1989 Ski-Doo Repair Manual, Page 377Get this manual

1989 Ski-Doo Repair Manual, Page 377

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Section 04 ELECTRICAL SYSTEM Sub-section 03 (SPARK PLUGS)
SPARK PLUG NUMBERING SYSTEM
Bombardier is using the NGK spark plug type on most of the 1989 snowmobile modelsThe heat range identi