Pretty nice numbers. I only get 7360 rpm with a Top Flight 18X6 Power Point prop. Only mod is a larger bore carb. I'm using a Walbro WT-324 which is 11.1mm. I did open up the inside of the stock muffler some and put a 1/2" outlet on it. I've never had the cylinder off it so I don't know how the ports are in it. I would say it is one of the newer style low emission type engines so I may not get much more from it. What is the best gap for the spark plug when using EI? I've got mine about .020" gap. Any thoughts how to get a little more power out of this thing. I may need to get a new ring(s) from Frank Bowman. I've heard this will help as it has stock ring(s). I don't know if it has one or two rings.