1984 Ski-Doo Shop Manual, Page 394Get this manual
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SECTION 09 TECHNICAL DATA
2.55 (90 Impoz 86 U.soz Liquid cooled 4.54
2.27 (60 Impoz 77 U.Soz)
Axial fan
2.27 (SO Impoz 77 U.Soz) Liquid cooled 4.20
A