2002 Ski-Doo Shop Manual Volume Three, Page 62Get this manual
Section 03 TROUBLESHOOTING Subsection 02 (ENGINE)
SYMPTOM CONDITION TESTINSPECTION ENGINE BACKFIRESNORMAL USE1Check spark plugs
The following chart is provided to help in diagnosing the probable source of troublesIt should be used as guidelineSome causes or corrections may not apply to specific model