APRILIA RS 250 Service And Repair Manual page 185

Complaint
Slipping clutch
Dragging clutch
Transmission will
not shift
Transmission will
not shift back
Transmission jumps
ou of gear
Engine idles
poorly
Engine runs
poorly in
high-speed range
Dirty or heavy
exhaust smoke
Engine lacks
power
Engine overheats
Symptom and possible causes
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.
1. Broken return spring on gearshift fork shaft.
2. Gearshift fork shafts are rubbing or sticky.
1. Worn shifting gears on drive shaft or countershaft.
2. Distorted or worn gearshift forks.
3. Weakened stopper spring on gearshift stopper.
1. Spark plug gap too wide.
2. Defective ignition coil.
3. Defective ignition system.
4. Float-chamber fuel level out of adjustment in
carburettor.
5. Clogged jets.
1. Spark plug gap too narrow.
2. Clogged jets.
3. Defective ignition coil.
4. Defective ignition system.
5. Float-chamber fuel level too low.
6. Clogged air cleaner element.
7. Clogged fuel pipe, resulting in inadequate fuel
supply to carburettor.
8. Exaust valve control out of adjustment.
9. Defective exhaust valve control unit, actuator or
exhaust valve.
1. Oil pump out of adjustment.
2. Damaged or worn crankshaft oil seal.
1. Worn piston rings or cylinder.
2. Spark plug gap incorrect or defective ignition system.
3. Clogged jets in carburettors.
4. Float-chamber fuel level out of adjustment.
5. Clogged air cleaner element.
6. Imbalance of the carburettors.
7. Sucking air from intake pipe.
8. Supplying too much engine oil.
1. Heavy carbon deposit on piston crown.
2. Not enough oil supply.
3. Defective oil pump or clogged oil lines.
4. Fuel level too low in float chambers.
5. Sucking air from intake pipes.
6. Using incorrect engine oil.
7. Defective cooling system.
SERVICING INFORMATIONM8 - 8
Remedy
Adjust.
Replace.
Replace.
Replace.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Repair or replace.
Adjust.
Clean.
Adjust.
Clean.
Replace.
Repair or replace.
Adjust.
Clean.
Clean and refuel.
Adjust.
Replace.
Adjust.
Replace.
Replace.
Adjust or replace.
Clean.
Adjust.
Clean.
Adjust.
Retighten or replace.
Adjust oil pump.
Clean.
Adjust oil pump.
Replace or clean.
Adjust.
Retighten or replace.
Use prescribed oil.
See radiator section.