I just picked up a beautiful 08 KX250F a few days ago!! Everything is in good shape, motor has a lot of compression, shock linkage bearings are all good with no play, steering bearings turn freely, wheels spin freely with no play, clean, almost no marks on the engine cases and frame. One dilema, it will only run with the choke on. If I turn the choke off it needs about a quarter throttle to keep it running. The guy said it was a magazine test bike for DIRTBIKE and he bought it a few years ago and only has ridden it a few times and it sat most of the time. It has been sitting for a year since it was last started according to him. He said the carb needs to be cleaned. Are these symptoms of a gunked up carb?