Spark plugs

[duTch]

 For what it's worth, by chance yesterday I pulled the plugs from my Hilux, to find they are 'Y' series plugs - I knew I'd seen 'em somewhere before. ..these are BP5EY (replacing N11EYC)...not BSA though, but funny all my petrol engines run same-ish plugs

[Worty]

B6HS in my ironhead - no probs.  Bought a pile off fleabay dead cheap and so far not missed a beat.  Change them when I feel like it - last ones did 3k and showed no problems.  Maybe I've been lucky??

[RDfella]

I notice resistor plug caps have been mentioned. They should not be used with a magneto.

[duTch]

 

I notice resistor plug caps have been mentioned. They should not be used with a magneto.

 That was probably me referring to the episode with my Gutzzly(Bosch W5DC), which by 'coincidence' went out in solidarity with the A10....."one out-all out"  ....weeell only one Bosch- the one not stamped 'Germany' ....I don't have resistor caps on the A10(old-school Champions);
 

...........RHS no change *except* when the cap was just close enough but not solid, it started to fire as per normal  (NGK resistor caps)....not BSA, but curious why so that's where the BP6EY plugs went, .............

 

Yes, that is correct.
The easy qay to keep them clean all you have to do is starve the engine off.
As the carb runs out of fuel it will burn very lean and clean all of the crud off the plugs.

 I don't have a reserve on the A10, but Gutzzly does, and I run it until I get to reserve, and then fuel up, so ^^that happens at least every thankful (tankful for reserve )

[worntorn]

I bought some cheap eBay NGKs and they are fakes. I suspect most NGK plugs for sale on eBay are fake.
Ignorance is bliss tho. I did not know about the fake NGK problem until recently so I ran the plugs and they worked fine for quite awhile.
Once I learned they were fakes I got rid of them. Not worth chancing a plug losing its innards down the bore or just dying.
On checking the new remaining ebay fakes ( l bought a BIG box!) I found infinite resistance terminal end to electrode on most.
On the authentic new NGKs I found continuity
from  terminal end to electrode.

Glen

[JulianS]

Post 1953 BSAs would have been fitted with resistor plug caps as original equipment due to UK legislation. I have never seen anything in Lucas service bulletins advising against resistor caps.

Over the past many years my high comp alloy head A10 has sometimes used resistor caps and sometimes non resistor and i have not had any problems either way.

Currently using new old stock Champion N4G gold paladium plugs, bike seems happier with them than with the current production N4C.

[RDfella]

As JulianS says, resistor caps were fitted to comply with legislation. The fact they reduce the spark, can make starting significantly more difficult and can damage the magneto had to be overlooked.
http://www.brightsparkmagnetos.com/faqs/FAQs%20about%20magnetos%20generally/Are%20suppressors%20and%20resistor%20sparking%20plugs%20OK%20to%20use%20with%20magnetos.htm

[Worty]

Just checked my NGK B6HS plugs and they're all genuine.  £8 for 12 on fleabay, not bad!!

[Greybeard]

Just checked my NGK B6HS plugs and they're all genuine.  £8 for 12 on fleabay, not bad!!

How can you tell?

[Worty]

Hey GB, check out some of the YouTube vids.  Key things are having a four digit code on the hex, packaging correct with appropriate trade marks, colour of packaging, making sure the crush washer doesn't fall off past the threads, etc, etc.

Of course, anything can be counterfeited, but the plugs stand up to testing for continuity, etc.  Ultimately, do the bloody things work.  The ones I bought have stood up to a lot of stick over many 000s of miles, so that's enough for me.

I stand to be shot down in flames but, the proof of the pudding......................!!!!

I have not been to the pub but have emptied the fridge of beer (hic)

[duTch]

 With regard to;
 

... Reply #19 on: October 15, 2018, 12:49:42 »....

 So my problem was not actually Spark plugs, but turns out the slip-ring had blown a hole in the shaft side so was doing progressively intermittent arcing until it just failed completely...I think I need to elaborate further elsewhere