11- 1-3 ELECTRICAL SYSTEM
Check the followings for lackof sparks.
1)Leads of the ignition coil, spark plug or contact breaker disconnected.
2)Ignition coil damaged and shorted.
3)Spark plug cable wet or soaked withoil.
4)Spark plug dirty or wet.
5)Spark plug electrode gap incorrect.
6)Spark plug electrodes in contact with each other.
7)Contact breaker point pitted or fused.
8)Breakerarmstuck.
9)Condernser leaking or grounded.
10)Incorrectsparktiming.
11-2ENGINGEMIFIRES.
1)Incorrect spark plug electrodge gap. Adjust it to anywhere between 0.6 and 0.7 mm.
2)Ignition cable worn and leaking.
3)Sparksweak.
4)Ignition wire connections loose.
5)Pitted or worn breaker points.
6)Waterin gasoline.
7)Insufficientcompression.
11-3 ENGINE STOPS.
1)Fuel tank empty. Water, dirt, gum, etc. in gasoline.
2)Vapor lock, i. e., gasoline evaporating in the fuel lines due to overheat around the engine.
3)Vapor lock in the fuel lines or carburetor due to theuse of too volatile winter gas in the hot season.
4)Air vent hole in the fuel tankcap plugged.
5)Bearing parts seized due t o lack of oil.
6)Magneto or ignition coil faulty.
11- 4 ENGINE OVERHEATS.
Crankcase oillevel low. Add oil immediately. Spark timing incorrect.
Low grade gasoline is used, or engineis overloaded. Cooling air circulation restricted.
Cooling air path misdirectedcauses loss of cooling efficiency. Cylinder head coolingfins clogged up with dirt.
Engine operated in an enclosed space withoutfresh supply of cooling air. Exhaust gas discharge restricted, or carbon depositsin the combustion chamber. Engine running on
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