Well this bike is another replica using an original engine. It's a 1920 Evans Power Cycle. In the teens it was sold as a bicycle engine kit called"Cyclemotor" later was sold as a light weight motorcycle.I was given the engine kind of as a joke because it was in such bad shape. he thought of it more as a door stop. It took me a year just to get it apart. for its day it's a very tiny two stroke about 100cc I think rated at 1/2 horse. and it feels like 1/2 horse too. on level ground it might get up to 20 or 25. speed is best regulated by changing the spark advance. direct drive, no clutch. Pedal it to start the engine, and pull the compression release to stop.