1970-1973 Ski-Doo Snowmobiles Technical Data Manual, Page 40Get this manual
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1973 MODELS CARBURETOR ADJUSTMENT CARBURETOR SPECIFICATION CHART
247 247 248 249 302 302 337 338 401 401 434 337 294 343 435 346 396 640 434 640 434
HR 73A HR 133A HR 136A 2x