Wow, I like those changes a lot! A couple of very small details:
The rear counterweight looks a little large now. Maybe it's a shadow line, maybe it's the outline, but I'd like to make it appear to be the same size as the front counterweight. Whether that means re-sizing it or playing with shadows/outlines doesn't necessarily matter, just want the counterweights to look the same size.
The front counterweight may be just a smidge non-symmetrical. The left side of it is perfect and close to reality, the right side is a little off. This was a problem in the design I attached for this contest as well, so it's probably a carry-over from that. The area I'm talking about is just to the right of the middle crankshaft hole. That counterweight radius doesn't seem as smooth as the one to the left of the middle crankshaft hole. It may not be at the same horizontal location either. Anyway, can you just check that general area for symmetry? Again, the left side is what I'd like it to look like.
Thanks again, I'll miss you when this is over Medi ;-)