Okay, i have a 2012 sportsman 800 EFI. It has been having issues for months now, actually sense two months after purchase. It will run great till it runs for a bit and gets nice and hot. Then it will lose power RPM and die. It will stay running if i hold the throttle to above 2000 RPM but runs rough. If i get the RPM up over 3000, it will begin sputtering and backfiring. It will do this when its wet, dry, clean, muddy, dosent matter. This bike has been to two different dealers multiple times and so far i have replaced the start position sensor and the T-bap harness yet it still messes up....... some one please help. i give up and am outta ideas. The dealers seem to be as lost as i am ! ?????