I recommend getting a Novarossi .12 and gear it up a tooth on the clutch.
Like earlier post said. A really nice .12 would be really nice, and you can get more power from a bigger number, but the racing engines are in a .12 size and scream... Look on A main. they still make a Nova .12.... you could make the clutch bell larger or put a smaller spur gear on it....both changer will give you rpms/.......
