1986 Ski-Doo Factory Shop Manual, Page 460Get this manual
Section 05 SUSPENSION Sub-section 07 (DRIVE AXLE)
Lock drive axle sprocket with new cotter pin (Elan model! or circlip (other single track models!Reinstall the chainc8s8 coverRefill with chaincase oilSee technical data, section 09L Install the suspensionApply track tension and carry out track alignment procedure, (See section 05-081