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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
Improper valve clearance Readjust valve clearance properly
The other
Fly wheel is not connected with
crankshaft tightly
Connect tightly
TROUBLE CAUSE REMEDY
Piston, cylinder or piston ring is worn
excessively.
Replace the worn parts
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