G. Lose Power
Check and Adjustment Fault Condition Probable Causes
Raise wheels off ground and
spin by hand.
Brake dragging.
Drive chain too tight.
Damaged wheel bearing.
Wheel bearing needs lubrication.
Spin freely.
Abnormal
Punctured tire.
Faulty tire valve.
Fuel / air mixture ratio too rich or lean.
Clogged in air cleaner.
Clogged in muffler
Restricted fuel flow.
Clogged fuel tank cap breather hole.
Faulty pulse generator.
Faulty CDI unit.
Leaking head gasket.
Worn cylinder and piston rings.
Clean.
Clean the spark plug.
Spark plug is incorrect heat range.
Excessive carbon deposited in
combustion chamber.
Wrong type of fuel.
Fuel / air mixture ratio is lean.
Use of poor quality fuel.
Worn piston and cylinder.
Fuel / air mixture ratio is lean.
Wrong type of fuel.
Ignition timing too advanced.
Excessive carbon deposited in
combustion chamber.
Check tire pressure.
Normal. Abnormal
Accelerate lightly, engine speed
can be increased.
Normal Abnormal
Check ignition timing.
Normal Abnormal
Test cylinder compression.
Normal Abnormal
Check carburetor.
Normal Clogged
Check spark plug.
Normal Fouled or discolored
Check for engine overheating.
Normal Overheating
Accelerate or run at high speed.
Normal Knocks
TROUBLE SHOOTING CHARTS
45
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