According to Phil Bleazey the likely culprit in my case is the variable amount of effort S&S put into balancing the crank shafts, meaning that I have a relativly "unbalanced" crank.
Could well be, Phil is a clever guy and highly experienced regarding the 3-wheelers.
The engine mounts do settle down a bit after a while.
Phil still on the scene? Was led to believe he had sold up all his kit and fully retired?
