I have a 1998 Polaris Sportsman 500. I recently bought it used from a family friend for a hell of a deal. I have put all new fluids in and cleaned the bike up pretty well. For 1200 miles it is in pretty good shape. Here is the problem. Everything runs fine and I have been riding it nearly everyday. It starts up fine gears work shifts well from N to D and R. However when I am riding the fastest the bike will go is around 28-30 Mph. I am certain that this bike being a 500 has to have more power then this. It accelerates pretty slow and almost feels like it has a governer around that speed. I have checked under the throttle and cannot find any sort of physical governor however I could be wrong. A governor could not be the problem. Seems I am loosing a whole lot of power somewhere. Yesterday I was riding up a steep hill and it almost seemed as if it was struggling to climb it at full throttle. Any Ideas/ Suggestions on what I could check? I was thinking my next things to check would be fuel lines/ Carb and then air flow.