Author Topic: NGK D8EA Spark Plugs (Read 2916 times)

BenelliSEI · « **on:** March 30, 2019, 12:37:33 pm »

Recently had a bad experience with a new box of NGK spark plugs. Took me a while to catch on too! 4 new plugs, bike ran fine (cb750K1). Next ride, slow to start and a cold pipe. Checked the plug and it sparked fine, when laid on the cam cover and cranked. Suddenly, bike ran OK. Next time, plug would not even fire on the cam cover. Less than 200 miles, completely duff plug. Replaced it, problem solved.

Same batch of plugs (box of 10), in my K4, one completely refused to fire. Nothing. Replaced, problem solved. That’s a 20% failure rate....... anyone else?

robvangulik · « **Reply #1 on:** March 30, 2019, 12:48:07 pm »

Fake NGK's?
Search for it on the web....

bryanj · « **Reply #2 on:** March 30, 2019, 12:48:48 pm »

There has been discussion on the UK site about counterfeight NGK plugs about, do you think this is what you have? Were they bought from a reputable source?

BenelliSEI · « **Reply #3 on:** March 30, 2019, 04:21:52 pm »

Clubplug.ca is the NGK Canadian distributor....... not likely to be fakes.....

robvangulik · « **Reply #4 on:** March 30, 2019, 04:41:04 pm »

In 40+ years i've never had a new NGK plug fail!
So unlikely but not impossible.....

jgger · « **Reply #5 on:** March 30, 2019, 07:44:10 pm »

Dropped box maybe? The box comes 2 rows hi, could have been dropped somewhere along the line.

I had that in a box of motorcraft plugs for my pick up truck. They are only 1 row high in the box, so it was only 1 bod plug.

PeWe · « **Reply #6 on:** March 30, 2019, 11:38:36 pm »

The new plugs where failed look OK after some riding?
If your floats might fload fuel...

BenelliSEI · « **Reply #7 on:** March 31, 2019, 09:37:34 am »

Never happened before..... total failure. Hope it was jus bad luck.....

MoMo · « **Reply #8 on:** March 31, 2019, 02:47:07 pm »

never experienced a bad NGK plug in over 40 years. Larry

BenelliSEI · « **Reply #9 on:** March 31, 2019, 04:41:12 pm »

Either have I! Just recently.....

Prospect · « **Reply #10 on:** April 01, 2019, 05:51:08 am »

I've had some failures from new ones over the years. They weren't fake.

flybox1 · « **Reply #11 on:** April 01, 2019, 06:36:26 am »

how did they fail? can you post a picture of the plug and insulator tip?

BenelliSEI · « **Reply #12 on:** April 01, 2019, 03:47:53 pm »

Sorry, no photos, tossed them in frustration. They actually looked fine. The first one I spotted fired a few times when grounded on the cam cover and then simply stopped. All 4 plugs were out. At first I suspected the wire or end cap. No issues there. Plugged in a new plug, big fat spark! RE-Checked the original several times, nothing........ weird! NGKs are still my “go to” plug, but when I have a problem, they get tested. Assume nothing.

PeWe · « **Reply #13 on:** April 01, 2019, 09:20:13 pm »

Photos might have id them as fake plugs.....

BenelliSEI · « **Reply #14 on:** April 02, 2019, 05:18:20 am »

As I said earlier, they came from a major Canadian NGK outlet. Not fakes.

Can550 · « **Reply #15 on:** April 02, 2019, 05:20:13 am »

On my CB450, NGK B8ES right side failed while ideling and testing/ tuning idle. Can’t say miles but in less than 20 minutes and now no spark. Checked on different bikes

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PeWe · « **Reply #16 on:** April 02, 2019, 10:58:42 am »

I hope there is no bad batch of NGK plugs I have around 3 boxes of 10 in stock for MY use!

Strange, they quit without fouling like internal disruption.

Tracksnblades1 · « **Reply #17 on:** April 03, 2019, 04:25:51 pm »

It not good to hear you had new NGK plug failure. However I had an interesting first with NGK plug. The porcelain tip split off and slid down the fine wire and stopped on the ground electrode snuffing the spark and go instantly. The plug was NGK BR10EG in Honda CR85R running a touch lean on a cold day. Not the same as old 750's but I've never seen a NGK failure like this. Old Champion N3g yes, but never a NGK.

MarkVMod0 · « **Reply #18 on:** April 05, 2019, 06:53:58 pm »

It happens, I rebuilt an 80 Honda CBX engine, I take special care in carb cleaning and settings. The bike fired up and idled fine. Put about 250 break in miles on it and was having some issues that mimic some familiar carb issues, Crap! I pulled and went through those carbs three times before I realized it wasn't the carbs. My old fuzzy synapse fired correctly for a microsecond and I remembered having the very issue many years ago and it was a spark plug. The trouble was identifying which plug it was as the damn thing was intermittent. I replaced them all and that cured the problem. I bought the plugs from a reputable dealer but never gave a thought to the possibility of counterfeit plugs.

Sometimes the simplest solution is the correct step to take.

BenelliSEI · « **Reply #19 on:** April 08, 2019, 09:27:40 am »

MarV...... that was my scenario! Now the first thing I do is new plugs! Wasted days diagnosing the first time!

PeWe · « **Reply #20 on:** April 10, 2019, 04:50:16 pm »

Tried Denso plugs when NGK failed?

BenelliSEI · « **Reply #21 on:** April 10, 2019, 07:47:08 pm »

I’ll give them a try!

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Author Topic: NGK D8EA Spark Plugs (Read 2916 times)