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4-1-6 Abnormal sound
4-1-7 Exhaust gas color abnormal
TROUBLE CAUSE REMEDY
Piston, piston ring or cylinder is worn Replace the worn part
Connection rod or piston pin and piston pin
hole are worn
Replace the worn part
Crankshaft main neck is worn Replace bearing
Beating sound
Piston ring is broken Replace piston ring
Too much carbon deposit in combusting
chamber
Clear away carbon deposit
Too small electrode clearance of spark plug
Adjust electrode clearance properly
Metal beating sound
when abnormal
combustion occurs
Engine fuel is too much Check relative parts such as carburetor
Improper fuel brand Replace fuel
Engine is overheat Find a cause and eliminate it
The other Improper valve clearance Readjust valve clearance properly
Fly wheel is not connected with crankshaft
tightly
Connect tightly
TROUBLE CAUSE REMEDY
Piston, cylinder or piston ring is worn
excessively.
Replace the worn
Too much carbon deposit in combustion
chamber
Clear away
Too much carbon deposit in combustion
chamber
Clear away
Improper gasoline brand or low gasoline
quality
Replace with qualified gasoline
Black smoke or blue
thick smoke
Air cleaner is clogged up. Clean air cleaner filter element
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