Hello. I have seen the picture of your friction drive moped and would be interested to see some more detailed pictures as well as the name of the manufacturers. I have one of these engines but not the fittings or tank so looking to restore. Hope you can help. Mumford@btconnect.com.Friction drives, like all driven bikes, have their positives & negatives. I like them & they are probably the oldest form of adapting a motor to drive a bike. A pix from a friend's bike is attached. The biggest thing I like is you can choose from several great & reliable engines for them. You don't need a big, powerful engine on them. I would suggest reading ALL of this long thread to see some bikes before starting your project.