Finally broke down and called tech service. Turns out the Saito 82 is not the same size as the Evo 61Nt. Though inside the manual they suggest the Saito 82 they recommend the Saito 91 on the advert for the plane. I have a Saito 100 and it is the same size as the 91 but stronger. It fit the engine mounts just great. Which propeller and spinner do folks recommend with this engine? Thanks for the help. These forums are great for us new guys. My son and I are in this for real now. We now have 4 planes and one more on the way.