RE: GMS 1.20 EXPERIENCE?
I have other sized GMS glow engines. But found they seem to have turned out too many back when, and now are trying to sell at some lower cost than back the 6 years ago when they hit the market.
Only thing I found was they are sort of slow to break in. They get better each use, but only marginally better than the last time. Run them up on some sort of bench before installing permanently in to your A/C.
Early models had some air leaks around carbs, but that got fixed as I understand for mine dooes not leak.
Wm.