1985 Ski-Doo snowmobile Service Manual, Page 60Get this manual

Sub-section 03
Section 02 ENGINE (377 ENGINE TYPE)

To minimize the effect of acceleration forces on circlip, install each circlip so the circlip break is at 0' clock as illustratedRemove any burrs on piston caused through circlip installation using very fine emery cloth

1 ,2, Nutsdistance nuts
Position nuts and distance nuts as Illustrated
Exhaust

Piston notch

Distance nuts
AOO9002002

Clrcllp break
AOQ 1002002

.r CAUTION: Circlips must not move freely in the
groove after installationIf so, replace them

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