Suzuki EN125-2A Service Manual page 154

Complaint
Noisy engine. Noise seems to come from transmission
Slipping clutch.
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.
Symptom and possible causes
1. Gears worn of rubbing.
2. Badly worn splines.
3. Primary gears worn or rubbing.
4. Badly worn bearings.
1. Clutch control out of adjustment or loss of play.
2. Weakened clutch springs.
3. Worn or distorted pressure plate.
4. Distorted clutch plates, driven and drive.
1.Clutch control out of adjustment or too much play.
2.Some clutch springs weakened while others are not.
3.Distorted pressure plate or clutch plates.
1.Broken gearshift cam.
2.Distorted gearshift forks.
3.Worn gearshift pawl.
1.Broken return spring on shift shaft.
2.Shift shafts are rubbing or sticky.
3.Distrorted or worn gearshift forks.
1.Worn shifting gears on driveshaft or countershaft.
2.Distorted or worn gearshift forks.
3.Weakened stopper pawl spring on gearshift cam.
4.Worn gearshift pawl.
1.Valve clearance out of adjustment.
2.Poor seating of valves.
3.Defective valve guides.
4.Worn rocker arm or arm shaft.
5.Defective pick up coil.
6.Defective ignitor uint.
7.Spark plug gap too wide.
8.Defective ignition coil resulting in weal sparking.
9.Clogged jets.
1.Valve springs weakened.
2.Valve timing out of adjustment.
3.Worn cams or rocker arms.
4.Spark plug gap too narrow.
5.Defective ignition coil.
6.Clogged air cleaner element.
7.Clogged fuel pipe, resulting in inadequate fuel supply to carburetor,
8.Defective pick up coil or ignitor unit.
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 side rails.
S E R V I C I N G I N F O R M AT I O N
Remedy
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Replace.
Replace.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Replace.
Replace
Replace.
Replace.
Adjust or replace.
replace.
Clean.
Replace.
Adjust.
Replace.
Repair.
Replace.
Clean.
Clean and prime.
Replace.
Check with inspection window,
drain out excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
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