1981 Ski-Doo Shop Manual Supplement, Page 92Get this manual
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SECTION 04
247 277 377 377 377 503 464 503 503 354 454 640 464
BOSCH SPARK PLUG NUMBER
M175 T1 (M7A) W275 T2 (W3C) W275 T2 (W3C) W275 T2 (W3C) W275 T2 (W3C) W275 T2 (W3C) W275