I agree with all of the above. I would strongly advise ditching the 61. That would be serious overkill. And I think a 20 oz tank is just too big. It will work but you really do not need that big a tank. I would say a 12 to 14 oz would be fine. Especially if you go wiyh a 40. That big of a tank will make it very nose heavy when taking off with all that fuel in there. I am only making suggestions. Mine is NOT the voice of doom. I just feel with the smaller tank and engine you will enjoy it more. Brst of luck with your new plane.

Mark Shuman

BTW mine has a Saito 50 4 stroker on it and I never need more than 3/4 throttle.