2001 Ski-Doo Factory Shop Manual Volume Three, Page 58Get this manual
Section 03 TROUBLESHOOTING Subsection 02 (ENGINE)
SYMPTOM CONDITION TestInspection ENGINE BACKFIRESNORMAL USE1Check spark plugsaCarbon accumulation caused by defective spark plug(s)Clean carbon accumulation and replace spark plugs2Check ignition timingaTiming is too advancedSet timing according to specifications (refer to TECHNICAL DATA)3Check carburetoraFuel passages obstructedClean carburetor and install new filter(s)bFuel level too lowAdjust float level according to specifications4Check cooling systemaLow antifreeze levelAdjust antifreeze levelThen check clamps or hosesbDefective tank capReplace capcAir in systemBleed systemSYMPTOM CONDITION TestInspection ENGINE SUDDENLY TURNS OFF AT HIGH RPM ANDOR WITH LIGHT LOADNORMAL USE1Check that all ground wires are well connected