Suzuki RM-z450 Owner's Service Manual page 56

3-4 TROUBLESHOOTING
Complaint
Noisy engine
Symptom and possible causes
Excessive valve chatter
• Too large valve clearance
• Weakened or broken valve springs
• Worn tappet or cam surface
• Worn and burnt camshaft journal
Noise seems to come from piston
• Worn down piston or cylinder
• Combustion chambers fouled with carbon
• Worn piston pin or piston pin bore
• Worn piston ring or ring groove
Noise seems to come from timing chain
• Stretched cam chain
• Worn sprockets
• Tension adjuster not working
Noise seems to come from clutch
• Worn splines of countershaft or clutch sleeve hub
• Worn teeth of clutch plates
• Distorted clutch plates, driven and drive
• Worn clutch release bearing
Noise seems to come from crankshaft
• Rattling bearings due to wear
• Worn and burnt big-end bearing
• Worn and burnt journal bearings
Noise seems to come from transmission
• Worn or rubbing gears
• Worn splines
• Worn bearings
Noise seems to come from water pump
• Worn or damaged impeller shaft
• Worn or damaged oil seal
• Contact between pump case and impeller
Remedy
Adjust
Replace
Replace
Replace
Replace
Clean
Replace
Replace
Replace
Replace
Repair or replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace