Any one else have an Evolution 61 engine? I thought it would be good but there is something wrong. I can't get more than a few minutes flight out of it before it starts to falter. It seems to be leaning out. I kept adjusting it rich until I get a full flight out of it without it stumbling. Problem is at this setting I am only getting around 10K on an APC 12-6 prop when its upposed to be 12k. OF course this means that I don't have much power. I tried a Tower Hobbies 75 on the same plane to see if there is a problem with the fuel tank setup but it adjusts easy with tons of power! Any ideas appreciated!!!!