2015 POLARIS® RZR® 900 WHITE LIGHTNINGPower FeaturesNEW! 75HP ProStar® ENGINEJust because the RZR 900 is 50" wide doesn't mean we skimped on the power. It features the same class leading 75 HP ProStar® engine as the RZR S 900. With hallmark ProStar® features like dual overhead cams, 4 valves per cylinder and electronic fuel injection we've upped the torque 14% and increased HP by 40% over the RZR 800.