Engine misfiring

[Tony Griffiths]

David's beautiful Chummy, which I now have, came with NGK plugs one of which failed (at the time my grandson was with me and I taught him how to recognise which one - "You'll get a severe burn from three of them, but not from one. Now, how do we proceed?").
I put in a new NGK and, guess what, that too failed a few days ago - so I chucked them all away and installed a set of new Champions from the Seven Workshop. A friend, who was visiting, remarked that he's heard that NGKs have, for years, had a reputation of sudden failure - while another said that the plugs in his fleet of RNs had not been touched for years - these probably being the renowned but long-unavailable Lodge C3 type?

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There are many articles about fake Ngk plugs on the internet,
https://www.diycarserviceparts.co.uk/blo...ark-plugs/

One of the first clues is the colour of the box.

Andy

This goes into greater detail with a side-by-side comparison: https://www.youtube.com/watch?v=7fyD1BXnhtY
...and from the makers: https://www.ngk-sparkplugs.jp/english/te...index.html
Bought on Amazon: https://www.youtube.com/watch?v=Lr9J3eQk-kE
...all Chinese rubbish.
"Project Farm" has lots of data on fakes: e.g. https://www.youtube.com/watch?v=4pXM5bHSk2Y