I have had my bike at the dealer 3 times now. It was running Great has less than 60 hours on it. While going forward it started to learch like it was starving for fuel. I would simply Rev it up and presto it would run good again. Finally I was getting Hot check engine on the cluster. I changed the spark plug and again it ran Great. Then the whole process started again this time though it would not idle and was still Learching. It is currently in the shop again they r waiting for a tech from Polaris to give them some ideas. Hope someone here has a couple. They say they are stumped for the moment. The Engine and all Diagnostics check out! HELP!  

My 2006 500 EFI was having the same "hot-check engine" problem when it was new. It was in the electronics. Polaris had to put a resistor on it-problem solved. As for the starving for fuel issue, I'm taking mine back (again) tomorrow. It runs great Wide open but spits and sputters at low RPM's.---Good Luck  

Mine has been in the shop since July 10th. Dealer now working with Polaris Techs. They are trying to figure this out! You would expect a little better product for the kind of money these things cost argh! Worst part is I had to borrow my dads Honda to ride!  

I had the Check Eng problem with my 06.  It turned out after the inst cluster was changed, the compute module was changed and five misc. trips to the local dealer...it was the wire harness for the factory installed hand/thumb warmers.  A wire was triping a false code.  One 4" jumper wire fixed the problem.  Good thing it was all on warrenty or ***  Hope this helps?  

the 2007 polaris sportsman has recalls.

check the link below to see the recalls

http://www.atvsafety.gov/atvrecalls.html  

Hello folks, new poster here. Just got a couple 500 EFI's in Jan. One has 28 hrs on it and the other has 23 hours (mostly hot flat land riding). Just took them to Colorado last week for 2nd Elk season. Easy to moderate climb. Very cool temps. Half way up the mountain, I smell plastic burning. Stop bike and pull seat. The entire right underside of the seat and right rear fender and the small quarter panel near the exhaust was all melted inside. Insulation tape did not appear to work at all. Engine never overheated. My brother was riding my other EFI and guess what, almost identical. Any recommendation as to who I talk to first. Thanks....