I had one of these years ago and as I understand it there is an updated design now. Back then I used a Saito 125 with the stock mount and it reall flew pretty well best I remember and from my own flight report in this thread.

I quit flying glow years ago and have a few extra Zenoah 20's laying around. The Saito 125 engine and muffler was just shy of 25 ozs plus the weight of the heavy plastic mount.

The bare Zenoah is 29ozs plus about 2 oz for the muffler but I won't need the motor mount nor would I need to carry as much fuel. The ignition also weighs 2-3 ozs but with today's Life batteries with two leads the ignition battery and the flight battery can all be the same one.

So what I am trying to say is I have been thinking about getting another one for one of the extra Zenoah 20's I have not being used as a cheap knock around plane and I don't think going gas will be a significant weight gain over glow.