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Ⅵ. THERE EXISTS ABNORMAL NOISE WHEN ENGINE RUNNING
There is noise of beating
Piston, piston ring or cylinder is worn
Tie rod or piston pin and piston pin
hole is worn
Crankshaft main bearing is worn
Too much carbon deposit in
combusting chamber
Clear away carbon deposit
Too small electrode clearance of
spark plug
Adjust electrode clearance properly
Engine is flooded with fuel
Check relative parts such as
carburetor
Engine is excessively hot
Find a cause and eliminate it