Here is my old 45 racer, this is the one I got hurt on, in the spring of 2015, crashed, had a head injury, broke my new helmet, broke my back, had 5 vertibre fused together.
The motor has KH flywheels in it(4 9/16 stroke) Hehe, ball bearing bottom end, everything has been breathed on inside of the motor, it rips.