2004 Bombardier Quest/Traxter Series Shop Manual, Page 65Get this manual
Section 03 ENGINE QUEST Subsection 02 (TROUBLESHOOTING)
CYLINDER AND HEAD
SYMPTOM CONDITION TestInspection UNUSUAL ENGINE NOISE ANDOR VIBRATION IN IDLE SPEEDNORMAL USE1Check operation of decompressor located on camshaftaDecompressor shaft is stuck andor torsion spring is damagedReplace spring andor decompressor mechanism2Check chain tensioner operationaFaulty chain tensionerReplace spring andor mechanismSYMPTOM CONDITION TestInspection UNUSUAL ENGINE NOISE ANDOR VIBRATION WHILE OPERATINGNORMAL USE1Check items and of UNUSUAL ENGINE NOISE ANDOR VIBRATION IN IDLE SPEED2Check noise coming from cylinder head areaaChain guide worn outReplace chain guidebStretched chain andor worn out sprocketReplace chain and sprocket at the same timecSprocket screw got looseRetighten screw with recommended torquedHydraulic element inside rocker arm(s) is(are) worn out (valve adjustment)Replace rocker arm(s)SYMPTOM CONDITION TestInspection OIL CONTAMINATION ON CYLINDER ANDOR HEADNORMAL USE1Check screws for torqueaLoose screwsRetighten screws with recommended torquebGaskets are brittle, hard, worn out or damagedReplace damaged gasket(s)cSpark plug in the contact area to ignition coil fouled by oilClean spark plug area and replace spark plug tube