1986 Ski-Doo Factory Shop Manual, Page 336Get this manual
Section 03 TRANSMISSION SUb-section 07 (CHAINCASE)
CAUTION: Cotter pin will rub on chaincase housing if installed otherwise
4Fold cotter pin over castellated nul flats onlv
AOO200300B
22r Snap ring
CAUTION: It is of the utmost importance to install the snap ring otherwise damage to the chalncase components may occur4015003011
Drive chain adjustment