the Guzzi twin is a very different configuration than the HD or S&S twins. The second group of engines have a surge of power in each cycle. Probably the best way to describe it was when I was on a paddle wheel on Loch Loman which had a somewhat similar two cylinder lay out. You could feel the boat surge as it went through each power cycle... sort of a SPLASH SPLASH splash splash splash splash… The compensator is meant to ease that surge during each power cycle.
If you were to slow down an HD engine you would actual hear THUMP THUMP pause pause pause pause THUMP THUMP pause pause pause pause
