The 600 RMK 144 is a great 50/50 crossover snowmobile. It is for riders that want deep snow maneuverability with Rider-Balanced™ on-trail confidence. Rider Balanced Control Rider-Balanced AXYS® Chassis: The AXYS chassis for the 144 platform is light and strong, offering rider balanced characteristics critical for the 50/50 rider. The rider is moved into a balanced position on the sled so it rides flat through the corners. When the trail gets rough or the rider jumps off into the powder, rider balance enables the rider to move back and make the front end light to climb up on top of the snow or the moguls. IGX 144 Rear Suspension: A core element to the AXYS 144 platform is the IGX 144 uncoupled rear suspension, which offers the ultimate blend of durability and strength. The IGX 144 rear suspension provides RMK-inspired off-trail agility and balance with a drastically improved on-trail ride. Pitch is controlled through geometry in this rear suspension. And with 43% more front torque arm travel, this sled features reduced bottoming and less drag off-trail. An optimized, lighter, tipped rail beam design gives the sled a nimble feel. PowderTrac™ Hybrid Running Boards: The PowderTrac Hybrid running boards offer optimized design with 56% open space for maximum snow clean out while maintaining extreme strength. Designed to serve the needs of riders on- & off-trail; Efficient design delivers maximum strength & snow clean-out with 56% open space; Front is wide & flat for foot comfort & stability; rear has tapered, dual-angle design for mobility & snow clearance Unrivaled Acceleration Lightweight: At 455 lbs, the 600 RMK 144 on the AXYS 144 platform is lightweight yet strong. It allows you to get up on top of deep snow faster and offers quick acceleration. 600 Cleanfire® Engine: This liquid-cooled Cleanfire® engine with semi-direct injection (SDI) delivers outstanding throttle response and instant acceleration. These powerful, efficient engines start easily and reliably and they calibrate automatically as the temperature and elevation change. These engines deliver impressive fuel economy in real-world riding situations, which, for Polaris riders, means aggressive, up-tempo riding, not low-rev lab conditions. In the AXYS® chassis, the 600 engine features lightweight integrated mounts, electronic oil pump and bypass thermostat.