I've got a 2000 Super Sport that is low on power on the top end. It's a stock machine with no extra goodies. It goes like hell up to 45mph then just tails off. It revs about 6500rpm - just won't go any faster. I'm going to check the air/fuel mix today because my plugs seem a little dark. I've ordered a clutch rebuild kit in case that's the problem too. Any suggestions that I might not be thinking of? Any help would be greatly appreciated.