It would take a fair bit of engineering to get the JAP to mate up to the M3W, definitely easier and cheaper to get a fair bit more power fro the X-Wedge and if you really wanted an engine swap then perhaps looking to other bike engines would be the way to go?
There are various big Japanese V twins and then if you really wanted a challenge how about a Ducati V-twin or even the desmosedici?
By challenge I think I mean recreational impossibility!
