My CRF450R 2007 was always hard to start. When it got hot forget it. You would have to bump start the bike. I talked to Randy at FastMann Racing and told me it was a rich condition. The valves were very close. Sometimes on the starting gate it would not fire (well 3 times but it &^%^$ed me off). I gave in, and had him DYNO tune the bike. Well all 7 or 8 carb circuits were rich. You know from closed to wide open throttle. He changed everything. Now the bike starts 1st kick 2nd when hot. . I greatest thing is the increased power and instant throttle responce. He used the Dyno to clean up the jetting. The main is around 165 ish. Sorry I forgot to get the spec's, but that would not help anybody else's bike. They are all different. My bike went from getting sold this fall to the pride of the fleet. Anybody who can try a good Dyno tune & you will be a believer also.