture needle
Tool to needle Step 4: to max. WOT speed
Throttle Idle - WOT:
Limiter adjust H L to max. idle speed *1 Turn L mixture
Model Carburetor Adjust Total Final Idle range Final WOT range
cap/plug mixture mixture mixture needle CCW to Step 6:
(Spec. code) (Parts No.) Screw (sec.) (r/min) (r/min)
(Table 1) needles needle needle Step 3: set idle speed Turn H mixture needle
(TAS)
(Table 2) Set idle speed (r/m) CCW to reduce WOT
with TAS (r/m) speed by the following
speed
WYK-200 7000
DM-4610 (36) P1 b 3 1/4 12* - 10 - 50 : 180 3300 2800 20 2500 - 3000
(A021-001041) Minimum
WYK-201 8000
DM-6110 (36)(37) P1 b #47** 12* - 10 - 50 : 180 3300 2800 - 2500 - 3000
(A021-000991) Minimum
WYK-375 8200
MB-580 (36) P1 b #47** 12* 1 1/2 10 - 50 : 180 3300 2800 - 2500 - 3100
(A021-003590) Minimum
WYK-377 7800
MB-5810 (38) P1 b 3 1/2 6 3/4 10 1/8* 10 - 180 : 190 3200 2600 40 2300 - 2900
(A021-003630) Minimum
ES-2100 (36) C1U-K43B L : C2
b 1 1/2 1 1/2 1 3/8 10 - 50 : 180 3000 2750 10 - 20 2400 - 3200 6900 - 8100
ES-2200 (36) (125200-20665) H : C8
C1U-K44B L : C2
ES-2400 (36) b 1 3/4 1 1/2 2 1/2 10 - 50 : 180 3000 2750 30 - 40 2400 - 3200 7500 - 8800
(125200-09565) H : C8
WTA-33 Vacuum: 6600 - 7200
ES-250ES (37)(38) - c 2 3/4 1 3/4 1/2 10 - 50 : 180 3400 3000 20 2700 - 3300
(A021-001882) Blower: 7300 - 7400
RB-K85
(A021-001350) Vacuum: 6000 - 6500
ES-255ES (37)(38) P2 b 7/8 4 1/8 1 5/8* 10 - 50 : 180 3400 2900 10 - 20 2500 - 3100
RB-K90 Blower: 7000 - 7300
(A021-001593)
C1U-K42B L : C2
PB-2100 (36) b 1 1/2 1 3/4 1 1/2 10 - 50 : 180 3000 2750 20 - 30 2400 - 3200 6800 - 7700
(125200-20565) H : C8
PB-2155 (36) C1U-K43B L : C2
b 1 1/2 1 1/2 1 1/2 10 - 50 : 180 3000 2750 10 - 20 2400 - 3200 6800 - 7700
PB-2200SI (36) (125200-20665) H : C8
PB-2455 (36) C1U-K44B L : C2
b 1 3/4 1 1/2 1 1/8 10 - 50 : 180 3000 2750 30 - 40 2400 - 3200 7500 - 8700
PB-2550 (36) (125200-09565) H : C8
 9. Duster/Mist blower, Blower, Shred ‘N’ Vac, Sprayer 29
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.3 Verify final engine speed with standard
equipment
Engine Step 2: Step 5:
warm-up Adjust L mixture Adjust H mixture needle
Tool to needle Step 4: to max. WOT speed
Throttle Idle - WOT:
Limiter adjust H L to max. idle speed *1 Turn L mixture
Model Carburetor Adjust Total Final Idle range Final WOT range
cap/plug mixture mixture mixture needle CCW to Step 6:
(Spec. code) (Parts No.) Screw (sec.) (r/min) (r/min)
(Table 1) needles needle needle Step 3: set idle speed Turn H mixture needle
(TAS)
(Table 2) Set idle speed (r/m) CCW to reduce WOT
with TAS (r/m) speed by the following
speed
WT-417C
PB-24LN (36) C4 a 3 3/8 2 1/4 1 1/8 10 - 50 : 180 3300 3000 20 - 30 2600 - 3200 7400 - 7800
(123000-09664)
WTA-33
PB-250 (37) - c 2 3/4 1 3/4 1/2 10 - 50 : 180 3400 3000 20 2700 - 3300 7300 - 7400
(A021-001882)
RE110147C 7150
PB-2520 (37)(38) P2 b 1 3/4 2 1/2 13* 10 - 180: 190 3500 3000 10 - 30 2800 - 3200
(A021-004700) Minimum
RB-K85
(A021-001350)
PB-251 (37) P2 b 7/8 4 1/8 1 5/8* 10 - 50 : 180 3500 3000 10 - 20 2800 - 3400 7200 - 7500
RB-K90
(A021-001593)
RB-K85
(A021-001350)
PB-255ES (37)(38) P2 b 7/8 4 1/8 1 5/8* 10 - 50 : 180 3400 2900 10 - 20 2700 - 3300 7200 - 7500
RB-K90
(A021-001593)
WYJ-257A 6800
PB-260LSI (36) P1 b #33** 12* 6 1/2 10 - 50 : 180 3200 2900 - 2800 - 3200
(A021-000122) Minimum
WYG-14 7150
PB-2620 (38) - c 2 1/4 7 3/4* 13* 10 - 180 : 190 3500 3000 20 - 40 2850 - 3150
(A021-004930) Minimum
RB-K85
PB-265ESL (37) P2 b 1 1/8 4 3/4 5 10 - 50 : 180 3500 2950 10 - 20 2800 - 3200 6700 - 7200
