I have a Polaris Ranger XP 700, fuel injected, It has 160 hours on it. My problem is fouling out spark plugs. It runs great for the about 30-60 minutes, but then it will start to idle rough. I shut it off and pull the spark plugs and they are black. After cleaning them again, it runs good for another30-60 minutes. It is a completly stock unit. I have changed the spark plugs, fuel filter, air filter, cleaned the trottle body and air ducts. Nothing has worked!! I have also taken it in to the Polaris dealer, who said that it did not show any codes. He replaced the spark plugs again. I still have the same problem. If anyone else has any idea's, they will be greatly apprechiated.

Thank You,
Greg