1981 Ski-Doo Shop Manual Supplement, Page 54Get this manual
SECTION 03 SUB-SECTION 04 (CARBURETOR)
MIKUNI CARBURETOR
For the following 1981 models:
247ElanSpirit 277Citation 3500Mirage 377Citation 4500EMirage IIiE 377Citation SSMirage Special 377Nordik 354Blizzard 7500Super Sonic 454Blizzard 9500Ultra Sonic 503Blizzard 5500Grand Prix Special 503Blizzard MXGrand Prix MX 464Everest LICFutura LlC 503Everest 500EFutura 500IE 464Elite 464 LIC 640Alpine 640 ER