You also will hear from other people that this particular engine consume a lot more fuel than others in the same range of displacement, the real fact as others have pointed is the lack of a proper low idle tuning. I also have this engine and has been said it takes a while to breake in, when finally is broken in then you can play with the low neddle valve. I like the Gray Beard method which I will try the next time that I will fly my funtana .40
Great engine