This is a bike that my brother and I installed a 47cc engine on. The engine is from ThatsDax, and I recommend them to you if you want to do something like this. The installation of the hardware took about 2 days, bug fixing and fine tuning took another 2 days.
TIP: The mysterious problem we encountered was the engine refusing to start. This is solved by tightening the star nut inside the clutch (before, the clutch would slip). Now it works like a charm and starts up almost every try!
Also, make sure nothing rubber/plastic is touching the engine. It gets very hot :)
My top speed is 25-27 MPH. I could go faster, but it's a new engine and I don't want it to overheat.
My fuel is 1/2 gallon gasolene mixed with about 3.5 ounces of 2 stroke engine oil.
This is just a video of how the engine runs, I'm not sure how to film it in action yet.
Knightfamily made it!