I kinda hate this frame, it had Garelli quill stem forks on it when I got it, and no matter what I've replaced them with (currently Tomo ebr's), it still feels wonky, but whatever the motor is tits. Just your normal V1 bottom end, but Im using a BRN with a 1mm base spacer, it starts like a dream and is super quick, the pipe is an old Chad Burke special, they were making these things in the early 2000's and he snagged a few, it has an adjustable boost bottle to change the power band, and change it, it does. This thing rips off the line and still manages to hit 48mph with a circuit.