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Message: [QUOTE="Rocked250, post: 1435592, member: 125021"] I just bought a 2001 yz250f and it is pretty hard to start. gotta kick it many times almost flooding it out before it fires up. After it fires up it will not idle on its own. and back fires up when it reves up. not bad but crackles pretty decent.. Then I noticed the header gets a little hot. So I started messing with the air fuel mixture screw. I got it to idle and purr nicely and most of the backfiring is gone and starts easier. But now the header starts glowing orange from the head almost a quarter way up the pipe in less than 4 seconds.. bike is supposed to be stock except the air filter and the fmf exhaust an header an does have a new carb on it. This is the first dirt bike ive owned since I gew up on atvs.. addicted to the two wheel world.. [/QUOTE]