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

Section 06 ELECTRICAL Subsection 03 (SPARK PLUGS)
SPARK PLUGS
NGK SPARK PLUG
All Models

NGK SPARK PLUG NUMBERING SYSTEM

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