HYOSUNG AQUILA 250 FI, Service Manual, Page: 74 / 90

73
SERVICING INFORMATION 7-1-8
Complaint Symptom and possible causes Remedy
Dirty or heavy
exhaust smoke.
Slipping clutch.
1. Too much engine oil in the engine.
2. Worn piston rings or cylinders.
3. Worn valve guides.
4. Cylinder wall scored or scuffed.
5. Worn valves stems.
6. Defective stem seals.
7. Worn side rails.
1. Weakened clutch springs.
2. Worn or distorted pressure plates.
3. Distorted clutch plates or pressure plates.
1. Some clutch springs weakened while others are not.
2. Distorted pressure plates or clutch plates.
1. Broken gearshift cam.
2. Distorted gearshift forks.
3. Worn gearshift pawl.
1. Broken return spring on shift shaft.
2. Rubbing or sticky shift shaft.
3. Distorted or worn gearshift forks.
1. Worn shifting gears on driveshaft or countershaft.
2. Distorted or worn gearshift forks.
3. Weakened stopper spring on gearshift stopper.
Check with inspection win-
dow, drain out excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Dragging clutch.
Transmission will
not shift.
Transmission will
not shift back.
Transmission
jumps out of
gear.