I've seen a couple of threads where guys are spending 5 mins to check their valves. I havent opened the motor on my 01 426 since I bought it new. It starts on 2 kicks and no smoke, bike just runs great. I need some help. I cant really tell if the bike has slowed over the past year or two or if I'm just needing more at the track. I'm debating spending $500 to have the motor freshened w/ rings and polishing. I read the thread where guys read an article by Gorr(?) and they all cracked open their bikes only to find everything was fine. I'm not much of a gearhead and cant screw up a great running bike. I'm thinking a pipe might help too. But again theres $500 bucks that could go to a fresh motor. I cant have my bike blow up this summer cause I missed something. How can I confirm whether I need a top end or if I've lost power; rather than spending $500 bucks only to find out the bike ran just as good. As always, thanks for the advise. You thumpers rule.