(A021-001352)
PB-265ESLT (37) RB-K85
P2 b 1 1/8 4 3/4 5 10 - 50 : 180 3500 2950 10 - 20 2800 - 3200 6700 - 7200
(38) (A021-001352)
C1M-K37D L : C2
PB-46LN (36) b 2 1 3/4 2 7/8 10 - 50 : 180 2750 2450 110 2400 - 2700 6200 - 6600
(125200-08566) H : C8
WLA-1
PB-500 (37) - c 3 1 1/2 3/8 10 - 50 : 180 3000 2550 40 2300 - 3000 6500 - 7000
(A021-001642)
WTA-35
PB-580 (37)(38) - c 2 3/4 3 3 7/8 10 - 180 : 190 3200 2700 20 - 40 2500 - 2900 6500 - 6800
(A021-004330)
C1M-K49C L : C2 7400
PB-6000 (36) b 1 1/2 1 1/2 1 1/2 10 - 50 : 180 3050 2800 20 - 30 2500 - 2900
(125200-08667) H : C3 Minimum
C1M-K76 L : C2
PB-620 (36) b 3 1 3/4 3 1/8 10 - 50 : 180 2750 2500 10 - 20 2400 - 3000 7300 - 7600
(A021-000773) H : C3
C1M-K76 L : C2
PB-625 (36) (37) b 3 1 3/4 3 1/8 10 - 50 : 180 2750 2500 10 - 20 2400 - 3000 7300 - 7600
(A021-000773) H : C3
WYK-150A 6800
PB-650 (36) P1 b #58.5** 11 1/2* 5/8 10 - 50 : 180 2700 2500 - 2200 - 2700
(A021-000311) Minimum
WYK-192
PB-655 (36) P1 b 3 3/4 9* 8* 10 - 50 : 180 2800 2550 10 - 20 2400 - 2800 6800 - 7300
(A021-000811)
WYK-179A 6800
PB-750 (36) P1 b #50** 10 1/2* 4 7/8 10 - 50 : 180 2700 2500 - 2200 - 2700
(A021-000621) Minimum
WYK-192
PB-755 (36) P1 b 3 3/4 9* 8* 10 - 50 : 180 2800 2550 10 - 20 2400 - 2800 6800 - 7300
(A021-000811)
 9. Duster/Mist blower, Blower, Shred ‘N’ Vac, Sprayer 30
Step 7:
Adjustment process -> Step 1: Initial settings Fig.1 Fig.3 Verify final engine speed with standard
equipment
Engine Step 2: Step 5:
warm-up Adjust L mixture Adjust H mixture needle
Tool to needle Step 4: to max. WOT speed
Throttle Idle - WOT:
Limiter adjust H L to max. idle speed *1 Turn L mixture
Model Carburetor Adjust Total Final Idle range Final WOT range
cap/plug mixture mixture mixture needle CCW to Step 6:
(Spec. code) (Parts No.) Screw (sec.) (r/min) (r/min)
(Table 1) needles needle needle Step 3: set idle speed Turn H mixture needle
(TAS)
(Table 2) Set idle speed (r/m) CCW to reduce WOT
with TAS (r/m) speed by the following
speed
WYK-387
PB-760LN (37) - c 3 5/8 6 1/2* 5/8 10 - 50 : 180 3000 2500 10 2300 - 2700 5800 - 6200
(A021-003971)
WYK-345
(A021-001870)
PB-770 (37)(38) - c 4 3/4 5 1/4* 9* 10 - 50 : 180 3000 2500 10 2300 - 2700 6600 - 6800
WYK-406
(A021-003941)
WYAB-1 7500
PB-8010 (38) - e 2 1/2 2 9 1/4* 30 - 180 : 210 2900 2500 60 - 80 2300 - 2700
(A021-004920) Minimum
NOTE: Before adjusting H mixture needle to WOT maximum speed, warm up the engine 180 sec. with WOT engine speed 7650 r/min over.
RB-K69A
SHR-150SI (36) P2 b 1 1/2 3 1 3/4 10 - 50 : 180 3500 2950 200 2700 - 3200 6700 - 7500
(A021-000663)
NOTE: If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.
RB-K107
SHR-170SI (37) P2 b 1 1/2 3 1 3/4 10 - 50 : 180 3500 2950 200 2700 - 3200 6700 - 7500
(A021-003601)
NOTE: If clutch engages during adjustment, reduce engine speed by turning TAS CCW until clutch disengages and then redo step 2.

--- Initial setting ---

H & L mixture needles: Turn H and L mixture needles CW until lightly seated, then turn both mixture needles CCW.
* Turn L mixture needle counterclockwise until a clicking sound is heard. Then, screw the needle CW for the respective number of rotations.
** Size of fixed main jet - there is no H needle adjustment.
TAS: Turn screw CCW until its tip no longer touches the throttle plate. Then turn screw CW until its tip just comes into contact with the plate again. Finally, turn the screw CW for the respective number of rotations.
* Turn TAS CW until its head touches boss. Then turn TAS CCW.
MEMO 31