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8. Troubleshooting
8-4 Lack of output power or unstable revolution
Trouble Probable
Cause
Countermeasure
1. Air is entering at fuel pipe joints, etc
Secure connections.
2. Air is entering at intake tube joint or carburetor joint
Replace gasket or tighten screws.
3. Water in fuel
Replace with clean fuel.
4. Piston is starting to seize
Filing of seized surface with fine files.
Compression is
normal and no misfire.
5. Muffler choked with carbon
Clean.
1. Fuel too lean
Adjust carburetor.
2. Clogging of cylinder fins with dust
Clean.
3. Poor fuel quality
Replace with clean fuel.
4. Carbon deposited in the combustion chamber
Clean.
Overheating
5.Spark plug electrode red hot
Clean thoroughly and adjust spark gap
to 0.6
~
0.7 mm (0.023
~
0.028 in.).
1. Dirty air cleaner
Wash with mixed gasoline.
Others
2. Over loading
Reduce load.
8-5 The amount of the wind is weak
Trouble Probable
Cause
Countermeasure
1. The air cleaner element is clogged.
Clean the element.
2. Carbon adheres to the spark arrester.
Clean the spark arrestor.
Good compression
but cannot reach the
required revolutions at
full throttle
3. Carburetor is damaged.
Maintenance or replace.