Well, a few years ago I bought my first Recumbent Trike. A Sun EZ-3 USX HD Delta Trike. I ended up putting a 4 Stroke Honda GXH 50 with friction drive on it and it did great. Unfortunately, I had to leave my Trike behind for I have moved out of the USA to France. I am currently thinking of putting a Grubee 80cc (66cc) SkyHawk Bicycle Engine Kit on a 22" frame mountain bike. I am having to order from the States because I can,t find anything here in France. If anyone has any suggestions please feel free to respond. There is a lot of good info on this board. Thanx for listening.