Mine will tick over all day at about 2000 and go to full power without hesitation. The carb settings are pretty much factory. Beginning to trust this little engine a lot. My first venture into gas. It is on a Funtana 90 and getting stronger every flight. Mine has very low vibration, a lot less than the Saito that was on the plane, VERY pleased. I don't like the way it eats batteries, but I charge about every two flights just for peace of mind. There is another thread where a firm in England sells a small, light lipo for this engine. They claim it will run engine 70 minutes. I think if a g20 wont run pretty well at factory settings on the carb there is a problem that twisting needles is not going to fix. BTW mine idles so low that it will BARELY pull the Funtana fuse on pavement. I thought about the lipo thing, but just leary of gasoline, lipo and cigarettes.
http://www.toni-clark.com/index_en.htm