I'm about to roll 10k on the clock. I've done pretty well to maintain the chain and stuff. done a few oil changes (every 3k) so i've got a question, i run my bike pretty hard and i've never done a valve job... am i screwed? Do i need to take care of that soon or am i still doing ok. when it gets cold out (32F and under) my bike will have a dead spot from 3000rpm to about 4200rpm... is this a sign that i need to do this. Should i be tuning my carbs? I dont have a manual to tell me this stuff so someone help me out here, what do i need to do and how soon do i need to do it.