I bought this bike about 7 years ago and it promptly blew up 1 hour into the first day. I repaired the top end, piston and all associated parts and rode in a couple of events when it blew up again with less than 10 hours on it. Frustrated, I was ready to part it out but, instead, I put it in the back of the garage and continued road racing. About 18 months ago I replaced the damaged cases with some eBay units and replaced the top end with new parts. The bike has run great ever since. The suspension is stock and original with the only changes being a Rekluse clutch and '03 decomp cam.
The moral of the story? I guess it is that, while the new stuff is very nice, don't discount the older bikes ability (whether it's a 426, or older 450) to hang in there with the best of them. My bike is not pretty but it starts first kick when hot and one or two kicks when cold.
Here is clip of this weekend's 50+C race. Dead engine start.
Edited by MNellis, December 03, 2012 - 07:26 PM.