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The VX750 Snowmobile engine has nothing in common with the TZ750 design, its was a completely new engine based upon much more modern thinking and with no interchangeable parts between the two designs

Unfortunately it didnt, and there are absolutely no common parts between the two engine designs. The VX engine displaced 743cc from a bore and stroke of 63mm by 59.6mm while the TZ 66.4mm bore and 54mm stroke. So completely different from the TZ race engine which by 1991 Yamaha would consider...