1981 Ski-Doo Shop Manual Supplement, Page 103Get this manual
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SECTION 05 SUB-SECTION 04 (D RIVEN PULLEY )
75 Countershaft
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Extension Washer Lockwasher 74 Screw 7420 34 Screw 51678 58 Elastic stop nut 51678 Disc Screw 7