Polaris Sportsman 400 500 600 700 800 Hall Effect Speed Sensor 4040081 4010298 Polaris ATV hall effect speed sensor. Robust black anodized aluminum housing Works on most 1999-2010 Polaris Sportsman's Replaces Polaris part #4040081, 2201625, 4010298 Please Read Full Product Description Below To Check Fitment.