1978 Ski-Doo Shop Manual, Page 357Get this manual
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SECTION 08 SUB-SECTION 05-02
340 6500 Plus 640 ER 450 LC
346 440 345 354 640
W260MZ2 M260 Tl W280MZ2 W340S2S M240 Tl W260MZ2
W260MZ2 M260 Tl W280MZ2