With contact breaker ignitions it is of vital importance for reliable running engines, that the condenser and contact breakers are in top condition. If your engine is poor running, stalling and hard to start it could be a problem related to this parts. A first way of checking is the colour of the ignition spark, if it tends to be more orange than blue, this is the first sight of time for changing condensder and contact breaker.
Ø=14x35mm
µF=0,30