I would not want a HS 142f mounted to a GEBE. Too Heavy and it is made in China. If you need extra power over a 30cc 4 stroke. Mount a Tanaka PF 4000. That is what I had mounted to it on my Trek GEBE.
I got the Golden Eagle Bike Engines (GEBE) kit in the mail the other day. I got it off of ebay from a guy that only put less than one hour use on it. I took some pictures before I install it to show people the simplicity of the kit.
Got the bike. Just picked it up. A rare find indeed. It is an Electra Townie 21D with front shocks. Electra does not make there bikes anymore with shocks, so I made out. Here is a pict. of it before installation of the GEBE kit.