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1. GENERAL INFORMATION
G. Loss power
1-18
Fault condition Probable causes Check and adjustment
Raise wheels off ground and
spin by hand
y Brake dragging
Abnormal
y Drive chain too tight
y Damaged wheel bearing
y Wheel bearing needs lubrication
Spin freely
Check tire pressure
Normal Abnormal
Accelerate lightly, engine speed
can be increase
Normal Abnormal
Check ignition timing
y Punctured tire
y Faulty tire valve
y Fuel / air mixture ratio too rich or lean
y Clogged in air cleaner
y Clogged in muffler
y Restricted fuel flow
y Clogged fuel tank cap breather hole
Normal Abnormal
Test cylinder compression
Normal Abnormal
y Faulty pulse generator
y Faulty CDI unit
y Leaking head gasket
y Worn cylinder and piston rings
Check carburetor
Normal Clogged
y Clean
Check spark plug
Normal Fouled or discolored
y Clean the spark plug
y Spark plug is incorrect heat range
Check for engine overheating
y Excessive carbon deposited in
combustion chamber
y Wrong type of fuel
y Fuel / air mixture ratio is lean
y Use of poor quality fuel
y worn piston and cylinder
y Fuel / air mixture ratio is lean
y Wrong type of fuel
y Ignition timing too advanced
y Excessive carbon deposited in
combustion chamber
Normal Overheating
Accelerate or run at high speed
Normal Knocks
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