The Scrambler 400 X gets the same 398 cc, four-valve, single-cylinder, liquid-cooled, DOHC engine as the Speed 400, along with the exact same state of tune. The motor makes 39.5 bhp at 8,000 rpm and 37.5 Nm of peak torque at 6,500 rpm and is paired to a 6-speed gearbox with a torque assist clutch.