Troubleshooting - Engine - Suzuki DR350 Service Manual

)·1 SERVICING INFORMATION
TROUBLESHOOTING
ENGINE
Complaint Symptom and possible causes
Remedy
Engine will not
1.
Valve clearance ou t of adjustment.
Adjust.
s tart . or is hard
2.
Worn valve guides or poor seating of valves .
Repair, or replace.
to start .
3 .
Valves mistiming .
Adjust.
4 .
Piston rings excessively worn .
Replace.
5.
Worn -down cylinder bore .
Replace,
or rebore.
6.
Improperly adjusted de-compression cable .
Replace .
7.
Poor seating of spark plug
Retighen
Plug not sparking
1. Fouled spark plug .
Clean .
2.
Wet spark plug.
Clean and dry .
3.
Defective ignition coil. Replace.
4.
Open or short in high-tension cord . Replace .
5. Defective pick-up coil or COl
unit .
Replace .
No fuel reaching the carburetor
1. Clogged hole in the fuel tank cap .
Clean.
2.
Clogged or defective fu el cock . Clean or replace.
3.
Defective carburetor float valve. Replace .
4.
Clogged fuel hose
Clean.
5. Clogged fuel filter. Replac e.
Engine stal1s 1. Fouled spark plug
Clean.
easily
2.
Defective pick-up coil or CDI unit. Replace.
3 .
Clogged fuel hose.
Replace.
4 . Clogged jets in carburetor Clean .
5.
Valve clearanc e out of adjustment.
Adjust.
6 . Defect ive ignition coil. Replace.
Noisy engine . excessive valve chatter
1 .
Valve clearance too large . Adjust
2.
Weakned or broken valve springs.
Replace.
3.
Cam shaft journal worn and burnt .
Replace.
4.
De-compression cable play Is maladjusted .
Adjust.
Noise appears to come from piston
1.
Piston or cylinder worn down . Replace .
2.
Combusion chamber f ouled wi th carbon. Clean.
3.
Piston pin or piston pin bore worn . Replace.
4 . Piston rigns or ring groove worn . Replace .
Noise seems to come from timing chain
1.
Stretched chain. Replace .
2.
Worn sprocket . Replace .
3.
Tension adjuster not working
Repair or replace.