Spark Plugging the Classics

Simply the best guide there is on how to read spark plugs to diagnose engine faults, and to select the correct grade of plug for your engine. It explains the differences between modern plugs and those from the classic period, and shows how to select modern plugs for use in older engines. This short booklet simply explains everything most classic owners need to know about spark plugs, the types available, the difference between hot and cold plugs, and the relationship to the ignition system such as coil or magneto. All the likely states of your spark plugs are illustrated, explained and remedies suggested and there is also a table of the common plug equivalents, showing hotter and colder plugs.