11-1-3
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 are connected or bridged.
7) Incorrect spark timing.
11
-2
ENGINGE
MI
FIRES.
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)
Water
in
gasoline.
6)
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.
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 path misdirected causes loss of cooling efficiency.
6)
Cylinder head cooling
fins
clogged up with dirt.
7)
Engine operated in an enclosed 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 gaoline detonates due to heavy load at low speed.
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