·Clogged fuel tank breather hole ·Improperly adjusted valve
·Clogged air cleaner element clearance
·Clogged jet ·Improperly contacted
·Improperly adjusted fuel level valve and valve seat
·Improper carburetor air vent hose ·Faulty valve timing
setting Clutch
·Refer to “CLUTCH SLIPPING
/DRAGGING” section
Engine oil
·Improperly oil level (low or
over oil level)
Ignition system
·Faulty spark plug
·Faulty high tension cord
·Faulty ignitor unit
·Faulty pick up coil
·Faulty ignition coil
·Valve system
·Improperly adjusted valve
clearance
OVER HEATING OR OVER-COOLING
OVER HEATING OVER-COOLING
Ignition system Cooling system
·Improperly spark plug gap ·Faulty thermostat
·Improper spark plug heat rang ·Faulty thermo switch
·Faulty ignitor unit
Fuel system
·Improper carburetor setting ·Improper fuel level adjustment
·Clogged air cleaner element
Compression system
·Heavy carbon deposit build-up
·Improperly adjusted valve timing
·Improperly adjusted valve clearance
Engine oil
·Incorrect engine oil level
·Improper engine oil quality (high viscosity)
·Low engine oil quality
Brakes
·Dragging brake
Cooling system
·Inoperative fan motor
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