30
Clean exhaust pipe.
Shroud leaking.
Cooling fan loose. Reinstall.
piston and cylinder
Replace connecting rod.
Cylinder or piston or piston ring is
worn.
Replace the worn parts.
governor to produce high speed
Readjust engine governor.
worn.
Replace the worn part.
Connecting rod or piston pin and
piston pin hole are worn.
Replace the worn part.
Replace piston ring.
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Adjust electrode clearance.
Excess fuel.
Drain fuel and replace.
Engine is overheating.
Readjust valve clearance.
Fly wheel is not tightly connected
with the crankshaft.
Connect tightly.