Suzuki UY125 Service Manual page 217

Complaint
Noisy engine. Noise seems to come from timing chain
1. Stretched chain.
2. Worn sprocket.
3. Not working tension adjuster.
Noise seems to come from clutch
1. Worn or slipping drive belt.
2. Worn rollers in the movable drive face.
Noise seems to come from crankshaft
1. Due to wear rattling bearings.
2. Worn and burnt big-end bearing.
3. Worn and burnt journal bearings.
4. Too large thrust clearance.
Noise seems to come from transmission
1. Worn or rubbing gears.
2. Badly worn splines.
3. Badly worn bearings.
Slipping clutch. 1. Worn or damaged clutch shoes.
2. Weakened clutch shoe springs.
3. Worn clutch housing.
4. Worn or slipping drive belt.
Engine idles poorly. 1. Valve clearance out of adjustment.
2. Poor seating of valves.
3. Defective valve guides.
4. Worn down camshaft.
5. Too wide spark plug gap.
6. Defective ignition coil.
7. Defective CDI unit.
8. Defective stator coil.
9. Clogged caburetor jet.
10. Idle adjust screw and pilot screw out of adjust-
11. Damaged or cracked vacuum hose.
12. Clogged air cleaner element.
13. Incorrect float chamber fuel level.
Symptom and possible causes
ment
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SERVICING INFORMATION
Remedy
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Repair or replace.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Clean or replace.
Adjust.
Replace.
Clean or replace.
Adjust float height.
7-3