10-1-3
IGNITION SYSTEM
Check the followings for lack of spark
.
(1)
Leads
of
the ignition coil or spark plug.
(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.
10-2
ENGINE MISFIRES
(1)
Incorrect spark plug electrode gap. Adjust it
to
anywhere between
0.7
and 0.8mm.
(2)
Ignition cable worn and leaking.
(3)
Sparks weak.
(4)
Ignition wire connections loose.
(5)
Water in gasoline.
(6)
Insufficient compression.
10-3
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.
10-4
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 sufficient 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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