I have a A&J 1.8 on gas. It has a C-H syncro spark ignition. It has always been real good. It appears to have a G23 glow carb on it? It turns 18-8 a little above 8000. To my knowledge, A & J is out of business or at least out of the model airplane engine business and the literature you received from C-H was a couple years old? As far as I can tell from mine, the engines are very good but they cost quite a bit.

Enjoy,

Jim