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04 crf450r no idle, starts hard.

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i recently traded and got a 04 crf450r. it has a 490 big bore kit in it. when i go to start it it starts really hard, even when its warmed up. once its running it wont idle. it will rev up and down.and the idle will hang there for a sec sometimes before coming down. the idle adjustment doesnt help. i have a couple of thoughts but maybe you guys can get me straight.

is the bike running lean causeing the rough idle? either due to hot start or air leak. and could this cause it to start hard? or do i need a valve adjustment to fix the starting issue? i thought that the bike should start up easy even with out of adjustment valve once its warm but maybe not.

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