I was planning to use the 3010 but now that you tell me not to use them I am going to have to re think what way to go. What would you recomend I use in this plane? For the servo horn also im not sure what size I could go with if you have any input on that. I fired the engine up again and this time I leaned the high end a bit. I ran the rpm up and it hit 7020 no problem cause its still a little rich on the high end. It will idle at 1700 and its happy there I could go lower but I dont think I need to. I have a wt-540 carb for this engine I will put on for more hp when I put it in the plane.