I have a 2009 Sportsman 500 HO I bought new. I have taken it to Colorado the last 4 years, the first year it ran fine, but the last 3 it has not. The problem is when I am in a hard pull in low gear it acts like it is running out of gas. To get it to run I had to pull the vent hose from the gas tank and blow some air pressure into the tank. Sometimes there would be gas dripping out of the hose. I went to the Polaris dealer in Gunnison,CO and they said you might put another line off of the one and put one of them up high enough so no gas would come out and the other down lower so gas can come out the lower hose. The ATV IS NOT fuel injected and besides the smaller jet (147.50) the only thing I've done is put a UNI air filter on it. Does anybody have any suggestions ??? I'm going back out there this fall and ride and I would like to not have any problems. I can ride it like that but it's a pain !!