Such Advanced Engineering, It Feels Like Cheating. With a bit of forward thinking, our engineers redefined cross-country riding and gave the pros a machine that takes the prize time and time again. And it has. Together the REV chassis and the Rotax High Output (H.O.) engines have distanced the MX Z from the rest of pack. Now, the REV-optimized and snocross-proven SC-4 suspension further improves performance and handling through the corners and during acceleration. Add a set of new Pilot skis up front and this expert bump sled brings championship performance from the track to wherever you roam.