1989 Ski-Doo Repair Manual, Page 45Get this manual
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Section 02 ENGINE Sub-section 01 (247 ENGINE TYPE)
21 Nm 115 Iblltl
A002 002 071
7 Crankcase half (PTO side) 2 Polyamid ring (2) 3 Scud MB 56 (crankcase with scuds) (2)