Did the same bought a mini bike at garbage sale $50 bucks. 3.5 hp tecomsei was burnt hopped her up put 5 hp Briggs in it boys rode the wheels off it. After they were done with it I sold it to one of my pals for transport back and forth to staging lanes.
Bought mine new about 17 years ago and my young kids drove it in the ground and then the grand kids drove it till it fell apart so newer engine and a repaint so the next batch of grand kids can destroy it. lol