30
Problem
Possible Cause
Solution
Lo w p o w e r
output
Fuel filter obstructed
Clean fuel filter and rod
Fall short of fuel
Adjust carburetor
Muffler fouled with oily
deposits
Clean the oily deposits
Piston, piston ring and
cylinder faulty
Replace piston and piston
ring
Conjoint surface of the
cylinder and crank cass leak
Repair
The seal is bad
Engine overheats chamber
fouled with oily deposits
Avoid using for long time at
high speed and heavy load.
Clean the oily deposits
E n g i n e
r u n n i n g
unstable
Piston, piston ring and
cylinder faulty
Replace piston and piston
ring
Piston pin, piston, bearing of
crank shaft faulty
Replace piston and bearing
Engine overheats
Avoid use for a long time
high speed and heavy load
Combustion chamber room
foulded with oily deposits
Clean the oily deposits
Petrol unfit
Replace with proper branded
octane
Spark gap is wrong
Adjust spark gap to 0.6-0.7mm
Coil gap is wrong
Adjust coil gap to 0.3-0.4mm