1970-1979 Ski-Doo Snowmobiles Service Manual, Page 95Get this manual
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88 Table 3
346(1978) 354(1978) 354(1979) 396 401 434 436
2.3425 in(59.5mm) 2.3425 in(59.5mm) 2.3425 in(59.5mm) 2.5394 in(64.5mm) 2.5394 in(64.5mm) 2.6575 in(67.5mm) 2.6575 in