Don't forget, Powroll builds the parts that go into the BBR race-winning engines. I'd give them a call, or check out their website at
www.powroll.com
BTW, EVERY major Minibike m/x in the last 4 years has been won with bikes running Powroll parts. Langtown, White Brothers World Minis... Jimmy Lewis, Lance Smail, Rich Taylor, Brad Hagseth, Bob Langin, Guy Cooper, Rick Johnson,etc, etc. All these guys run Powroll mini engines & parts!
Anyway, I just thought you might like to go directly to the source!