1986 Ski-Doo Factory Shop Manual, Page 282Get this manual
Section 03 TRANSMISSION Sub-section 04 (DRNEN PULLEY)
2, Castellated nut
Install spring washer and castellated nutTighten castellated nut fully then back off nut 16 of turn
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CAUTION: It is important that nut is backed offor damage may occur due to burnt or seized bearing CAUTION: Drive pulley alignment must alwaysbe checked whenever pulleys have been removed, replaced or disassembledFor pulley alignment procedure refer to section 03-05