Malfunction
Possible cause
Remedy
Throttle cable incorrectly adjusted
Have checked by qualified expert per-
sonnel
Air filter clogged
Replace the air filter
Engine oil level too high
Check the engine oil level, if necessary
drain off engine down to the "MAX" mark
Clean the air intake
Have checked by qualified expert per-
sonnel
Exhaust blocked
Clean the exhaust
Engine defective
Have checked by qualified expert per-
sonnel
Carburettor defective
Have checked by qualified expert per-
sonnel
Engine runs irregu-
larly
Basic setting of governor arm de-
adjusted
Have checked by qualified expert per-
sonnel
Insufficient engine
power
Spark plug defective
Check the spark plug, replace if neces-
sary
Incorrect valve clearance
Check, adjust if necessary
Valve or valve seat worn or damaged
Have checked by qualified expert per-
sonnel
Cylinder, piston or piston rings worn
Have checked by qualified expert per-
sonnel
Engine runs with
high speed, but no
vibration
Centrifugal clutch defective
Have checked by qualified expert per-
sonnel
Mechanical defect
Have checked by qualified expert per-
sonnel
Troubleshooting – Engine malfunctions
BVT 65
92
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