This is my new bike, built 100% by me from parts its a 3.4L gas bike frame, 85cc 2 stroke engine, MZ65 expansion pipe, and 21mm carburetor.The 45mph top speed was from attempting to tune the carb at 30f today,I have had it to 49mph when I let off because I was worried about blowing it up. I still have stuff I want to upgrade and I'm realizing I'm never going to be done. Eventually I want to weld my own frame and build my own 1920s style motorcycle.