The Kit installation was straight forward with very good step by step instructions. I would road last years model a few times in varying track lengths and after riding this one the other day I felt the new model out performed last years. The new kit transfers better and has a higher degree of oscillation. I was debating a 129 or a 137 track. After riding this last weekend I'm glad I went with the 137. I'm 6'4'' and have a riding weight of about 275-lbs. Still doing some dialing on the setup but am very stoked with the kit and look forward to a fun filled winter. 2017 Yamaha YZ450FX1; Moto-Trax 137" Mountain Kit; Ice Age 6-LED headlamp w/bar mount; Thermo-Bob thermostat bypass; Hot Grips; Seat Concepts Gel Foam seat w/1/2" extra foam; 30mm bar risers; Cycra Hand Guards; Devol Radiator Guards.