Engine ran great. Put two flights on it yesterday. Had one dead stick but I think that's because I had my idle set a little too low. Power seemed the same but the sound was definitely much more mellow. I really like it. I doubt this made my Revolver 70 any faster and I never clocked it before hand. Can't compare to the other guys 70 now either as he destroyed his a couple weeks ago. Doesn't matter. I'm loving this little engine, especially on this plane and have more than gotten my moneys worth out of it.