1999 Ski-Doo Factory Shop Manual Volume Three, Page 58Get this manual

1999 Ski-Doo Factory Shop Manual Volume Three, Page 58

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Section 03 TROUBLESHOOTING Subsection 02 (ENGINE)
SYMPTOM CONDITION TestInspection ENGINE BACKFIRESNORMAL USE1 Check spark plugsaCarbon accumulation caused by defective spark plug(s)Clean carbon