Troubleshooting; Engine - Suzuki LT-Z250 Service Manual

9-2 SERVICING INFORMATION

TROUBLESHOOTING

ENGINE

Complaint
Engine will not start
or is hard to start.
Engine stalls easily.
Engine is noisy.
Symptom and possible causes
Compression too low
1. Worn cylinder.
2. Worn piston ring.
3. Worn valve guide or improper valve seating.
4. Loose spark plug.
5. Slow cranking starter motor.
6. Mistimed valves.
7. Valve clearance out of adjustment.
Spark plug not sparking
1. Fouled spark plug.
2. Wet spark plug.
3. Defective ignition coil.
4. Open or short in high-tension cord.
5. Defective generator.
6. Defective CDI unit.
No fuel reaching the carburetor
1. Clogged fuel tank vent hose.
2. Clogged or defective fuel valve.
3. Defective carburetor needle valve.
4. Clogged fuel hose.
5. Clogged fuel filter.
1. Fouled spark plug.
2. Defective generator.
3. Defective CDI unit.
4. Clogged or defective fuel valve.
5. Clogged carburetor jet.
6. Valve clearance out of adjustment.
Excessive valve chatter
1. Excessive valve clearance.
2. Weak or broken valve spring.
3. Worn rocker arm and rocker arm shaft.
Noise seems to come from the piston
1. Worn piston.
2. Worn cylinder.
3. Carbon build-up in combustion chamber.
4. Worn piston pin or piston pin bore.
5. Worn piston ring or ring groove.
Noise seems to come from the cam chain
1. Stretched cam chain.
2. Worn cam chain sprocket.
3. Improperly working cam chain tension adjuster.
Noise seems to come from the clutch
1. Worn splines of crankshaft or inner race.
2. Worn splines of countershaft or hub.
3. Worn teeth of clutch plates.
4. Distorted clutch plates, driven and drive.
5. Clutch dampers weakened.
Remedy
Replace.
Replace.
Repair or replace.
Tighten.
See electrical section.
Adjust.
Adjust.
Clean or replace.
Clean and dry or replace.
Replace.
Replace.
Replace.
Replace.
Clean or replace.
Clean or replace.
Replace.
Clean or replace.
Clean or replace.
Clean or replace.
Replace.
Replace.
Clean or replace.
Clean.
Adjust.
Adjust.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Replace.
Replace cam chain and
sprockets.
Replace cam chain and
sprockets.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.