2007 Polaris Sportsman 500 EFI missing badly.

[FordGuy79]

Wonder if anyone can help me out. My buddy had an 07 Sportsman 500 EFI that is missing really bad. It's so bad that it almost throws you over the handle bars when you try to ride it. We all got gas from the same place so thats out and we pulled out the spark plug and it was really clean. The only changes that have been made are a radiator relocation kit and shorkel kit. We thought maybe it was getting to much air but we covered the shorkel intake and still the same thing. Any ideas?? Thanks

[DirtDemon]

Did the problem start immediately after installing the snorkel kit? If so, it probably has something to do with the problem. I would either get an aftermarket fuel controller or take it to a dealer shop and have them adjust the ECU to compensate for the difference in airflow. Fuel injected quads can be very tempermental, I know that one first hand. One of the best things I have done is add a fuel controller. Now when I make changes, I can compensate for them by pushing a couple of buttons. Also, you may not want to rule out he possibility of his gas being contaminated, there could have been some crap in there before hand. Also, check the fuel filter, it could be getting plugged up.