Troubleshooting - Suzuki EN125-2A Service Manual

7 - 1 S E R V I C I N G I N F O R M AT I O N

TROUBLESHOOTING

ENGINE
Complaint
Engine will not start
or is hard to start.
Engine stalls easily.
Noisy enigne.
Symptom and possible causes
Compression too low
1. Valve clearance out of adjustment
2. Worn valve guides or poor seating of valves.
3. Valves mistiming.
4. Piston rings excessively worn.
5. Worn-down cylinder bore.
6. Poor seating of spark plug.
7. Starter motor cranks but too slowly.
Plug not sparking
1. Fouled spark plug.
2. Wet spark plug.
3. Defective pick up coil.
4. Defective ignitor unit.
5. Defective ignition coil.
6. Open or short circuit in high-tension cord.
No fuel reaching the carburetor
1. Clogged hole in the fuel tank cap.
2. Clogged or defective fuel cock.
3. Defective carburetor float valve.
4. Clogged fuel pipe.
5. Clogged fuel filter.
1. Fouled spark plug.
2. Defective pick up coil.
3. Defective ignitor unit.
4. Clogged fuel pipe.
5. Clogged jets in carburetor.
6. Valve clearance out of adjustment.
7. Clogged fuel filter.
Excessive valve chatter
1. Valve clearance too large.
2. Weakened of broken valve springs.
3. Worn down rocker arm or rocker arm shaft.
Noise appears to come from piston
1. Piston or cylinder worn down.
2. Combustion chamber fouled with carbon.
3. Piston pin or piston pin bore worn.
4. Piston rings or ring groove worn.
Noise seems to come from clutch
1. Worn splines of countershaft or hub.
2. Worn teeth of clutch plates.
3. Distorted clutch plates, driven and drive.
4. Clutch damper weakened.
Noise seems to come from crankshaft
1. Worn of burnt bearings.
2. Bjg-end bearings worn and burnt.
3. Thrust clearance too large.
Remedy
Adjust.
Repair or replace.
Adjust.
Replace.
Replace or rebore.
Retighten.
Consult "electrical complaints"
Clean or replace.
Clean and dry.
Replace.
Replace.
Replace.
Replace.
Clean.
Clean or replace.
Replace.
Clean or replace.
Clean or replace.
Clean.
Replace.
Replace.
Clean.
Clean.
Adjust.
Clean or replace.
Adjust.
Replace.
Replace.
Replace.
Clean.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.