Problem Cause Reparation
1. Wet spark plug electrodes Make them dry
2. Carbon deposited on the electrodes Cleaning
3. Insulation failure by insulator damage Exchange
4. Improper spark gap Adjust to 0.6-0.7mm
5. Burn out of electrodes Exchange spark plug
1. Ignition coil inside failure Exchange
2. Damaged cable sheath or disconnected Exchange or repair
1. Switch is OFF Set the switch to ON
2. Switch failure Exchange
3. Primary wiring earthed Repair
1. Over sucking of fuel Drain excess fuel
2. Too rich fuel Adjust carburettor
3. Overflow Adjust or exchange carburettor
4. Clogging of air cleaner Wash with mixed gasoline
5. Faulty fuel Change with proper fuel
1. Worn out cylinder, piston or piston ring Exchange
2. Gas leakage from cylinder and
crank case gasket
Apply liquid gasket and reassemble
1. Choked breather air hole Cleaning
2. Clogged carburetor Cleaning
3. Clogged fuel filter Exchange fuel filter
Problem Cause Reparation
1. Air penetration from fuel pipe joints etc. Secure connection
2. Air penetration from intake tube joint or
carburettor joint
Change gasket or tighten screws
3. Water in fuel Change with proper fuel
4. Piston starts to seize Replace piston (and cylinder)
5. Muffler choked with carbon Cleaning
1. Fuel too lean Adjust carburetor
2. Clogging of cylinder fin with dust Cleaning
3. Inferior fuel Change with proper fuel
4. Carbon deposited in combustion chamber Cleaning
5. Spark plug electrode red hot Clean, adjust spark gap (0.6-0.7mm)
1. Dirty air cleaner Wash with mixed gasoline
2. Over loading Reduce load
WARNING:
Engine does not start
No spark in the spark plug
Spark plug
Magneto
Switch
Spark in the spark plug
Compression and fuelling is
normal
Fueling normal but poor
compression
Others
Fuel must never be poured into the waste water or anywhere else. This would
be punishable facts of the case. In the sewer there is an extreme risc of
explosion by spontaneous ignition even at low temperature with damage which
cannot be foreseen.
No fuel supply
Lack of power or unstable running
Compression is normal and
no misfire
Overheating
Trouble shooting
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