I have not used this site in a few years. I have the GEBE 40cc and the Robin 35cc 4-stroke motorized bicycles that are still running great.. I added a GEBE 32cc last summer. I also still have my ch-70cc with the SBP shift kit that runs just great still. I have a GT-2 bicycle with a 4-stroke 49cc engine with the EZM silent drive kit ... that I like a lot also. I want to add a 4-stroke GT-4 kit with a SPB shift kit...so I am here to read up some threads on this build.