Your SCRAMBLER XP 1000 S '55 Tractor is limited to 60 km/h. The Electronic Control Unit (ECU) MCECUA21S2S95T will allow you to reach 90 HP and a maximum speed of (125 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 - duo riding or renting activity)