I have on 02 426 that runs awesome, no smoke, no bog , it runs like a beast. The jetting is dead on for performance! With that said, how come this bike fouls the plug after every ride? The plugs are completely black and the bike won't start until I put in a new one. Then it runs awesome and it will eventually foul the plug again and again and again and again. I don't notice any abnormal oil consumption that might contribute to the problem. Don't see how it can be a jetting problem when it runs so good! HELP!