1997 Ski-Doo Factory Shop Manual Volume One, Page 191Get this manual

Section 05 ELECTRICAL Sub-Section 04 (SPARK PLUGS)
SPARK PLUGS
NGK SPARK PLUG
All Models

NGK SPARK PLUG NUMBERING SYSTEM

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives