OFNA Racing

22692 Granite Way, Ste. B

Laguna Hills, Ca. 92653
(949) 586-2910
Www.ofna.com

RTR Instruction
Manual
PURE COMPETITION...........

PRE-ASSEMBLED
ASSEMBLED CHASSIS WITH RADIO AND ENGINE

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 REQUIRED FOR OPERATION

THINGS NEEDED You will need to buy a few items to start the engine and run the car.
• Use 20% nitro CAR fuel. Do not use airplane fuels, they will over
heat engine.

• Buy long glow plugs, like OFNA/PICCO P-7 (#51007). Use plugs
without idle bar. Do NOT buy hot plugs, like the MC-59.

In your box you will find..

• #10218 - Red “C” size glow heater
P-7S

Glow Fuel
20%

51007

You need to get batteries for the radio transmitter and the car receiver
packs.
#10211 Battery Pack 1000 NiMh
• Radio TX needs (8) eight AA batteries
5cell, flat............... $29.95 • Car needs (4) four AA batteries.
#10214 Battery Charger, Overnite AA Batteries ( 12 pcs )
$7.95
Recommendation:
You may want to upgrade the car battery pack to a Ni-Mh 5 cell Flat
type. This will give more run time.

TOOLS NOT INCLUDED IN KIT

Instant Cemment
Cutter

Phillips Type Screw Drivers ( L )

Curved Scissors

Masking Tape

Phillips Type Screw Drivers ( S ) Brush

Cross Wrench
#17109 $3.95

Needle Nose Pliers Paints

Glow Plug & 17MM Cross Wrench

Knife #10801 $6.95

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 READ THIS BEFORE RUNNING
Running a nitro kit is fun and easy, but to make this a safe • Clear oil and dirt from chassis with a degreaser.
and good experience you must observe a few rules. This
Precautions
kit is extremely fast, easily over 40MPH, and can seriously
• This kit is not a toy. Always run car with a second
injure someone if you are not careful.
person as a spotter and pitman.
Where to run car?
• Hot Parts - The pipe, manifold, engine and head are very
• Any running area you choose must be dry. Do not run
hot and will cause burns.
car near any water or wet dirt.
• Do not run on public streets. It is very easy to have the
• Rotating Parts - Keep hands away from the drive train,
car run over or damaged by hitting the curb.
wheels, and engine when engine is running.
• Do not operate car in tight confined places. The car is
very fast and will easily hit something. • Radio - Check batteries life before running the car. If
• Do not run near people or animals. The car is very fast
radio does not have full control of the car with steering
and will too easily hit someone.
and/or throttle/brake do not run until corrected. Failure to
• Due noise, you will want to consider the surrounding
correct this will result in possible injury and damage to the
area when operating the car.
• Do not operate the car at night. You will not be able to car or property.
drive it without hitting something.
• Glow fuel - Do leave the glow fuel unattended with the lid
• Do not operate the car indoors. Engine exhaust is not
off. Fuel contains Methanol and Nitro Methane and is
healthy.
flammable and poisonous.
Glow Fuel
• Glow fuel is poisonous! Store fuel in cool ventilated location. Refer the glow fuel
• Glow fuel is flammable! label for additional precautions.
• Do not leave in fuel bottle with lid off at any time.
• Don use any fuel other than glow fuel in this engine. • Car Fuel tank - Never store fuel in car tank, it will ruin the
engine if left in tank.
First Time Starting the Engine
Caution! When starting engine make sure the following is
observed.
• Oil the air filter FOAM Element! OFNA #10015.. $9.95
• Set engine Master needle to 4 turns (rich setting) IF YOU DO NOT BREAK-IN ENGINE
• Do not do this alone, get an experienced friend to help at
first. CORRECTLY, MAINLY AT LOW RPM,
• Fill fuel tank, try not to spill fuel. Do not spill fuel on
YOU WILL BREAK THE CONNECTING
receiver
• Hold car off the ground, so it will not runaway when first ROD!
starts
• Turn on Radio and check the linkage before starting
engine. FAILURE TO NOT READ AND
• Turn on car receiver battery switch.
• Always have an air filter on the carburetor to keep dirt FOLLOW BREAK-IN ENGINE
out.
INSTRUCTIONS WILL VOID
Engine Break-in
• See Engine Page. WARRANTY!
Emergency Stopping Engine When Running
• Remove air filter and cover carb. intake.
• Squeeze fuel line and hold until engine stops.
• With a rag, cover exhaust outlet.

