RACE SLED PERFORMANCE FOR YOUR TRAILSYou don’t have to be a racer to appreciate the incredible big bump capability and cornering precision of the Ski-Doo MXZ X-RS 850 E-TEC model. It's the perfect sled for an intense Sunday run over rutted out trails. RMOTION 129 REAR SUSPENSION: The standard for control, capability, comfort and adjustability – with added traction, better braking and more bump filtration in 129-inch (327 cm) version. Separate spring and shock dynamics, plus the most rising-rate/progressive motion ratio in the industry give the rMotion suspension its supple ride in small bumps with added capability in large ones. Easy adjustments for shocks, springs and coupling block. ROTAX 800R E-TEC ENGINE: Direct-injection technology mill pumps out big power while delivering up to 19 mpg (12.3 L/100 km) fuel economy. Excellent oil consumption, plus easy throttle pull, linear power delivery and virtually no smoke or smell. Proven and recognized by riders for reliability.* Preparing for the off-season is easy with built-in automatic summerization function. REV-XS RS PLATFORM: REV-X base architecture and design sets the standard for light weight, durability and handling, especially with the same chassis modifications as the MXZx 600RS race sled – including wide, strong running boards with extruded edge. Driver can stretch their legs due to forward foot position. Layered flowing edge REV-XS body style is aggressive and sophisticated with excellent wind protection. The steering post can be moved forward to create a very aggressive position for stand-up riding.