2003 wr459f does not run clean off idle

I have recently aquired a 2003 wr450f. It has very few miles on it. The previous owners were of questionionable mechanincal skills based on some of the things i have found.

The bike has recently been down the Baja, I followed the rider so I know it does run but now that I try to ride it, it does not idle well. It will start but revs and does not come back to idle. After the throttle is closed it continues to fast idle and buck and put up a fuss out the exhaust. I would like to think it s lean but the I checked the jetting from stock specs and found nothing amiss. The exhaust and jetting is stock.I have not opened up the top end to check the valve clearence. That's on tommorows list.

Anybody have any ideas?


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