I have a new MVVS 1.60 gas engine. Ran real well on the test stand, broke it in carefully and was pleased with its performance. In particular I did not notice the vibration that seems to be a common problem with the gas engines. But when I got it on the plane (Clipped Wing Taylorcraft) it has started to run unevenly anywhere above half throttle. The engine has actually stopped a couple of times in flight which is more than a little uncomfortable. The idle and midrange seem fine and the high throttle settings ran fine on the test stand. So I worked with the low and high speed carb adjustment and checked the fuel lines and tried the engine timing in every possible setting and the same problem persists.

Anyone have any idea what to try next. I have tried several different fuel and oil variations with no help. The one thing that yet occurs to me is that I have been starting it with my regular electric starter instead of starting it by hand flipping. Think I heard somewhere that the electronic ignitions do not like to be spun by an electric starter.

Thanks,

Devdog