I bought a 2005 WR450 and it ran great the first few times. This season, took it out....float was stuck. Took the carb apart, cleaned it...figured might as well put the AIS removal kit on. Put it all back together, starts great! Load her up for some riding, wont start when I get to the desert....ugh! Pull the plug, cuz shes all flooded, kick out the extra gas...she fires up! The, like the exorcist, she spits gas out the airbox return pipe (of course my idle screw position was all jacked up). Tone down the idle screw...the spewing stops. Throw on my gear, cant get her started again. Pull the carb again (friends say the needle and seat are notoriously bad on WR's) clean her up. Starter wont turn...so I kick. After figuring out I need to go full throttle to even get a chug, she starts..... great! But now the exhaust is smoking at the headpipe connection and end. Get the idle set, she dies after 2 minutes (and after all the bolts are back in of course). Now...She wont turn the starter (relay just kicks), and wont start... Any clues? Please help!