I have an '05 kfx 400. It starts up with the choke but shuts down immediatly when i turn the choke off. If i apply the gas it shuts down. I have already drained the fuel, cleaned the carb completely, checked all seals and hoses. i am diein here. someone please help.

 

Make sure your vent line is not kinked its' proably not but it's worth checking I had this happen on the same machine, if thats not it sounds like maybe your valves need adjusting.