Troubleshooting; Engine - Suzuki FD 110 XCS Service Manual

7-2 SERVICING INFORMATION

TROUBLESHOOTING

ENGINE

Complaint
Engine will not start, or
is hard to start.
Engine stalls easily.
Noisy engine.
Complaint
Symptom and possible causes
Compression too low
1. Out of adjustment valve clearance.
2. Worn valve guides or poor seating of valves.
3. Mistiming valves.
4. Excessively worn piston rings.
5. Worn-down cylinder bore.
6. Too slowly starter motor cranks.
7. Poor seating of spark plug.
Plugs not sparking
1. Fouled spark plug.
2. Wet spark plug.
3. Defective ignition coil.
4. Open or short in high-tension cord.
5. Defective pick-up coil or CDI unit.
No fuel reaching the carburetor
1. Clogged fuel tank air-vent hose.
2. Clogged or defective tap.
3. Defective carburetor needle valve
4. Clogged fuel hose, fuel filter or vacuum hose.
1. Fouled spark plug.
2. Defective pick-up coil or CDI unit.
3. Clogged fuel hose.
4. Clogged jets in carburetor.
5. Out of adjustment valve clearance.
Excessive valve chatter
1. Too large valve clearance.
2. Weakened or broken valve springs.
3. Worn rocker arm or cam surface.
4. Worn and burnt camshaft journal.
Noise seems to come from piston
1. Worn down piston or cylinder.
2. Fouled with carbon combustion chamber.
3. worn piston pin or position pin bore.
4. Worn piston rings or ring grooves.
Noise seems to come from timing chain
1. Stretched chain.
2. Worn sprockets.
3. Not working tension adjuster.
Symptom and possible causes
Remedy
Adjust.
Repair or replace.
Adjust.
Replace.
Replace or rebore.
See electrical section.
Retighten.
Clean.
Clean and dry.
Replace.
Replace.
Replace.
Clean.
Clean or replace.
Replace.
Clean or replace.
Clean.
Replace.
Clean.
Clean.
Adjust.
Adjust.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Remedy