I got you there, Ray. I don't want to run lean. I did notice that I can keep it running if I leave the ignitor attached, that tells me that the thing is rich. What the guy from Horizon was saying is that it may need a hotter plug to burn off all the fuel when the engine is mounted horizontally, not an issue when the engine is mounted vertically. I agree that it is some issue with fuel draw, but the problem goes away if I mount the engine vertically. I took the motor out and put it in another plane, and within minutes the thing was adjusted and flying. This was why I took a second tank and tried it, and eventually took the tank out, and varied the height of the tank + - 2 inches. It didn't have an effect on how the motor ran horizontally. Mounted in the old aircraft, the carb is about 1/2" higher than the top of the tank, but the carb is also horizontal, not vertical. This is the only thing that varies. Same fuel, Omega 10%, sometimes Coolpower. I forgot to mention, I put a complete o-ring and gasket set in the first motor, thinking that I may have a hard to detect leak somewhere.


Fly64s, I will post a picture of how I got the switch mounted, it's really simple, I drilled a tiny hole in the switch stem to accept a small length of pushrod. I picked up a drill from a welding supply store that has very tiny bits for clearing the orifices in welding equip. It has bits that go up to around 1.5mm or so. It was about $8. I didn't want a knob to look like a switch knob, so I took a short length of brass tube and glued it to the stem after I bent it at a 90. Makes it look somewhat like a pitot tube...