1. GENERAL INFORMATION PEOPLE/PEOPLE S 250 ENGINE NOISE Symptom Probable Cause Valve clearance too large Valve noise Worn camshaft lobe Worn piston rings Piston noise Worn piston pin and connecting rod small end Excessive carbon build-up in combustion chamber Damaged cam chain tensioner Worn cam gear teeth Cam chain noise Worn or damaged cam chain Extended cam chain Faulty crankshaft bearing Crankshaft noise Worn crank pin bearing Worn or damaged final reduction gears Gear noise Worn final reduction gear shaft splines 1-26