Mar 26, 2014 Kart KF 125 cc motors, and the orange. line is a direct drive set of cases with. the GP 125 cc cyl, no PV, and a basic. ign, running on VP 113, and a roadrace. pipe. Obviously adapting this cyl to a YZ 125. bottom end will have some setbacks, and power losses, but even if it. ended up with 40 to 45 hp, it would. be am improvement.