Hello!
The MVVS runs good. It has the new MVVS carb with 10mm intake hole. It is a ABC engine with a steel muffler( but buy the quiet silencer instead as this muffler has larger volume)The crankaseis the same as for the 10cc MVVS engine.
You can see a picture of the engine at my homepage
http://hem.passagen.se/airracing
Regards!
Jan K
Sweden