Hello I have a street legal plated 2000 wr400f former woods racer I'm looking to do a a complete rebuild/supermoto set up I stumbled across a 2001yz426f with a 444cc big bore kit and a blown 4th gear I already have a reliable Drz to ride as a commuter the wr will be a "fun" bike with the occasional track day basicly. What fits what ? And what's the best parts for my intended use like is the wr trans better ? Is the yz trans prone to problems ? Will the yz top end work on the 400 ? Wich forks should I use ? Here are some pics thanks for any help .