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10-5
ENGINE
KNOCKS
(1)
Poor quality gasoline.
(2)
Engine operating under heavy load
at
low
speed.
(3) Carbon
or
lead deposits in the cylinder head.
(4)
Spark timing incorrect.
(5)
Loose
connecting rod bearing due
to
wear.
(6)
Loose piston pin due
to
wear.
(7)
Cuases
of
engine
overheat.
10-6
ENGINE
BACKFIRES
THROUGH CARBURETOR
(1)
Water or dirt
in
gasoline,
or
low-grade gasoline.
(2)
Intake valve stuck.
(3)
Valves overheated,
or
hot
carbon particles in the combustion chamber
(4)
Engine cold.
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