I would also love to hear anything about this particular engine including setup, prop, fuel, rpm etc.

I don't have experience with the engine yet.
I just bought a used one to rebuild and replace my YS91AC.


So far here is what I know.

The original owner of the engine (I am the 3rd) told me that the engine is very good. Macs site has a tuning tip on TT120 rear exhaust and pipe setup.

He also told me that the engine is slightly less powered than OS 140RX. I am going to use a 4-stroke carbon muffler with this engine since it is sure enough for my application probably with this setup.

http://www.macspro.com

For the header,
In US, Macs is the only place that sells the header pipe, but there is Karl Mueller in Canada who can build a custom header.

He is a very nice guy, so if I need another header of different height, I am going to custom order one from Karl.