Suzuki GSF1200S 2001 Service Manual page 276

Complaint
Engine lacks power.
Engine overheats.
Symptom and possible causes
1. Insufficient valve clearance.
2. Weak valve spring.
3. Mistimed valves.
4. Worn cylinder.
5. Worn piston ring.
6. Improper valve seating
7. Fouled spark plug.
8. Incorrect spark plug.
9. Clogged carburetor jet.
10. Incorrect float chamber fuel level.
11. Dirty air cleaner element.
12. Loose throttle valve synchronizing screw.
13. Air leakage from intake pipe.
14. Excessive amount of engine oil.
1. Carbon build-up on piston crown.
2. Insufficient amount of engine oil.
3. Defective oil pump.
4. Clogged oil circuit.
5. Float chamber fuel level too low.
6. Air leakage from intake pipe.
7. Incorrect engine oil.
SERVICING INFORMATION
Remedy
Adjust.
Replace.
Adjust.
Rebore or replace.
Replace.
Repair or replace.
Clean or replace.
Replace.
Clean.
Adjust float height.
Clean or replace.
Tighten.
Tighten or replace.
Check level and drain.
Clean.
Check level and add.
Replace.
Clean.
Adjust float height.
Tighten or replace.
Change.
7-5