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21
Dirt or something like this fill up
among air cooling fins
Clear away dirt or something like
this
Cooling fan is loosen, losing
function
Reinstall well
The rod deformation makes
piston and cylinder bushing side
wear
Replace tie rod
Cylinder or piston or piston ring
is worn, resulting in air flow
between cylinder and crankcase
Replace the worn
Improper adjustment of engine
speed produces excessive
rotational speed
Readjust engine speed to proper
value by speed regulator
Crankshaft main bearing is burnt
out
Replace main bearing
NOTE: the gasoline should run under certain temperature. Generally, permitting temperature at the
flow guard outlet is between 80-110℃, while the temperature of the crankcase is about 60℃ under
the magneto. If temperatures surpass the limits, it is an indication that the gasoline engine is
excessively hot.
VI. THERE EXISTS ABNORMAL NOISE WHEN ENGINE RUNNING
TROUBLE CAUSE REMEDY
Piston, piston ring or cylinder is
worn
Replace the worn
Tie rod or piston pin and piston pin
hole is worn
Replace the worn
Crankshaft main bearing is worn Replace
Abnormal noise
Piston ring is broken Replace
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
Improper fuel brand Replace fuel
There is an abnormal
noise during
combustion
Engine is excessively hot Find a cause and eliminate it
Improper valve clearance
Readjust calve clearance
properly
The other
Fly wheel is not connected with
crankshaft tightly
Connect tightly
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