I have an OS BGX (2.13) 35cc in a 14lb. 28% Extra 300s. It's one of the best engine/airframe combinations I have ever had. It swings an APC 20X8 at 9K RPM on the ground with a Slimline Pitts muffler and is totally reliable. The only downside is the same as the Moki's. It drinks a 24 oz tank right at the 10 minute mark. But hey, all big glow engines drink lots of fuel.

John