I converted one of those many years ago before we all started with the Gas/Glow concept. I just ran it on gasoline with a CH Ignition system on it. I can't remember what the rpms were, but it flew a 10 lb. airplane fairly well. Not the way overpowered, 3D type power by any means, but it flew and could do aerobatics.

I do a lot of 21 to 26cc Echo engines, as well as Homelites, Stihl, etc. Any time I can, (which you can with all the small Echo engines), I just use studs in the back of the engine and mount it directly to the firewall to save weight.

By the way, I know the little 16cc engine is cute, but the 21 and 24cc Echo engines only weigh slightly more, but make a lot more power. All the Echo engines I have converted to Gas/Glow worked out very well.

Nice work, congrats, and have fun,
AV8TOR