1980 Ski-Doo Shop Manual, Page 49Get this manual
SECTION 03 SUB-SECTION 02 (ENGINES)
277 ENGINE TYPE
I277 engine type
23456Engine support Lockwasher mm (6) Bolt MB 1.25 20(6) Cup (2) Anchor pad (3) Bushing (3) Flat washer 10.5 mm (3) Lockwasher 10 mm (2) Bolt MIO 150X 50(3) Nut IOmm Gasket (2) Air deflector Exhaust manifold Lockwasher mm (2) Bolt MB 30(2) Exhaust elbow Spnng (6) Muffler Muffler support Bolt M6 1.0.0X 40Spring Flat washer 6.4 mm Nut mm Spnng (2) 18 Spring Washer