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I bought a 2005 Polaris 800 Efi with only 1600 miles on it. Everything was great until lately when the engine runs rough when the motor gets warm. Changed spark plugs, air filter, fuel filter, oil, and fuel pump. Can someone help out with what might be wrong. I am getting frustrated with this problem. Thnx again!
 

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WELCOME!!

Have you flushed the radiator (Installed fresh fluid) and made sure its clean with plenty of good airflow? Mud can cake the fins of the rad stopping airflow and causing overheating problems.

CW
 

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Pretty common problem. Sounds like a wire going to the tmap has pulled loose in the harness at the plug

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