The 800 RMK Assault 155 is a backcountry mountain snowmobile built for extreme conditions. The tough-as-nails sled, featuring Walker Evans Needle Shocks, is perfect for dominating cliffs and jumps. Customize your sled with exclusive color combinations during SnowCheck 2019. Instantaneous Lift Patented Raised AXYS® RMK® Chassis: The AXYS® RMK® features a patented, raised chassis that increases clearance and reduces drag to keep you on top of the snow. This AXYS RMK chassis, purpose built for mountain riding, allows for improved sidehilling, faster and easier climbing, and instantaneous lift allowing the sled to pop onto the snow faster. The aluminum overstructure is lightweight and durable for all types of riding. Taller spindles increases clearance to reduce drag. Rear Suspension: The lightweight, rigid rear suspension design features revised geometry to control pitch. This improves weight transfer, delivering better control and a more compliant ride. The rigid suspension delivers power directly to the snow. Off-trail, riders will notice improved weight transfer while maintaining the approach angle. On-Trail, riders will notice a more compliant and comfortable ride. The rear suspension features a rail design that helps lift the rear skid while driving it forward. 800 Cleanfire® H.O. Engine: Developed in conjunction with the AXYS platform, the proven 800 Cleanfire® H.O. Engine delivers class-leading acceleration. The integrated mounting position optimizes the balance of the chassis. Featuring: 3-stage electronically-controlled exhaust valves; Electronic oil pump; Thermostat with bypass warms up to operating temperature 40% faster and improves durability; High-efficiency intake and exhaust; VForce Reeds; Lightweight crankshaft; Throttle body is lighter weight and reduces throttle effort; Grooved Piston Assault Track Options: Assault riders have a choice between the Peak 2.25" and the Series 6 2.6" track. The Polaris exclusive Peak 2.25" track is the ideal track for mixed hard pack and deep snow conditions providing impressive traction and control. The single-ply design features a stiffer lug base with flexible tips to provide a hybrid of speed and flotation. The Polaris® exclusive Series 6 2.6" track provides the ultimate all mountain performance. The new lightweight track is designed for improved deep snow and hard pack traction and better lift. Chaincase Drive System: The Assault uses Polaris' tried and true chaincase drive system, which delivers the perfect combination of strength and performance for cornice drops, jumps, and attacking any terrain.