1. GENERAL INFORMATION
.
G. Loss power
Check and adjustment
Fault condition
Probable causes
Raise wheels off ground and
spin by hand
Spin freely
Abnormal
Check tire pressure
●
Brake dragging
●
Drive chain too tight
●
Damaged wheel bearing
●
Wheel bearing needs lubrication
Normal
Abnormal
Accelerate lightly, engine speed
can be increase
Normal
Abnormal
Check ignition timing
Normal
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
Test cylinder compression
Normal
Abnormal
●
Leaking head gasket
●
Worn cylinder and piston rings
Check carburetor
Normal
Clogged
●
Clean
Check spark plug
Normal
Fouled or discolored
Check for engine overheating
Normal
Overheating
Accelerate or run at high speed
Normal
Knocks
●
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
1-16
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