Fuel System Troubleshooting - Honda 1985 CBX750F Workshop Manual

HONDA
CBX750F
FUEL SYSTEM
TROUBLESHOOTING
Engine cranks but won't start
1. No fuel in tank
2. No fuel to carburetor
3. Eng ine flooded with fuel
4. No spark at plug (ignition malfunction)
5. Air cleaner clogged
6. I ntake air leak
7. Improper choke operation
8. I mproper throttle operation
Hard starting or stalling after starting
1. Improper choke operation
2. Ignit
ion malfunction
3. Fast idle speed incorrect
4. Carburetor malfunction
5. Fuel contaminated
6. I ntake air leak
7. Idle speed incorrect
Rough idle
1. Ignition malfunction
2. Idle speed incorrect
3. Incorrect carburetor synchronizat ion
4. Carburetor malfunction
·5. Fuel contaminated - - - - - - ­
Misfiring during acceleration
. Ignition malfunction
Backfiring
1. Ignit ion malfunction
2. Carburetor malfunction
Poor performance (driveability) and poor fuel economy
1. Fuel system clogged
2. Ignit ion malfunction
Lean mixture
1. Clogged fuel jets
2. Piston stuck closed
3. Faulty float valve
4. Float level low
5. Fuel cap vent blocked
6. Fuel strainer screen clogged
7. Restricted fuel line
8. Air vent tube clogged
9. Intake air leak
Rich mixture
1. Clogged air jets
2. Faulty float va lve
3. Float valve too high
4. Choke stuck closed
5. Dirty air cleaner
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