Suzuki DL650K5 Service Manual page 413

ENGINE OVERHEATS
Symptom, possible causes and remedy
1) Defective engine internal parts
• Heavy carbon deposit on piston crowns.
• Not enough oil in the engine.
• Defective oil pump or clogged oil circuit.
• Sucking air from intake pipes.
• Use incorrect engine oil.
• Defective cooling system.
Symptom, possible causes and remedy
2) Lean fuel/air mixture
• Short-circuited IAP sensor/lead wire.
• Short-circuited IAT sensor/lead wire.
• Sucking air from intake pipe joint.
• Defective fuel injectors.
• Defective ECT sensor.
Symptom, possible causes and remedy
3) The other factors
• Ignition timing too advanced due to defective timing
advance system (ECT sensor, GP switch, CKP
sensor and ECM.)
• Drive chain is too tight.
DIRTY OR HEAVY EXHAUST SMOKE
Symptom, possible causes and remedy
• Too much engine oil in the engine.
• Worn piston rings or cylinders.
• Worn valve guides.
• Scored or scuffed cylinder walls.
• Worn valves stems.
• Defective stem seal.
• Worn oil ring side rails.
SLIPPING CLUTCH
Symptom, possible causes and remedy
• Weakened clutch springs.
• Worn or distorted pressure plates.
• Distorted clutch plates or pressure plates.
DRAGGING CLUTCH
Symptom, possible causes and remedy
• Some clutch springs weakened while others are
not.
• Distorted pressure plates or clutch plates.
TRANSMISSION WILL NOT SHIFT
Symptom, possible causes and remedy
• Broken gearshift cam.
• Distorted gearshift forks.
• Worn gearshift pawl.
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.
Adjust.
Check with inspection window. Drain excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
SERVICING INFORMATION 9-9