Suzuki GSX-R750 Service Manual page 381

8-8 SERVICING INFORMATION
Complaint
Engine overheats.
Dirty or heavy
exhaust smoke.
Slipping clutch.
Dragging clutch.
Transmission will
not shift.
Transmission will
not shift back.
Transmission jumps
out of gear.
Symptom and possible causes
Defective engine internal parts
1. Heavy carbon deposit on piston crowns.
2. Not enough oil in the engine.
3. Defective oil pump or clogged oil circuit.
4. Sucking air from intake pipes.
5. Use incorrect engine oil.
6. Defective cooling system.
Lean fuel/air mixture
1. Short-circuited intake air pressure sensor/lead
wire.
2. Short-circuited intake air temp. sensor/lead wire.
3. Sucking air from intake pipe joint.
4. Defective fuel injector.
5. Defective engine coolant temp. sensor.
The other factors
1. Ignition timing is too advanced due to defective
timing advance system (engine coolant temp.
sensor, gear position sensor, crankshaft position
sensor and ECM.)
2. Drive chain is too tight.
1. Too much engine oil in the engine.
2. Worn piston rings or cylinders.
3. Worn valve guides.
4. Scored or scuffed cylinder walls.
5. Worn valves stems.
6. Defective stem seal.
7. Worn oil ring side rails.
1. Weakened clutch springs.
2. Worn or distorted pressure plate.
3. Distorted clutch plates or clutch plate.
1. Some clutch spring weakened while others
are not.
2. Distorted pressure plate or clutch plate.
1. Broken gearshift cam.
2. Distorted gearshift forks.
3. Worn gearshift pawl.
1. Broken return spring on shift shaft.
2. Rubbing or stickly shift shaft.
3. Distorted or worn gearshift forks.
1. Worn shifting gears on driveshaft or
countershaft.
2. Distorted or worn gearshift forks.
3. Weakened stopper spring on gearshift stopper.
4. Worn gearshift cam plate.
Remedy
Clean.
Add oil.
Replace or clean.
Retighten or replace.
Change.
See radiator section.
Repair or replace.
Repair or replace.
Clean or replace.
Repair or replace.
Replace.
Replace.
Adjust.
Check with inspection
window drain out
excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.