1985 Ski-Doo snowmobile Service Manual, Page 208Get this manual
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Section 02 Sub-section 11
ENGINE TYPE 247 253 377 Safari 377 IE Mirage III 377 SkandlcR 447 462
MIKUNI NOVM 28-242 VM 34319
VM 34-309 VM 34276 VM 34310 VM 34-334 MAG VM 34321