(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.
(1)Water or dirt in gasoline, or
(2)Intake valve stuck.
(3)Valves overheated, or hot carbon particles in the combustion chamber
(4)Engine cold.
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