Well, I got the engine back from Bowman. It was a 2 ring engine so my total cost shipping both directions and ring cost was about $30.00.

The specs for this engine says it has a range of 2000 to 7400 rpm with a 17x6 prop. I fired it up with a 16x8 Xoar and after a lot of tweaking was only able to get 6600 rpm out of it. Maybe that will improve as the rings wear in a bit. I really didn't see any improvement with the Bowman rings but it was worth a shot. I haven't tried a 16x6 prop yet and will probably do so. I will fly the plane with the 16x8 and see how it performs and then try the 16x6 and live with whichever does better.

The engine just purrs at about the 4500 rpm range as if it is really happy there. I have the DLE20 carb on it as the Walbro WA197A was not doing well at all.

Anyway, I am just updating this thread with the latest information I have.

Mike