I had a mini bike just like this when I was a kid, so, after searching for a long time, I found one to restore for my grandson. It originally had a 3 horsepower engine but that was not good enough so....with a bit of fabrication I managed to shoehorn a 6.5 horsepower Honda engine in it. I calculate that with the governor turned off and with a 75 pound boy driving.... it will probably do wheel stands!! I have just finished installing the drive train and I thought it looked so cool that I just had to share.