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13.4 Loss of Power
Wheels do not spin freely
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Brake dragging
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Drive chain too tight
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Damaged wheel bearing
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Wheel bearing needs lubrication
Low tire pressure
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Punctured tire
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Faulty tire valve
Engine speed does not increase when
accelerated lightly
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Fuel / air mixture ratio too rich or lean
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Clogged in air cleaner
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Clogged in muffler
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Restricted fuel flow
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Clogged fuel tank cap breather hole
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Clean and adjust
Bad ignition timing
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Faulty pulse generator
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Faulty CDI unit
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Cylinder compression too low
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Leaking head gasket
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Worn cylinder and piston rings
Clogged carburetor
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Clean and Adjust
Fouled or discolored spark plug
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Clean the spark plug
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Spark plug is incorrect heat range
Engine overheating
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Excessive carbon deposited in
Combustion chamber
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Wrong type of fuel
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Fuel / air mixture ratio is lean
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Use of poor quality fuel
Engine knocking at high speed
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Worn piston and cylinder
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Fuel / air mixture ratio is lean
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Wrong type of fuel
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Ignition timing too advanced
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Excessive carbon deposited in
Combustion chamber
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