1981 Ski-Doo Shop Manual Supplement, Page 36Get this manual

SECTION 03 SUB-SECTION 02 (ENGINES)
377 ENGINE TYPE
For service information on the 1981- 377 engine type, refer to the 1980 Bombardier Snowmobiles Shop Manual section 03-02 (377 engine type)For service procedure on the following item

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