I have a 2004 1/2 sportsman 700. I will be driving down the trail and it will all of a sudden start bogging and then quit. It will onlt run for a few second after and thats only if i choke it. After this happened a few times, i tried making a seal with my hands arounds the fuel cap and blowing into the gas tank with a little force. When i do this, its fires right back up and is good for another 15 min of riding before it acts up again. anyone have any ideas on what is causing this? Thanks

 

are all your vent lines clear and not pinched. sounds like a lack of vacume.