Up for sale is BOYESEN 1998-2015 125 SX KTM MOTORCYCLE RAD VALVE. The vendor part number is RAD-41C. Boyesen Engineering would like to introduce the all-new RC2 Series Rad Valve, designed to increase overall horsepower and throttle response in the Yamaha YZ250/250X KTM65SX and Kawasaki KX85/100.