i have drz400 2000 model and i was riding it for a while when all of a sudden it started to cough and start missing. i switched fuel to reserve but that didnt help. i stopped and tried to keep the revs up but it was trying to stall and was spitting flames out of the exhaust. the bike starts and idles perfectly and it rides alright whilst going slow but when you 'up it' it then starts to miss and stalls within a few seconds. i only just purchased it and am praying its nothing serious!