Storing Car After Running

• Remove fuel from tank and fuel lines
• Turn off radio in car
• Put a few drops of after run in engine to keep it from
rusting.

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 * Align throttle servo same
CHECKING ENGINE THROTTLE as shown.

A B C
Brake ©
1. Insert AA batteries into 1. Pull Full Throttle. 1. Push trigger to full
transmitter (8 Pcs). brake position.
2. Adjust alum. Stopper to
A
2.Turn on transmitter.
increase or decrease
3.Turn on receiver. the brake.
4.Center throttle trims as Idle Position (A)
shown .

Full Throttle (B)

IMPORTANT
CHECK RADIO THROTTLE
AND STEERING SWITCHES
• Full throttle arm position.
BEFORE RUNNING CAR
Spring rod pulls throttle
barrel open and brake
B
rods release pressure on
brake cams.
* Insert into transmitter.

C
B A C
• Full brake arm position.
Spring compresses
forward and brake rods
pull brake levers.

#10021 - Black
ASSEMBLY OF THE AIR FILTER #10027 - Yellow
#10028 - Pink
Nylon Strap #10029 - Blue Nylon Strap
( Small ) Air Filter Connector ( Small )

#10016
Air Filter
Sponge
Refills

#10017 - Blue
#10018 - Yellow
#10019 - Rose
Foam Air filters Unit
3 x 10mm
Tapping Screw

You must oil foam filter before use.

Filter will not work if not oiled.
#10015, Foam
Filter oil, Very
Sticky....$9.95 Clean with soap and water only.
You will damage foam if washed
if fuel!

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 Notes: ASSEMBLY OF THE CLUTCH INTO ENGINE
3 x 5mm Screw Non-Pull Start Engines...
• Alum. Washer behind the flywheel is not needed when using Force engines or similar types. O.S. Engines will
require washer spacer.

• To check!..place the brass corn #10330 (big hole) against the engine bearing, then flywheel. You should be
3 X 8mm covering one or two thread of the engine shaft. If this is the case, you do not need an additional washer behind the
Washer flywheel.

You must cut the engine shaft if too long. Count 6 threads in front of the flywheel and mark. This is all you need to 3 x 20mm 3 x 20mm
tighten the clutch nut and mount the flywheel. Hex Screw Hex Screw
3 x 20mm Force Pull Start Engine...
Cap Screw • Force Pull Start Engines required NO additional spacer and no shaft cutting. The Force engines comes with an
alum. cast driver washer, you use this part as the spacer, not the alum. washer shown for O.S. installs
3mm Nylon
Locknut
But, you must find the #10329 brass corn (sml hole) for Flywheel. This special corn fits the smaller thread
diameter of the engine shaft. It will center the flywheel when tightening the clutch nut.

#10010
#10100 Clutch Shoes
#10398 - 12T Clutch Spring
Black Type #10330
#10399 - 13T Brass, Corn (big hole)
#10400 - 14T (stock)
#10401 - 15T
#10329
Brass, Corn (sml hole)
#10402 - 16T
3mm
#10403 - 17T
Nylon Lock
#10404 - 18T
Nut
Clutch Bells #34110
5x10x4mm
Ball Bearing
#34110
5x10x4mm
Ball Bearing SEE NOTES ABOVE

