Thank you all for the responses
I'll give some more thought to removing them.
One of my thoughts is that it gets up to 115 degrees F here in the summer and 108 is pretty common. An air cooled engine like this needs all of the cooling it can get when it's that hot.
Yes, it's a "dry heat" but the engine doesn't know that.
Those rubber dampers cover up a fair amount of the fins surface area and they also block off the flow of air past them. That can't be good when it is really hot outside.
If I were an Enfield design engineer I would be more concerned with overheating than with sound emissions.