2003 Ski-Doo REV Series Factory Shop Manual, Page 61Get this manual

2003 Ski-Doo REV Series Factory Shop Manual, Page 61

Section 03 TROUBLESHOOTING Subsection 02 (ENGINE)
SYMPTOM CONDITION TESTINSPECTION ENGINE BACKFIRESNORMAL USE1Check spark plugs
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 model

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