#10091
Clutch Nut #10040 (stock)
screw type 3 Pin 3mm
Flywheel, Taper Nylon Lock
3 x 8mm Nut
Washer #10041
Misc. Hardware * Shoes are 3 Pin #30480
3 x 5mm trailing. Flywheel, Hole
Screw
#10099 Engine Mount

#10098
SG Nut & Shim KiT
* Fit the flywheel using a cross
wrench or deep socket.
* Place the clutch shoes
If engine turns when tightening, with the clutch springs
hold piston with large thick tie-wraps over the 3 pins of the
and hard wood in exhaust port. flywheel. Engines with ground shafts and few threads
Do not use metal, it will Using a screw driver as a lever, are called SG Shaft. A special clutch nut is needed.
damage engine. bend the small end of the
clutch spring behind the The stock flywheel (#10040) is fine.
clutch nut and press
down to snap shoe in
place.

#10069
ASSEMBLY OF THE MANIFOLD AND Manifold Adapter #31991
( Red Silicone ) Manifold, Polished
MUFFLER

#10120
Manifold
Spring

*Tighten the strap

and cut off the excess.

Nylon Strap
#10079 ( Large )
Alum. CNC
Pressure Nipple
#10184
* Drill a hole (Size 3.5mm) Blue, Silicone Tube
in the place and align as shown.
Use a two part high temp. epoxy glue to
fully seal the nipple base.
#31992
Dual Chamber, Polished

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 ASSEMBLY OF THE BRAKE SYSTEM 2x8mm
Screw
#30800 2x4mm
3x12mm Screw
Brake System Plastic Parts Set Screw 2x6mm
Slider Washer
Servo Mount
2x25mm
3X3mm Screw 2mm
Set Screw Tie-Rod End

Scre
Cem w
ent

2x6mm 2mm
2mm Nut
3mm Washer Tie-Rod End
A-80B Nut
2mm Adjust
Mount 2x4mm
Adjust Nut Screw

ALIGN THROTTLE SERVO AND BRAKE SAME AS SHOWN

( Neutral Position )

Engine at idle

( Braking Position )

Brake is not on

Brake is on

Brake Adjust Nut

Less Brake ( Full Throttle Position )

More Brake
Engine at full throttle

Loose Tighten

* Tighten or loose the adjuster nut

will change the brake.

Brake is not on

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 ASSEMBLY OF THE TIRES, FOAM INSERTS AND WHEELS
#86044 - Red
#86091
#86045 - White Mini XX- Pin Tire
#86046 - Lime
#86047 - Yellow R

17mm 5-Star Wheels

Front Knuckle Arm

Assembly

#15071
17mm Wheel Nuts

Always use tire foam

donut when building tires.
IN
ST T
GL ANT TAN
UE Foam INS LUE
G

* Apply instant glue into

the groove of the wheel.
Rear Hub Assembly
WE RECOMMEND CA GLUE
#81091 - Med/soft FOR RUBBER TIRES. #86044 - Red
#81092 - Med.
#86045 - White
YOUR KIT COMES WITH PRE-GLUED #86046 - Lime
TIRES, BUT WHEN TIRES ARE WORN #86047 - Yellow
YOU MUST REPLACE THEM. MAKE TIRE #15071 #86048 - Black
AND WHEEL SET AS SHOWN 17mm Wheel Nuts #86049 - Chrome
Foam
17mm 5-Star Wheels,
Two (2) Pairs per bag.

STARTING OF THE ENGINE * To start the engine, use hand held starter
motor or starter box.
How to start the engine: Rubber wheel turns engine
1. Turn on transmitter and then receiver. flywheel.
2. Fill fuel tank with fuel bottle.
3. Connect 1.2V glow plug starter.
4. Start engine with 12V starter or starter box
( Note the direction of the starter.)
5. After the engine be started, remove the
1.2V glow plug starter.
#10250
Starter Box
* Follow the engine manufacturer instruction manuals
regarding engine set-up, carburetor and maintenance.
12V Starter

1.2V
Glow Plug
Starter

* Note the direction of the

starter.

