Suzuki GN125F, Service Manual

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SERVICING INFORMATION
7-2
Remedy Symptom and possible causes Complaint
Dragging clutch.
Transmission will
not shift.
Transmission will
not shift back.
Transmission jumps
out of gear.
Engine idles poorly.
Engine runs poorly
in high speed range.
Dirty or heavy
exhaust smoke.
1.Clutch control out of adjustment or too much play.
2.Some clutch springs weakened.
3.Distorted pressure plate or clutch plates.
Adjust.
Replace.
Replace.
1.Broken gearshift cam.
2.Distorted gearshift forks.
3.Worn gearshift pawl. Replace.
Replace.
Replace.
1.Broken return spring on shift shaft.
2.Shift shafts are rubbing or sticky.
3.Distrorted or worn gearshift forks.
Replace.
Repair.
Replace.
1.Worn shifting gears on drive-shaft or counter-shaft.
2.Distorted or worn gearshift forks.
3.Weakened stopper pawl spring on gearshift cam.
4.Worn gearshift pawl. Replace.
Replace.
Replace.
Replace.
1.Valve clearance out of limit.
2.Poor seating of valves.
3.Defective valve guides.
4.Worn rocker arm or arm shaft.
5.Defective trigger coil.
6.Defective ignitor unit.
7.Spark plug gap too wide.
8.Defective ignition coil resulting in weak sparking.
9.Clogged jets.
Adjust.
Replace.
Replace.
Replace
Replace.
Replace.
Adjust or replace.
Replace.
Clean.
1.Valve springs weakened.
2.Valve timing out of limit.
3.Worn cams or rocker arms.
4.Spark plug gap too narrow.
5.Defective ignition coil.
6.Clogged air cleaner element.
7.Clogged fuel hose, resulting in inadequate fuel
supply to carburetor,
8.Defective trigger coil or ignitor unit.
Replace.
Adjust.
Replace.
Repair.
Replace.
Clean.
Clean and prime.
Replace.
1.Too much engine oil in the engine.
2.Worn piston rings or cylinder.
3.Worn valve guides.
4.Cylinder wall scored or scuffed.
5.Worn valves stems.
6.Defective stem seals.
7.Worn oil rings.
Check with inspection
window.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
1. Loss of valve clearance.
2. Weakened valve springs.
3. Valve timing out of limit.
4. Worn piston ring or cylinder.
5. Poor seating of valves.
6. Fouled spark plug.
7. Worn rocker arms or its shafts.
8. Spark plug gap incorrect.
9. Clogged jets in carburetor.
10. Clogged air cleaner element.
11. Too much engine oil.
12. Suck air intake pipe. Adjust.
Replace.
Adjust.
Replace.
Repair.
Clean or replace.
Replace.
Adjust or replace.
Clean.
Clean.
Drain out excess oil.
Retighten or replace.
1. Heavy carbon deposit on piston crown.
2. Not enough oil in the engine.
3. Defective oil pump or clogged oil circuit.
4. Air leak from intake pipe.
5. Use of incorrect engine oil. Clean.
Pour oil.
Repair or clean.
Retighten or replace.
Change.
Engine lacks power.
Engine overheats.