Your Scrambler 1000 Tractor 2018 YM is limited to 60 km/h. The Electronic Control Unit (ECU) MCECUA18SVS953 will allow you to reach a maximum speed of 80 mph (128 km/h) which will allow you to perform during racing events. The 3 mode button will allow a stronger accelaration (in mode "performance" - good for starting the race) or a lighter accelaration (usefull in Trial situation).