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Troubleshooting Guide
Poor Running or No Power at High
Speed:
Firing incorrect:
Spark plug dirty, broken, or gap malad-
justed
Spark plug cap or high tension wiring trou-
ble
Spark plug cap shorted or not in good con-
tact
Spark plug incorrect heat value
ECU trouble
Crankshaft sensor trouble
Flywheel damage
Ignition coil trouble
Wiring connector not in good contact
Fuel/air mixture incorrect:
Air cleaner clogged, poorly sealed, or miss-
ing
Air cleaner duct loose
Water or foreign matter in fuel
Throttle body assy holder loose
Fuel to injector insufficient (DFI)
Fuel tank air vent obstructed
Fuel line clogged
Fuel pump trouble
Compression low:
Spark plug loose
Cylinder head not sufficiently tightened
down
No valve clearance
Cylinder, piston worn
Piston ring bad (worn, weak, broken, or
sticking)
Piston ring/groove clearance excessive
Cylinder head gasket damaged
Cylinder head warped
Valve spring broken or weak
Valve not seating properly (valve bent, de-
formed, worn, carbon accumulation on
the seating surface.)
Decompression trouble
Knocking:
Carbon built up in combustion chamber
Fuel poor quality or incorrect
Spark plug incorrect heat valve
ECU trouble
Other:
Throttle valve won't fully open
Brake dragging
Air cleaner clogged
Water or foreign matter in fuel
Clutch slipping
Overheating
Engine oil level too high
Engine oil viscosity too high
Drive train trouble
Crankshaft bearing worn or damage
Engine Overheating:
Firing incorrect:
Spark plug dirty, broken, or maladjusted
Spark plug incorrect
ECU trouble
Fuel/air mixture incorrect:
Throttle body holder loose
Air cleaner duct loose
Air cleaner poorly sealed, or missing
Air cleaner clogged
Compression high:
Carbon built up in combustion chamber
Engine load faulty:
Clutch slipping
Engine oil level too high
Engine oil viscosity too high
Brake dragging
Drive train trouble
Lubrication inadequate:
Engine oil level too low
Engine oil poor quality or incorrect
Coolant incorrect:
Coolant level too low
Coolant deteriorated
Cooling system component incorrect:
Radiator clogged
Radiator cap trouble
Water pump not rotating
Clutch Operation Faulty:
Clutch slipping:
No clutch lever play
Clutch cable maladjusted
Clutch inner cable sticking
Friction plate worn or warped
Steel plate worn or warped
Clutch spring broken or weak
Clutch release function trouble
Clutch hub or housing unevenly worn
Clutch not disengaging properly:
Clutch lever play excessive
Clutch spring compression uneven
Engine oil deteriorated
Engine oil viscosity too high
Engine oil level too high
Clutch housing seized
Clutch release function trouble
Clutch hub nut loose
Clutch plate warped or rough
Clutch hub spline damaged
Gear Shifting Faulty:
Doesn't go into gear; shift pedal doesn't
return:
Clutch not disengaging
Shift fork bent, worn, or seized
Shift return spring pin loose
APPENDIX 17-13

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