I just bought a 05 yz450. The guy i bought it from said i should go through th carb because it wasnt idling right. well, it doesnt idle some times and others it does. It also pops almost constantly on deceleration. Once running it seems to run fine, with a slight bog right as you nail the gas. It has a DRD full exhaust and seems to be running a little rich. I dont really know anything about 4 stroke carbs, so i am at a disadvantage as to what to do. I will call DRD on monday and get their jetting specs, i was just curious as to what you guys might think is going on. There are no air leaks and the hot start is not getting hung up either. Any suggestions are gratly appreciated.