I've got the engine and it's mounted on a 13#2oz Katana waiting for the weather to break for it's maiden......and was trying to get some input as to the performance on a plane weighing it at this weight..I love the little 40cc...like everyone states,,easy starting and very reliable in transition...and it runs forever it seems on 12oz of fuel...broke it in with a 20 x 6 which is too small for the engine (7700rpms) and now have a Xoar 20 x 8 which brings the rpms down where they should be..around 7150..any info you could send my way would be appreciated...