new to this forum, dont know if it is the right place to ask for help. if not, mod please move this post to where it should be. thanks. the bike is 06 gpx250. havent riden it for 1.5 weeks, still on my L. M.O.S.T is booked on next tuesday. just went out and tried to practice the riding skills. fully opened the choke and start the engine, all seems ok. then push the bike out of the parking lot, and put my helmet and gloves on and then sit on the bike (about 2 mins). also tried to turn off the the choke. as soon as i did this, the rev dropped back to 1-2k quickly and sounded not good. open it again. just played arond it a while....then the rev just spontaneously dropped back to 0, aka stalled! even though the choke is fully open. restart the engine, the rev just kept dropping back and stalled after a few seconds. if i tried to add a little throttle, the engine shut down immediatly. after a few times (and also leave it for rest a few minutes), now i just cant even start the engine. checked the fuel tank, still some liquid swing around inside. dont know anything else to check or to do, i am not mechanic mind at all. please throw me some ideas. thanks in advance.