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ELECTRICAL SYSTEM
Check the followings for lack
of
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 with oil.
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)
Breaker arm stuck.
9)
Condernser leaking or grounded.
10) Incorrect spark timing.
11-2 ENGINGE MIFIRES.
1)
Incorrect spark plug electrodge gap. Adjust it to anywhere between
0.6
and
0.7
mm.
2)
Ignition cable worn and leaking.
3)
Sparks weak.
4)
Ignition wire connections loose.
5)
Pitted or worn breaker points.
6)
Water in gasoline.
7)
Insufficient compression.
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 the use of too volatile winter gas in the hot season.
4)
Air vent hole in the fuel tank cap plugged.
5)
Bearing parts seized due to lack
of
oil.
6)
Magneto
or
ignition coil faulty.
11
-4
ENGINE
OVERHEATS.
Crankcase oil level low. Add oil immediately.
Spark timing incorrect.
Low grade gasoline is used, or engine is overloaded.
Cooling air circulation restricted.
Cooling air path misdirected causes loss
of
cooling efficiency.
Cylinder head cooling fins clogged up with dirt.
Engine operated in an enclosed space without fresh supply
of
cooling air.
Exhaust gas discharge restricted, or carbon deposits in the combustion chamber.
Engine running on low-octane gaoline detonates due to heavy load at
low
speed.
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