Here is a neat pic of a dual carb 40 knucklehead that my friends Matt and Dale built. I got to ride this bike, and it was the first motorcycle that I have had out on the road since my crash. My left arm still hurts three days later, I hope that it will be healed up and ready by the time riding season starts.
This bike had a mag dralic brake on it. It does not work very well. I have had one of these set ups for ten years and have not put it on a bike.