Maybe I’ve been lucky, but over the years I’ve fitted dozens of Meco modules to a variety of engines including many old Villiers, and never experienced a problem – other than on one. That exception was a two-stroke Allen Scythe with the centrifugal governor system operating on the contact breaker points. Fitting the module effectively by- passes the governor, resulting in spectacular rpm! We worked out a way around the problem, but that’s another story.