2003 Ski-Doo ZX Series Factory Shop Manual, Page 96Get this manual

2003 Ski-Doo ZX Series Factory Shop Manual, Page 96

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Section 03 TROUBLESHOOTING Subsection 05 (ELECTRICAL SYSTEM)
SYMPTOM CONDITION TESTINSPECTION

SPARK PLUG TIP IS LIGHT GRAYNORMAL USE1 Refer to ENGINE SLOWS DOWN OR STOPS AT HIGH RPM