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10-
1
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3
IGNITION
SYSTEM
Check the followings for lack of sparks.
(1)
Wires 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.
10-
2
ENGINGE MISFIRES
(1)
Incorrect spark plug electrodge 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
(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.
hot season.
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 gaoline detonates due to heavy load at
low
speed.
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