NGK LMAR8D-J Spark Plugs

[globalrider]

I just bought a set of these NGK LMAR8D-J spark plugs from a local motorcycle accessories dealer, not Amazon. And having seen a couple of YouTube videos about "fake" NGK spark plugs, I had a close look at the ones I bought.

They appeared to be genuine but when doing a resistance measurement of the center electrode, it was an open circuit. Now I never bothered to ever check this in my well over 50 years of wrenching, but it was one of the tests in the video and those NGK plugs although different from the ones I bought, measured in at 5K ohms (a resistor plug).

 

[Omega Man]

I’ve always found testing plugs and wires difficult and or fairly misleading. The real test for plugs and wires (new) seemed to be once installed.
OM

 

[globalrider]

I’ve always found testing plugs and wires difficult and or fairly misleading. The real test for plugs and wires (new) seemed to be once installed.
OM

In this VIDEO at 5:11, he is getting consistent readings on the real NGK spark plugs. Then look at the fake ones he does right after them.

 

[Omega Man]

Interesting video. The visual “inspection” seems like a good way to do a quick check. I wonder if it’s just the Iridium type of plugs that are counterfeit?
Before “fancy” test equipment, and the ability to understand how to use it, we would test “resistor” plugs by holding a transistor radio tuned to the AM band near the plug/wires and listen to/for changes in interference to the AM radio.
The testing with the VOM does drift back to the discussion on VOM usage and familiarity.
The most key component of the video is the cost difference- to be a signal that something is suspicious.
OM
BTW,
Resistor plugs & caps were originally designed & implemented to combat electrical noise created by cars that interfered with TV & radio reception.

 

[pauls1150]

There's a related video regarding fake Denso plugs at

That one has a couple more things to look at.
Just a bit of sniveling re the NGK vid: He might have gotten more consistent readings from the Real plugs by keeping his fingers off of the test leads...

 

[globalrider]

There's a related video regarding fake Denso plugs at

That one has a couple more things to look at.
Just a bit of sniveling re the NGK vid: He might have gotten more consistent readings from the Real plugs by keeping his fingers off of the test leads...

Yes, I noticed that but strange that he would get consistent readings on the genuine spark plugs and readings all over the map on the fake spark plugs.

 

[globalrider]

Anyway, I stopped in at my local BMW dealer to get some maintenance items and while there, I asked to see a genuine BMW/NGK spark plug. Same open circuit reading. Now I have to see how the center electrode is made.