Greetings almighty TT'ers. I have a '02 YZ426 that the motor gave up on me about a month ago. The cyllinder was considerably out of spec so i planned on replacing it with another stock one til I found a 444cc big bore kit in stock at a local shop. I've read all previous posts about reliability, performance, etc. but haven't seen if any other mods or upgrades were necessary. Currently i'm running the stock exhaust (eventually want power bomb SX header), YZ450 cam, BK mod, blue wire, Ready Racing air filter, but wanted to see what anyone else had to do to get the bike running optimally. As always I appreciate the knowledge, wisdom, and experience this group has to offer.