polaris was recalling the ecm's, go to a polaris dealer with vin number and see if your's was done or even part of the recalled atv's.
if it's on the recall list and was never done it will be replaced for free
07 sportsman 800 mine 3000 mile's
08 rzr 800 wife's 2700 mile's
06 sportsman 500 1000 mile's for sale
98 ski doo touring 500 wife's 125 original mile's
98 ski doo formula dlx 583 mine 125 original mile's