Connect with 12V battery

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 ENGINE BREAK-IN AND TUNNING
(BREAK-IN THE ENGINE BEFORE DRIVING THE CAR!)

• Choose a wide clear outdoor location with low dirt and dust. OPTIONAL OFNA CAR STANDS
• Set the car on box or holder with wheels off the ground.
• Turn on radio and car. Make sure throttle is at idle position.
• Fill fuel tank and set master engine needle.
• Prime fuel line and Heat glow plug before pull starting engine.
• When started, let engine fast idle for two tanks of fuel.

WOOD BLOCK

TUNING AFTER BREAK-IN

Close master needle by turning clockwise until it stops.
Then open needle by turning counterclockwise 3 turns
(rich setting). When running car, adjust carb with 1/8 clockwise turns,
slowly leaner, until the top speed good. Check engine
temp, if possible, for no more 250 degrees.

Adjust low end needle for best throttle response. Use only
small turns. From idle, give it full throttle, if throttle is slow
lean out needle until good.
Adjust barrel stop so it will not close, accept for a small gap.
This gap will be the idle setting. You will notice the idle will
increase with a wide gap.

Idle adjuster screw &

Barrel Stop

Lean Rich

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 0 10 20 30 40 50
1:1 SCREW SHEET mm

3 x 5mm Cap Screw 3 x 3mm Set Screw M3 Nut

3 x 10mm Cap Screw 3 x 5mm Set Screw

M4 Nut
3 x 8mm Set Screw
3 x 12mm Cap Screw
3 x 10mm Set Screw
M3 Nylon Locknut
3 x 15mm Cap Screw
3 x 15mm Set Screw
M4 Nylon Kocknut
3 x 20mm Cap Screw 4 x 4mm Set Screw

3 X 25mm Cap Screw 4 x 10 mm Set Screw

M3 Flange Nut
( Steel )
3 x 5mm Tapping Screw 5 x 5mm Set Screw

2 X 6mm Washer
3 x 8mm Tapping Screw 2 x 4mm Screw
2mm X 7mm Washer
2 x 5mm Screw
3 x 10mm Tapping Screw
3 X 8mm Washer
2 x 6mm Screw
3 x 12mm Tapping Screw
5 X 9mm Washer
2 x 8mm screw
3 x 15mm Tapping Screw
5 X 10mm Washer
2 x 10mm Screw
3 x 20mm Tapping Screw

2 x 25mm Screw 5 X 12mm Washer

3 x 25mm Tapping Screw

3 x 5mm Screw
3 x 10mm Flat Head
Tapping Screw
2mm E-Ring
3 x 10mm Screw
3 x 15mm Flate Head
Tapping Screw 2.5mm E-Ring

3 x 15mm Screw
3 x 20mm Flat Head
3 mm E-Ring
Tapping Screw
3 x 20mm Screw
3 x 25mm Flat Head
Tapping Screw 4 mm E-Ring
3 x 30mm Screw
3 x 5 mm Flat Head
Screw
5 mm E-Ring
3 x 10 mm Flat Head
Screw 4 x 6mm Flat Head Screw

3 x 15mm Flat Head

Screw 4 x 10mm Flat Head Screw 6 mm E-Ring
3 x 20mm Flat Head
Screw
4 x 15mm Flat Head Screw
3 x 25mm Flat Head
Screw 7 mm E-Ring
4 x 20 mm Flat Head Screw

4 x 10mm Tapping Screw

4 x 10mm Flat Head
Tapping Screw
4 x 15mm Tapping Screw
4 x 16mm Flat Head
Tapping Screw
4 x 20 Tapping Screw
4 x 20mm Flat Head
Tapping Screw
4 x 25mm Tapping Screw
3 x 30mm Screw Pin
( Black )
4 x 15mm Tapping Screw
( Small Head ) 3 x 30mm Screw Pin
( Silver )
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