RogerH Posted August 2, 2018 Report Share Posted August 2, 2018 Hi Folks, in early June my 4A was having fun - running slow in 2nd and then putting the power down. It would cough and splutter but then pick up and run well at higher revs. I changed the NKG BP6HS for new ones and normal life was restored. Through this week I was having the same coughing fits, probably done about 3000 miles plus, so today I changed the plugs for new ones and all is working well again. Is there a problem with these plugs - 2 months / 3000 miles isn't much life for a plug. They were Ebay plugs Todays new ones are from Moss. Are there better plugs? Roger Quote Link to post Share on other sites
RobH Posted August 2, 2018 Report Share Posted August 2, 2018 (edited) Fakes? see youtube.com/watch?v=cD1rgG8-1e8 Edited August 2, 2018 by RobH Quote Link to post Share on other sites
barkerwilliams Posted August 2, 2018 Report Share Posted August 2, 2018 (edited) Are you sure it is the plugs, or could another part of the ignition be a little marginal and showing up first as the plugs naturally wear / degrade with use? Do you have one of the very high voltage coils that might not be doing the plugs any favours and leading to the early death of the plugs? https://www.scc-racing.com/racing-blog/warning-non-genuine-spark-plugs Alan Edited August 2, 2018 by barkerwilliams Quote Link to post Share on other sites
RogerH Posted August 2, 2018 Author Report Share Posted August 2, 2018 Hi Rob, I shall have to dig my boxes out and check. Roger Quote Link to post Share on other sites
RogerH Posted August 2, 2018 Author Report Share Posted August 2, 2018 Hi Alan, I used a very complicated substitution of distributors (standard 25D and NEW ebay) and the fault persisted. I used a new dizzy cap - same fault. Old/Ancient leads everything was bad New leads - same as the originals + new plugs and the fault was gone. OK - tomorrow I will fit the old leads + the new plugs and see what happens. However in early June I simply swapped the plugs for new and all was good for two months. Roger Quote Link to post Share on other sites
ctc77965o Posted August 2, 2018 Report Share Posted August 2, 2018 If they are really NKG then 100% chinese fake.... NGK fakes more difficult to spot...but generally I think they only fake the high-runner BP6ES...not the HS... Quote Link to post Share on other sites
RogerH Posted August 2, 2018 Author Report Share Posted August 2, 2018 OOOOOPs!!!! it should be NGK. Roger Quote Link to post Share on other sites
graeme Posted August 2, 2018 Report Share Posted August 2, 2018 Hi Roger, Could it be a faulty plug cap/lead, disturbed during the plug change, working OK for a while? Cheers Graeme Quote Link to post Share on other sites
RogerH Posted August 3, 2018 Author Report Share Posted August 3, 2018 Hi Graeme, it feels more consistent with the plug change than simple disturbance. Roger Quote Link to post Share on other sites
Nick Jones Posted August 3, 2018 Report Share Posted August 3, 2018 Bosch W7BC? Or better yet W7BTC with triple electrode? Though either may be hard to find in non-resistive form (WR7BC + resistive version) Or equivalent Denso. I've given up on NGK. Bosch triples are lasting 30k...... Nick Quote Link to post Share on other sites
tim hunt Posted August 3, 2018 Report Share Posted August 3, 2018 I strongly suspect fake plugs Roger. If you google you can find tips to differentiate these from the pukka jobs. I adopted NGK when recommended by SAH so you can tell how long ago that was. I have used nothing else since and never had a faulty plug, either BP6HS or BP7HS work for me so maybe I need a BP6.5HS. Tim Quote Link to post Share on other sites
Rem18 Posted August 3, 2018 Report Share Posted August 3, 2018 Yes its probably fake plugs. I am working on an anti-counterfeit project for another auto parts supplier in Asia, its rife... Quote Link to post Share on other sites
roy53 Posted August 3, 2018 Report Share Posted August 3, 2018 condensor. Quote Link to post Share on other sites
Lebro Posted August 3, 2018 Report Share Posted August 3, 2018 I bought a set of NGK plugs from Ebay: https://www.ebay.co.uk/itm/s2-4x-NGK-SPARK-PLUGS-Part-Number-BP5HS-Stock-4111-New-Genuine-NGK-SPARKPLUGS/173251147134?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 Very cheap, have just checked the plugs themselves, & also the boxes, & everything checks out as genuine (according to the video in post No. 2 above) Working OK so far. Bob. Quote Link to post Share on other sites
