I had forgot I took some pics of my old MVVS 35cc engine. it isn't exactly a lightweight engine either.
It is a little on the heavy side with its All up weight.  I need to put this on something in the future as I remember it as being a pretty nice running engine at the time.  Beleive it or not the plane it was on was involved in a mid-air on the ground collision. Someone else lost control of their plane, it did a huge loop on take off and dived straight  into the pit area right on top of my plane. No damage to the engine of course but the plane didn't do well at all.