Suzuki VZR1800 2007 Service Manual page 491

11-12 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 IAP sensor/lead wire
2. Short-circuited IAT sensor/lead wire
3. Sucking air from intake pipe joint
4. Defective fuel injectors
5. Defective ECT sensor
Other factors
1. Ignition timing is too advanced due to defective
timing advance system (ECT sensor, GP sensor,
CKP sensor and ECM).
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 plates
3. Distorted clutch plates or pressure plates
4. Clutch release screw out of adjustment
1. Some clutch spring weakened while others
are not.
2. Distorted pressure plates or clutch plates
3. Clutch release screw out of adjustment
1. Broken gearshift cam
2. Distorted gearshift forks
3. Worn gearshift pawl
1. Broken return spring on shift shaft
2. Rubbing or stickily 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.
Repair or replace.
Replace.
Replace.
Replace.
Check with inspection
window, drain out excess
oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust
Replace.
Replace.
Adjust
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.