1999 Ski-Doo Factory Shop Manual Volume Two, Page 261Get this manual

1999 Ski-Doo Factory Shop Manual Volume Two, Page 261

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Section 06 ELECTRICAL Subsection 03 (SPARK PLUGS)
NGK SPARK PLUG NUMBERING SYSTEM
Bombardier uses NGK brand spark plugs on all its snowmobile modelsThe heat range identification system is: