I have a Polaris Sportsman HO 500 2009 . I bought it in Oct. 2011, less than 1000 mi. the guy said he never had a problem. Well, first time out, hit a higher elevation and it boggs down, uses lots of gas, has no power. Had it to a Polaris dealership in Idao 2 times with no results. They changed the air filter, checked the carb, put in a new spark plug, loosend a valve & it still does the same. I am taking it back in , this time they are going to install a new jet for 10,000 ft. If this doesnt work, I will be selling it and getting anything else but a Polaris. Second one I have had , major problems with both.