Got the gas/glow WORKING. The top end cleaded up but the idle is another problem. The butterfly in the carb does NOT have a notch cut in it at the idle outlet. I have had this problem in other carbs so I filed a notch. The idle improved quite a bit. I will try this on my G/G engine.
Changes to the 25cc;
1- cut .030 off the bottom of the cylinder, There is about .030 at the top (by the solder measurment).
2- Used a modified stock muffler with two 3/8 od pipes with the innerds removed.
3- used the 33/66 mix. The fuel looks like it is trying to seperate.
4- OS #8 plug
Back to the carb. I opened a single needle carb for another (2 bolt) Weedeater 25cc. It is now .350 +-. It would not idle low enough to fly so I filed the above mentioned notch in the brass butterfly and got an idle. This engine has had the cylinder cut on it and has about .025 on top. With muffler it turned my 16/8 APC at 7700 rpm using the intake manifold with the rear facing carb. The muffler is home made from 1/8" aluminum and the bottom of a seamless soup can. It gets laughs but at 2 oz +- I don't care. You can braze the steel can. The 16/8 APC is the base line prop for all my engines, no special reason, I just had it when I started.

Check this picture!