Spark plug dating guide
Chad Windham, President of the Spark Plug Collectors of America, identified the Coso artifact as a 1920s-era Champion spark plug, which was widely used in the Ford Model T and Model A engines.Other spark plug collectors concurred with his assessment.It can therefore be tricky to know what type to install.
But then I realised that the Bullet plugs only had 1/2″ of thread whereas my Matchless requires a longer 3/4″ reach in order to protrude correctly into the combustion chamber.
Also those that were available often seemed to have strange codes that didn’t fit with any of the numbering systems I was used to from back in the UK.
If you needed a plug for your Honda motorbike, you just go to the Honda dealer and ask for a plug for your model and they will give you the appropriate one.
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