1989 Ski-Doo Repair Manual, Page 119Get this manual
Section 02 ENGINE Sub-section 05 (503 ENGINE TYPE)
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Engine Rotax type 503 Stud M70 25 (4) Engine bracket Flat washer 70.5 mm 27 (4) Lock washer 70 mm (4) Hexagonal nut M70 (4) Rubber mount (4) Internal tooth cup washer (2) Washer (2) Hexagonal elastic stop nut M70 7.5 (4) Hexagonal head cap screw MB 7.25 Lock washer Muffler suppon Rubber mount Ilexagonal elastic flanged stop nut MB 7.25 Spring (3) Tuned pipe Gasket (4) Exhaust manifold Lock washer rnrn (4) Hexagonal socket head cap scrow MB 30 (4) Spring (4)