1999 Ski-Doo Factory Shop Manual Volume Three, Page 85Get this manual

1999 Ski-Doo Factory Shop Manual Volume Three, Page 85

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Section 03 TROUBLESHOOTING Subsection 05 (ELECTRICAL SYSTEM)
FOULED (BLACK) SPARK PLUG TIPNORMAL USE1 Check carburetor(s)aCarburetion is too richAdjust according to specifications (refer to TECH