I was on the web and found a web site. www.powroll.com. they will stroke a trx 450r motor. It talks about better mid range power like a big bore kit but with out the reliability problems. I s this true? Do you loose any throttle responce or top end pull? what about cost of this verses a big bore kit? I think said and done website said around $400. Any info on this? haven't rwally seen anything on stroker kits.