Earlier single points systems:
Early Rover Single points system, apart from being very inefficient in the first instance, the single points and most of the electronic systems are all now suffering from failing mechanical and vacuum advance systems and excessive component and shaft wear. The effect of this will, of course, be to produce poor spark intensity and erratic spark timing (not the best recipe for an efficient engine).
Many customers think they have rectified, or can rectify these problems by fitting an after-market 'add on' electronic ignition (such as Luminition), but as this still employs the original distributor with its ageing mechanical components with their age-related wear and tear problems, and cost almost as much as a complete brand new Mallory replacement distributor, this is a false economy.
Later Original equipment electronic ignition systems