jetski motor in 250x frame

[250xsupertrapp]

i just got a late 80s kawasaki js550 jetski, i wanna put this motor in my 250x frame, right now it has about 40hp stock and is a 2 stroke, when im done i want it to have around 75-100hp, the problem is i need to find a tranny or clutch

[1 Slo 300ex]

Marine engines produce such high output because they have lots of cooling available. Won't it be difficult to keep the motor cool, especially if you're trying to double the stock HP? A big radiator and a snowmobile centrifugal clutch setup would make a pretty crazy drag quad out of that if you could keep it cool enough. good luck