TO START PETROL ENGINE. Tum on fuel tap ‘1 pull flywheel in opposite direction to arrow until compression is felt. Turn fuel regulator ‘R’ to start position, then while turning the starting handle place a finger on the Air valve “C’ to give the necessary rich mixture, After the engine has started turn down the fuel regulator as far as possible without slowing the engine. Every notch reduces fuel consumption and carbon deposit, TO START PETROL-VAPOURISING OIL ENGINE (New or Overhauled Engine). Fill main tank with paraffin or vapourising oil and the small container with petrol. Turn fuel tap to petrol and start as above. Allow to run for a few minutes on petrol before turning fuel tap main tank. If the engine misfires place a finger on the air valve" C’"to allow engine to pick up speed TO STOP. Tum off fuel until engine falters then turn quickly to petrol. Turn down regulator and shut off fuel at 3-way tap. Leave tap on main fuel tank open. The engine is now ready for restarting. Should the engine stop suddenly while running it will be necessary to turn off the fuel at the 3-way tap, drain the fuel from the carburettor and re-start as for a new or overhauled engine, IGNITION AT FAULT. Clean spark- ing plug points and re-set gap to .020” and test Use sparking plugs such as Lodge BBL or equivalent. If a good spark is not seen read magneto Instruction Book. Use Plug Lodge 3BL or equivalent when using vapourising oil. COMPRESSION. Loss of compression may be due to a valve sticking open or carbon on the valve seat. Pour a little paraffin around each valve stem. Compress each valve spring in turn with a screw- driver or suitable tool and slip it off allowing the valve to close with a snap Alternatively the loss of compression may be due to no tappet clearance, piston rings stuck in grooves, cylinder worn or cylinder head nuts slack. KNOCKING. May be caused by worn bearings, carbon deposit on the piston and cylinder’ head, overheating, overload, pre- ignition or loose flywheel. DECARBONISING. This is recommended every three months. Drain water system, remove top covers, sparking plug and radiator fan (if fitted), disconnect throttle rod and fuel pipe. ‘Slide out rocker shaft, removing rockers, push rods and valve stem caps. Remove nuts and washers which secure the cylinder head and lift slightly free gasket with a thin bladed knife, then lift off. Remove five nuts holding main bearing housing to the crankcase. Crankshaft, flywheel and housing can be removed, while supporting the piston and connecting rod. which may then be withdrawn through the top of the cylinder. Remove all carbon, grind in valves if pitted and replace all parts, Fit the flat side of the connecting rod next to the crank web. The cylinder gasket if damaged must be renewed. Tighten cylinder head nuts evenly and adjust tappet clearance to .031° when cold. After running engine, retighten cylinder head nuts and check tappet clearance, TIMING VALVES. Tum crankshaft to T.D.C., assemble timing case with cam at the top position as illustrated, the timing case may then be bolted to the crankcase, If the timing case has been dismantled, turn camshaft with cam at the top, turn trailing shaft with fork at the top and engage gears. Fit spiral gear to end of trailing shaft. TIMING IGNITION. Tum flywheel until ignition mark =s*—on rim is at the top. 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