Beware dodgy spark plugs

[matadora]

I bought a service kit on eBay from a shop with thousands of reviews, 99.7% positive. It came with a counterfeit spark plug–a common NGK CR6HSA (£3-4 retail).

NGK have a guide for identifying fakes, but I though I'd share some pictures here for reference.

Note the original's font weight, the lighter blue, and the corrugations on the insulator:
https://i.postimg.cc/5QFc2gZ6/IMG-20240919-170109.jpg

On the fake plug, note the poor thread quality on the terminal stud, the smudged lettering, and the overall oxidation:
https://i.postimg.cc/1ndhS27k/IMG-20240919-170330.jpg

On the fake plug, note the machining marks above and below the hex, the uneven thread, and the arch of the ground electrode:
https://i.postimg.cc/gXjFfmsy/IMG-20240919-171022.jpg

The original box is less flimsy and shiny; as of last year, NGK Spark Plug Co became Niterra Co:
https://i.postimg.cc/4KJTQzhS/IMG-20240919-163347.jpg

If you’ve recently serviced your bike and it’s running worse than before—perhaps with a rough idle—it’s worth checking the spark plug.
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Pootling along the streets of London on a YBR 125 (2010)

[rpsmith79]

Good spot, how did you get on with eBay seller when you told them about the fakes?
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Current Bike: Honda CG125 ES4 // Honda CB600FS Hornet // Triumph Street Triple R

[A100man]

..but did it work?

PS nice glitter polish.
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[Fizzer Thou]

I do not usually post much anymore but this is one of those times when I felt I need to respond.

I bought some NGK plugs for the Exup1000 from M&P a while ago.They seemed okay until on the way home from a breakfast ride when it went onto two cylinders,numbers three and four.I knew that it was not anything to do with the coils as they are high output Dyna items.
Once I managed to get home I pulled on the plug caps and two of them came away easily.As can be seen in the pictures,the core has come away.I can only put this down to fake plugs as I have never experienced this before.
I can only say that I had never previously bought spark plugs from M&P before,but this will be the last time.I do not buy them on eblag either.

https://i.postimg.cc/GphxGYBS/20200522-153132.jpg
https://i.postimg.cc/CxyPS2mC/20200522-153142.jpg
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Just talk bikes.What else is there?

Always have a 'Plan B'

[WD Forte]

[sickpup]

Fizzer Thou

Very unlikely that M&P have knowingly sold fake plugs.
Have you tried contacting them?

[Fizzer Thou]

[sickpup]