I've been through all the stuff I can find on jetting in the sticky's and also search results. Im stuck once again. Thank God for TT though! I've got a 2001 YZ 426. Top and bottom end are new. Stock pipe for now. Bike starts easily but will only idle w/ the choke on. As soon as choke is released, it will die immediately, even if i try to rev it up w/ the throttle. Ive riden it very little, just up and down the street but it has to be w/ the choke on. Im trying to do some final tuning before my first ride. The carb i put on it i purchased on eBay. I replaced the jets that were in it as follows: Pilot: 42 Main: 152 Air Screw: 1.5 turns out Needle: 3rd position from top Elevation: 5500 I've messed around w/ the pilot going up and down w/ it. Also messed w/ the airscrew w/ no results. I've had every piece of the carb apart and cleaned extensively w/ carb cleaner and compressed air. Im not too knowlegable on jetting, but usually i can get by. This one is stumping me. Anyone have any suggestions?