The horsepower ratings between an R1 and a busa arent all that different. They are both wicked fast street bikes, and would make insane powerplants for a quad. Ide opt for the R1, keep it yamaha...even tho Im a kawi fan when it comes to sportbikes. If you really want a head turner drop a ZX-10 engine in her and paint your plastics lime green.
The FAA... not happy untill your not happy
04' Red/White, Full FMF, jetted, K&N cone, YFZ's, ITP T-9 wheels
78' Sierra Classic, "Built" 350, TH350, True Dual Flowmaster 40's
06' Sierra SLT, Leather, Bose, 20's wrapped in Yokohama Avid SUV's...SOLD
Lets keep this post alive. I am wanting to do the same thing. Considering going to junkyards tomorrow to look for a hayabusa. What I need to know is whether a certain year of hayabusa would work best for my 2007 raptor frame? Always best to start with a near fit rather than trying to fit a square peg in a round hole!
I have always been a suzuki fan when it comes to street bikes. but if it was my choice, i would like to see a raptor with the new 09+ R1 motor. it has a new crank design and fireing order. it makes gobs of low end power and awesome top end power. its just a monster everywhere!.... i think it would be an awesome motor for a quad.
a busa quad would be freaking crazy fast too. i just assume the size of the motor is a little bigger then an r1 motor, so would cause for more fabrication. I have a built 05 gsxr750 motor that im debating putting in a quad or building a single seater buggy for. good luck with all your builds!