EC / MC / SM 2005 -
120
-
MALFUNCTION
POSSIBLE CAUSE
REMEDY
The engine operates irregularly
Engine lacks power or poor
acceleration
Abnormal engine noise
Detonations from the exhaust
pipe
White smoke coming out of the
exhaust pipe
Brown smoke coming out of the
exhaust pipe
- Ignition rotor damaged.
- Water in fuel.
- Fuel supply defective.
- Dirty air cleaner.
- Leaking or deteriorated exhaust system.
- Dirty carburetor jets.
- Worn or damaged crankshaft bearings.
- Clutch slips.
- Ignition problem.
- Overheating.
- Carbon build up in combustion chamber.
- Incorrect octane or poor quality gasoline.
- Damaged spark plug or incorrect
specifications.
- Deteriorated exhaust system gaskets.
- Deteriorated cylinder head gasket (water
leakage into the cylinder).
- Incorrect throttle valve cable adjustment.
- Restricted air cleaner.
- Main jet set too high.
- Replace the rotor.
- Drain the fuel tank and fill up with new fuel.
- Clean the fuel system and verify its operation.
- Clean or replace the air cleaner. Verify its operation.
- Verify if the exhaust system is damaged. Replace the
muffler fiberglass packing, if necessary.
- Disassembly the carburetor and clean all jets.
- Replace the crankshaft bearings.
- Verify the clutch operation. Go to a specialized workshop.
- Go to a specialized workshop.
- Refer to section 5.
- Clean the combustion chamber.
- Drain all gasoline and fill up with a higher octane fuel.
- Replace the spark plug with a new one of the correct type.
- Verify if the exhaust system is damaged. All gaskets must
be in perfect conditions, otherwise replace them with new
ones if necessary.
- Replace the cylinder head gasket. Go to a
specialized workshop.
- Readjust the throttle valve cable.
- Clean or replace the air cleaner. Go to a specialized
workshop.
- Verify main jet operation. Go to a specialized workshop.
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