Very interesting experience with this one. I purchased the G90 intending to install it in a Graupner Extra 300. Short story was I got a tremendous amount of RFI and was not able to use it on a short fuselage plane. So I decided to install it in a 60 size stick. No RFI, plenty of power, BUT.... I was completely unable to tune the carb to idle or run at top end. During the carb struggle I noticed that with enough prop wash past the carb and over the CHOKE that it was actually sucking gas out of the back side of the carb. It was blowing it all over the lower half of the right wing, and to my surprise it ran even worse in the air. I decided to remove the CHOKE and test it. I was able to use something, even my thumb, to choke the carb and get an initial pop from the engine. When I was finally able to get her running, the settings needed to leaned out considerably at both high end and low but it corrected all of the problems. I was surprised that this has not been noticed by anyone else, but the choke may need to be removed and the holes closed up in order for the engine to run as advertized. I was finally able to run her with a 13x8 MasterAirScrew prop at just over 10,600 RPM. Not unlimited verticle but certainly a strong showing.

I do wish that BME would have gotten back to me and helped. I was getting seriously pissed for a while.
That's my story, hope it will help someone, I believe it is a strong engine for a 60 size plane.

Good Luck Folks.....