Service manual

Page 149 of 151
18.4 LOSS OF POWER
• Raise the wheels off the ground and spin by hand – wheels spin poorly
o Brake dragging
o Drive chain too tight
o Damaged wheel bearing
o Wheel bearing needs lubrication
• Low tire pressure
o Tire punctured
o Faulty valve stem
• Engine speed does not increase when accelerating
o Fuel / air mixture ratio too rich or lean
o Clogged air cleaner
o Clogged muffler
o Restricted fuel flow
o Clogged fuel tank cap breather hole
• Check ignition timing – timing bad
o Faulty CDI unit
o Faulty A/C generator
• Low cylinder compression
o Leaking head gasket
o Worn cylinder and piston rings
• Clogged carburetor
o Clean carburetor jets with compressed air
• Fouled or discolored spark plug
o Clean the spark plug
o Improper spark plug heat range
• Check for engine overheating
o Excessive carbon deposited in combustion chamber
o Wrong type of fuel
o Fuel / air mixture ratio is lean
o Use of poor quality fuel
• Knoc
king when run at high speed
o Worn piston or cylinder
o Fuel / air mixture ratio is lean
o Wrong type of fuel
o Ignition timing too advanced
o Excessive carbon deposited in combustion chamber
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