2004 Ski-Doo REV Series Factory Service Manual, Page 65Get this manual
Section 03 TROUBLESHOOTING Subsection 01 (ENGINE)
The following chart is provided to help diagnose the probable source of troublesIt should be used as guidelineSome causes or corrections may not apply to specific modelNOTE: For engine management system troubleshooting, refer to appropriate subsectionSYMPTOM ENGINE BACKFIRES
CONDITION
TESTINSPECTION
NORMAL USE1Check spark plugsaCarbon accumulation caused by defective spark plug(s)Clean carbon accumulation from piston and cylinder head and install dry properly gapped spark plug(s)2Check ignition timingaTiming is too advancedSet timing according to specifications (refer to TECHNICAL DATA)3Check for erratic sparksaPoor electrical connectionsRepairbFaulty statorReplace defective parts4Check carburetoraFuel passages obstructedClean carburetor and install new filter(s)bFuel level too lowAdjust float level according to specifications5Check cooling systemaLow antifreeze levelAdjust antifreeze levelProceed with leakage test (refer to LIQUID COOLING SYSTEM) and repair as requiredbDefective tank capReplace capcDefective thermostatReplace thermostatdAir in systemBleed system