I remember when we were youngsters in the late 60's and flew control line models most of us had Fox 35's for bigger motors and I went and bought an Enya 35. That was the most miserable motor I have ever broken in. We had a gear driven electric starter and the Enya broke it. We started calling them "Hemorrhoid motors". Terrible things to break in but I still have a couple 35's and a 45 and they are still running fine 40+ years later. The Enya air bleed carb definitely required a magicians touch to get right even on their helicopter carbs. They were very different from the OS air bleed carbs for sure.