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Spark plugs

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Hi what spark plugs are best mine has  NGK  BPR8ES fitted . I am going to fit Pazon electronic ignition this weekend  what would be the best plug to use . My old 71 had champion N7Y  fitted . Thanks   John 

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The plug is matched to the engine, the ignition system should not be a big issue. BPR8ES  the R indicates there is a resistor in the plug. Fine to reduce interference with the neighbours TV but not recommended especially if you have resistive caps. Champion or NGK is your choice. But the right one for the engine.

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Thankyou I had an idea that the plugs were wrong  could they cause a misfire when hot .so are champion N7Y  ok for the  74 850 .

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I've been using Champion N7Ys (Now N7YC) in my 850 for about forty years. I change them occasionally if the plating is looking tatty.

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John......please be very careful where you purchase your plugs from.  Around 4 years ago, one of the TV 'consumer' programmes highlighted a 'fake' product scam that was doing the rounds at the time. The item in question being dodgy spark plugs bought on-line or at auto-jumbles.  Top of the consumer crap being most bikers two favourite choices of plug.  These specials being printed with temperature codes a million miles from the actuality. Experts were able to differentiate the real plugs from the fakes by checking out the plug box labelling, text on the plug itself and the shape of the electrodes. Most of the rest of us would probably struggle.

Purchase your replacement parts at a well-known spares outlet and don't be tempted to put price before quality.  

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I use Denso plugs from RGM, I’ve had problems with Champions previously.

Best regards, Al.

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If the engine is set up for 'racing' ie high-revs, hot working engine, modestly well tuned and used hard then a 'town-soft plug' could cause a miss fire and eventually cause overheating and damaged engine. The obverse of this is a 'racing' hot plug used in town driving, pottering about it will foul up and also miss-fire. But the later will be a nuisance while the former could cause damage.

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There are 2 pazon EI families, an analogue one and a digital one. Analogue do not need resistor plugs or resistor caps but will cope with one resistor, digital need either resistor plugs or resistor caps not both. Same rules for the Boyer etc, Trispark are all digital, Wassell are all analogue.

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On the NGK website is some info about the fake plugs which is quite common. Another thing I've read is that the ceramics in the insulator nowadays is different to work better with modern engines. Been told that NGK plugs made in France are more prone to oiling than those made in Japan.

All from internet, so it must be true!?!

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... is that the ceramic on the nose of the plug is not glazed as it used to be so that carbon is almost impossible to remove. But again internet gossip so may or may not be true.

Thank you for the advice I have bought some but went for a spares shop at a proper price . Not the cheapest . Cheers 

Thankyou  I just potter about  lol . 

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I would think the BPR8ES plugs are too cold and may cause misfiring.

BPR7ES or my choice BPR6ES are in the correct range.

Dave

 


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