Well, I'm hoping my 12-6 prop isn't too small for this engine. I'm using it to pull my Hangar-9 Tango, and it seems like it has plenty of torque. Most of the time, I'm at 1/2 throttle, usually opening it up when I'm pulling out of a hover or going vertical on takeoff. I haven't had any problem through the last two gallons of fuel, and I only get smoke when I open it up. I tried to set the needle so it'll run rich, almost four-stroking and smoking constantly, but it always blows unburned fuel out the muffler and shuts down when I do that. So, I just set it so it runs and starts with good reliability, smoke or no smoke. I did the same with a 46AX, and it's on its second year and 8th gallon running an 11-6 without issues. Am I doing the right thing? Both engines are warm to the touch after each flight, so I don't think they're running too hot.

NorfolkSouthern