Troubleshooting - Honda 1998 VT750C Service Manual

TROUBLESHOOTING
Oil level low
• No fuel in tank
• No fuel to carburetor
- Fuel strainer clogged
- Fuel filter clogged
- Fuel valve stuck
- Fuel line clogged
- Fuel tank breather clogged
- Float level faulty
- Fuel pump malfunction
• Too much fuel getting to the engine
- Air cleaner clogged
- Flooded carburetor
• Intake air leak
• Fuel contaminated/deteriorated
- Jet clogged
• Improper starting enrichment valve operation
• Slow circuit or starting enrichment valve circuit clogged
• Improper throttle operation
• No spark at plug (ignition system faulty)
Lean mixture
Fuel jets clogged
Float valv,e faulty
Float level too low
Fuel line restricted
Intake air leak
Throttle valve faulty
Vacuum piston faulty
Throttle valve faulty
Fuel pump malfunction
Rich mixture
Starting enrichment valve open
Float valve faulty
Float level too high
Air jets clogged
Air cleaner element contaminated
Flooded carburetor
FUELSVSTEM
Engine stalls, hard to start, rough idling
Fuel line restricted
Ignition system malfunction
Fuel mixture too lean/rich
Fuel contaminated/deteriorated
- Jet clogged
Intake air leak
Idle speed misadjusted
Float level misadjusted
Fuel tank breather clogged
Pilot screw misadjusted
Slow circuit or starting enrichment valve circuit clogged
Carburetor synchronization misadjusted
Fuel pump malfunction
Valve clearance misadjusted
Cylinder compression too low
Afterburn when engine braking is used
• Lean mixture in slow circuit
• Air cut-off valve malfuncion
Backfiring or misfiring during acceleration
• Ignition system malfunction (Section 15)
• Fuel mixture too lean
Poor performance (driveability) and poor fuel economy
• Fuel system clogged
• Ignition system malfunction (Section 15)
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