These things are governed for 7000 rpm...I had heard that lumberjacks took the governor off....It's an air vane thing like Briggs and Stratton lawn mowers use...It's gone...
I think it's going on a very large Spitfire...
It doesn't seem to shake too bad...I tested it on my Black and Decker Workmate test stand...Had to hold it down, though....
We use TWO of these cylinders on our Herbrandson racing twins...Estimated HP on glow fuel is about 30.....The stock version is 26 hp....
Maybe we should use 088 cylinders on the race engine, we turn the 090 version at 9000+