1979 Ski-Doo Supplementary Shop Manual, Page 216Get this manual
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SECTION 08 SUB-SECTION 05-02
M175 T1 W240 MZ1 W260 MZ1 W280 MZ1 W280 W280 NGK W280 MZ1 MZ1 A-8 MZ2
M175 T1 W240 MZ1 W260 MZ1 W280 MZ1 W280 MZ1 W280 MZ1 M260 T1 W260 MZ2 W275