TROUBLE
CAUSE
REMEDY
Normal cylinder compression
Normal spark plug spark
Something wrong with the fuel system
Fuel supply is not smooth or no fuel supply
1. There is no enough fuel in fuel tank and
fuel cock is closed.
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3. Fuel cock is clogged
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5. Needle valve is not closed properly or
start hole is clogged
6. Float is damaged or sticking
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2. Dredge air vent.
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4. Readjust or clean, blow to get
through
5. Dismantle needle valve and repaii,
dean, blow to get through
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Fuel supply is normal upply
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1. Replace
2. Replace
3. Drain extra fuel, diy up spark plug
electrodes
4. Select proper fhel brand corresponding
with the requirements.
Normal fuel supply system
Normal high-
tension line spark
Spark plug is in bad conditions
1. Too much carbon deposit and dirt around
electrodes
2. Electrodes are birni damaged seriously
or insulators damaged.
3. Improper electrodes gap.
1. Clear away.
2. Replace spark plug.
3. Adjust to proper value.
High-tension
line no spark
1. High tension line is damaged.
2. Ignition coil is damaged
3. Magneto loses magnetism
4. Wrong gap between ignition coil and
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1. Replace
2. Replace
3. Replace
4. Adjust gap between ignition and
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Abnormal cylinder compression
Normal fuel supply system
High-tension coil run out Normal
ignition system
1. Piston ring is worn to or even over its
wear limit
2. Piston ring is broken
3. Piston ring is sticking
4. Spark plug is not installed tighten or
without a gasket
5. Air leakage between cylinder block and
cylinder head
6. Air leakage in the valves
1. Replace
2. Replace
3. Clear up carbon fouling
4. Tighten with a gasket in
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of the surface by which cylinder block
contact- ins with cylinder head
Tigiiten cylinder head bolts in
stipulated order to stipulated torque.
6. Check valve. Clearance and tightness,
repair if necessaiy
TROUBLESHOOTING
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