Champion N7Y(C) spark plug evolution

[jimbo]

Here are some photos of different era N-7Y and N7YC Champion spark plugs. I only guessed the dates. Kind of useless rivet counter information.

 

[jimbo]

note, the old stock plugs have "made in USA" the recently purchased ones do not

 

[ashman]

note, the old stock plugs have "made in USA" the recently purchased ones do not

So that means they are a lot better now without the made in the US and back in the early years running Champion plugs in Commandos when they had a bad batch of plugs (made in the US???)put a lot of people off Champion plugs for awhile but my Norton runs better with Champions as i found out when i suffered the bad batch, my Norton didn't like NGKs or any other plug with the same heat range.
Not everything that is made in the USA is best.

Ash