I've owned three of them. They ran perfect. I sold them to guys that think they are great. They've never given anyone a minutes trouble. A guy came to the field with one that he said wouldn't run no matter what. I removed the Fox idle bar plug and installed a Tower Power plug. Tuned it up and he flew it the rest of the day.

I don't see that they are any different than your experience with the 75's.

A couple of friends have had a GMS 47 between them and that engine has always run fine also.

Enjoy,

Jim