2003 Ski-Doo REV Series Factory Shop Manual, Page 64Get this manual
Section 03 TROUBLESHOOTING Subsection 02 (ENGINE)
4Check carburetor adjustments and cleanlinessaInadequate carburetor adjustments or dirt accumulationAdjust according to specifications (refer to TECHNICAL DATA) or clean5Check drive beltaWorn beltReplace belt if width is mm (18 in) less than nominal dimension (refer to TECHNICAL DATA)6Check track adjustmentaToo much tension andor improper alignmentAlign track and adjust its tension to specifications (refer to TECHNICAL DATA)7Check drive pulleyaImproper calibration screw adjustments (TRA pulley) andor worn bushing(s)Adjust according to specifications (refer to TECHNICAL DATA) andor replace bushing(s)8Check driven pulleyaWorn bushing andor spring tensionReplace spring andor adjust its tension according to specifications (refer to TECHNICAL DATA)9Check exhaust systemaRestriction or exhaust system leakageReplace damaged parts andor reseal with Ultra Copper (refer to 593 HO and 793 ENGINE TYPES)10Check ignition timingaDecrease in power due to delayed ignitionAdjust according to specifications (refer to TECHNICAL DATA)11Check engine compressionaWorn piston(s) and ring(s)Replace (refer to TECHNICAL DATA for specifications)12Check engine cooling systemaCoolant level is low, cap fails to pressurize system or air circulates through linesAdjust level, replace cap or bleed cooling system13Check reed valveaImproper tightness andor openingReplace or adjustRefer to proper ENGINE subsection