Had this project build in 2016, completly rebuild. I put a X30 NG-2A engine in the Maxi frame (not much to do, just some minor side cover cutting and a little modification at the pipe), the engine is basic a normale ZA50 with a cooling fan, and the diameter were the cylinder enters the engine is not the 47mm that we usually have but 45 (if I remember correctly). Was cool to cruise with, had a top speed to abouth 45 km/h and a great push. Was made to' be sold, so I did.