I bought a G5 recently & tried it initially in an old Leo 46, I was amazed at how easily the Leo started. It ran well at WOT but the idle was not very reliable, however I will persevere.
I also have an OS 120AX with a Morris Minimotors petrol conversion, which runs as well as anyone could want. I tried this with the G5, again great at WOT but the idle needs adjustment to the carb which I do not want to do.
For £7.99 & some 2 stroke mix the G5 has to be worth a try.
Tony