I can tell you that a yz250 is nowhere near 43 hp, but I did own a 97 yz250 with a PC pipe, KN filter, and a 38 PWK airstryker carb and I could eat up my buddies on there mildly modified banshee's a 450r all day long. That was on two wheels, but I'm guessing the blaster doesn't weigh a whole lot more than the bike did. It's a real strong motor and that was just minor mods, no porting or anything. It would be a nice swap and would easily fit. There also a dime a dozen on ebay. Should be able to get a whole setup for around 5-6 hun.