12-
1
-
3
ELECTRICAL SYSTEM
Check the following for lack of sparks.
1) Leads of the ignition coil or spark plug 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)
Incorrect spark timing.
(Is
the flywheel set in the correct position by the key?)
12-2
ENGINE MISFIRES
1)
Incorrect spark plug electrode 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)
Water in gasoline.
6)
Insufficient compression.
12-3
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.
12-4
ENGINE OVERHEAT
1)
Crankcase oil level low. Add
oil
immediately.
2)
Spark timing incorrect.
3)
Low grade gasoline
is
used, or engine is overloaded.
4)
Cooling air circulation restricted.
5)
Cooling air party misdirected causes
loss
of cooling efficiency.
6)
Cylinder head cooling fins clogged up with dirt.
7)
Engine operated in an ecnlosed space without fresh supply
of
cooling air.
8)
Exhaust gas discharge restricted, or carbon deposits in the combustion chamber.
9)
Engine running on low-octane gasoline detonates due to heavy load
at
low speed.
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35
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