Suzuki GZ250 Service Manual page 200

7-3 SERVICING INFORMATION
Complaint
Transmission will
not shift back.
Transmission jumps
out of gear.
Engine idles poorly.
Engine runs poorly in
high-speed range.
Exhaust smoke is
dirty or thick.
Engine lacks power.
Symptom and possible causes
1. Broken gearshift shaft return spring.
2. Rubbing or stuck gearshift shaft.
3. Worn or distorted gearshift fork.
1. Worn gear.
2. Worn or distorted gearshift fork.
3. Weakened gearshift cam stopper spring.
4. Worn gearshift pawl.
1. Valve clearance out of adjustment.
2. Improper valve s eating.
3. Worn valve guide.
4. Worn cam surface.
5. Excessive spark plug gap.
6. Defective ignition coil.
7. Defective pick-up coil or ignitor unit.
8. Spark plug too cold.
9. Incorrect float chamber fuel level.
10. Clogged carburetor jet.
11. Defective generator.
1. Weak valve spring.
2. Worn camshaft.
3. Insufficient spark plug gap.
4. Mistimed valves.
5. Ignition not advanced sufficiently due to poorly
working timing advance circuit.
6. Defective ignition coll.
7. Defective pick-up coil or ignitor unit.
8. Low float chamber fuel level.
9. Clogged air cleaner element.
10. Clogged fuel hose, resulting in inadequate fuel
supply to carburetor.
1. Excessive amount of engine oil.
2. Worn cylinder.
3. Worn piston ring.
4. Worn valve guide.
5. Scored or scuffed cylinder wall.
6. Worn valve stem.
7. Defective val ve stem oil seal.
8. Worn oil ring side rail.
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. Clogged air cleaner element.
12. Worn camshaft.
13. Air leaked from intake pipe.
Excessive amount of engine oil.
14.
Remedy
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Repair or replace.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace by hot type
plug.
Adjust float height.
Clean.
Replace.
Replace.
Replace.
Regap or replace.
Adjust.
Replace ignitor unit.
Replace. Replace.
Adjust float height.
Clean or replace.
Clean and prime.
Check level and drain.
Rebore or replace.
Replace.
Replace.
Rebore or replace.
Replace valve.
Replace.
Replace oil ring.
Adjust.
Replace.
Adjust.
Rebore or replace.
Replace.
Repair or replace.
Clean or replace.
Replace.
Clean.
Adjust float height.
Clean or replace.
Replace.
Tighten or replace.
Check level and drain.