peejay4A Posted August 3, 2018 Report Share Posted August 3, 2018 I’ve changed to Denso Iridium. Quite expensive but so far so good. Quote Link to post Share on other sites
monty Posted August 3, 2018 Report Share Posted August 3, 2018 I bought a set of NGK plugs from Ebay: https://www.ebay.co.uk/itm/s2-4x-NGK-SPARK-PLUGS-Part-Number-BP5HS-Stock-4111-New-Genuine-NGK-SPARKPLUGS/173251147134?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 Very cheap, have just checked the plugs themselves, & also the boxes, & everything checks out as genuine (according to the video in post No. 2 above) Working OK so far. Bob. I get mine usually from Euro Car Parts via EBay & they all seem to check out OK, having checked on YouTube for the fakes. Quote Link to post Share on other sites
RogerH Posted August 3, 2018 Author Report Share Posted August 3, 2018 Hi Folks all my small boxes agree with the original product as per the Utube video. I'm now concerned that the UTube video is a fake Roger Quote Link to post Share on other sites
RobH Posted August 3, 2018 Report Share Posted August 3, 2018 .. or maybe the counterfeiters have see the video too and upped their game? Quote Link to post Share on other sites
RogerH Posted August 3, 2018 Author Report Share Posted August 3, 2018 Quote Link to post Share on other sites
ChrisR-4A Posted August 3, 2018 Report Share Posted August 3, 2018 Hi Roger, back in the day when I was running a Kawasaki 1200 drag bike I had sponsorship from NGK in the form of a box of about 200 plugs, at the time my bike was running twin 40 Webber's and although it ran correct from 50000-11000 rpm it had a tendency to foul plugs whist warming up. I found that the resistance of the new plugs varied by quite a bit and the ones which worked the best were those with the lowest resistance. I would be surprised if all 4 plugs were duff so what I would suggest us change plug number 1 check resistance of old and new. If it runs no better put old plug back and change plug number 2 and so on. It only takes one dodgy plug to make it run like a pig. I've been using NGK in my 4A purchased from TR shop each year at the International and never had any problems with them. Two good plugs removed at last service show a reading on my multimeter of 0.48 with the ohms set at 20M. I would think that if the reading was 0.3-0.5 then ok but much higher and could be a problem. Quote Link to post Share on other sites
keith1948 Posted August 3, 2018 Report Share Posted August 3, 2018 Hello again Roger Very interesting information regarding fake NGK spark plugs above. I use NGK BP7HS in the 4A. It used to run on (diesel) after switching off the ignition. The cooler running BP7HS rather than BP6HS solved the problem. The engine in mine is standard but the BP7HS plugs seem to work better with supermarket fuel. Also I wasn't the only one a couple of years ago to fill up at the Morrisons in Brecon at the Welsh weekend and have the car overheating, coughing and spluttering on the way home. Fresh petrol cured that one. I have a set of Motorcraft AE22C that are supposed to be equivalent to BP7HS or Champion L82YC or L81YC but haven't fitted those as yet. Keith Quote Link to post Share on other sites
Paul J Posted August 3, 2018 Report Share Posted August 3, 2018 Roger I have always used this company for spark plugs and never had any problems either with NGK or NKG www.gsparkplug.com/catalogsearch/result/?q=NA12 Paul Quote Link to post Share on other sites
RogerH Posted August 3, 2018 Author Report Share Posted August 3, 2018 Thanks Paul. Roger Quote Link to post Share on other sites
stuart Posted August 6, 2018 Report Share Posted August 6, 2018 There are an awful lot of fake NGK`s around mostly Ebay purchases but FWIW if you get a new NGK (even a real one) wet by flooding or running rich it will fail, they dont like getting wet. Once they have been run for a while then they will stand wetting no problem, this has been a known problem for years. Try Nippon Denso as they are a good plug. Stuart. Quote Link to post Share on other sites
iain Posted August 6, 2018 Report Share Posted August 6, 2018 Thanks for the tip Stuart, what is the identifying code for the Nppon plug? Iain Quote Link to post Share on other sites
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