11-1-3
ELECTRICAL SYSTEM
Check the following 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 points pitted or fused.
8)
Breaker arm stuck.
9)
Condenser leaking
or
grounded.
10) Incorrect spark timing.
11-2
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)
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.
114
ENGINE OVERHEAT
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
party misdirected causes loss of coohg efficiency.
Cylinder head
cooling
fins
clogged up with dirt.
Engine operated in
an
enclosed space without fresh supply of cooling air.
Exhaust gas discha'rge restricted,
or
carbon deposits in the combustion chamber.
Engine running on low-octane gasoline detonates due
to
heavy load at low speed.
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