You can get a Trinity motor kit (stroker + overbore) for banshee that pumps out 97 hp. You will never get a yfz motor to pump out 97 hp.

 

103.....90+


It's a challenge getting a YFZ into the 60+ range.

But if you want to have a chance you need to drop the weight as much...get rid of anything not needed.....Finishline Racing has a YFZ at 220lbs wet.

Then build the motor for drag....508 with all the goodies(including nos)....then hope the banshee misses a gear or two.

 

nice bike yamaha660

 

ha, this is awesome good luck getting your 450 in the 70hp range, it is possible(if money isnt a object)
first off drop some serious weight off your 450, atleast 75lbs...lol good luck
then bore and stroke is to a 502+++cc, check my pics
at this time nitrous would help,
and the addition of a KMS turbo will acheive the goal

be then you run into the problem, say bye-bye to your clutch, the the KMS will ruin it, and everything in its path. or just wait a few years till they come out with a lock-out clutch for the 450. either way bro i wish you luck.

 

Wait till you see it in about 4 weeks.....[img]i/expressions/face-icon-small-wink.gif[/img]

 

470 big bore kit, nos, minus 6 flywheel, and a longer swing arm

 

kool yomama....thanks doode