Very sorry to hear that your Mintor 22 / Revolver combo has not worked out great for you as in my flying club we have a member with that exact model / engine combination and it's a very nice flying model with absolutely no bad habits. Considering that the Mintor 22cc is by no means a heavy engine maybe the additional weight of the header pipe and cannister style muffler might have just pushed it over the edge. Just curious, what was the all up weight of the model with the gas engine ??

My M22 engine is a silky smooth runner and turning a Xoar 17x6 wood prop hauls a 9.3 lb scratch built 69" span Extra 300 profile around quite well.