Ignition points are basically a coin operated switch. Exceptionally high mechanical and electrical demands are placed on the contact breaker. High RPM, heat and engine contaminates can cause rapid wear of ignition points. The rubbing block wears due to friction and the contact points pit and deteriorate as up to 18,000 switching operations per minute are performed. Dwell and spark timing change as the ignition points wear. Heat and continued use can cause the condenser (ignition capacitor) to weaken as the inner foil winding looses insulating properties.

Change your ignition points and condenser every 3,000 miles and always keep an extra set of breaker points and condenser in the vehicle some place. It could save you a long walk home.