Spark plugs

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Single coil setups work best with a plug that fires with either polarity.

Dual coil setups can make use of a plug with an iridium center electrode and plain ground electrode..
 
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@Fast Eddie what Jim said!!!

But for simpletons like me, this is how I see it:

With a dual output single coil, one spark fires from ground electrode to centre electrode, and the other spark fires the other way from centre electrode to ground electrode.

So for these coils, the precious metal tip on only one surface will only be beneficial on one side.

The VW22 has an iridium centre electrode and platinum ground electrode.

The IW22 has an iridium centre electrode and nickel plated ground electrode (same as plug housing) so is ideal if you are running two coils.
 
Hi a simple request Ngk, Champion or Bosch, what are your thoughts.
Was pretty sure you would get a full spectrum of replies on the question or spark plugs. Surprised no one suggested Delco as that has had followers in the past here. Myself I’ve used NGK and Champion with good results. Currently NGK in my ‘72 using TriSpark classic ignition, Emgo 6v coils, solid copper wires and NGK resistor plug caps.
 
The kickback i have been fighting is just like the timing is to far advanced. This is the first ign. System i have had this issue with. The rita’s pazon sure fire and trispark never gave this issue.

And........? Why aren't you using one of the 3 mentioned which never give you a kick back?
 
And........? Why aren't you using one of the 3 mentioned which never give you a kick back?
The rita is an old design that is power hungry and does not play well with dual tower coils and is no longer supported. The pazon sure fire is an analog ign and as such does not have idle stabilization. And lastly if you have followed my posts with 3 trispark failures and the 3rd not even lasting as long as a rear tire along 3 stators costing me $150.00 each on top if the original cost it is why i am where i am at now.
 
@Fast Eddie what Jim said!!!

But for simpletons like me, this is how I see it:

With a dual output single coil, one spark fires from ground electrode to centre electrode, and the other spark fires the other way from centre electrode to ground electrode.

So for these coils, the precious metal tip on only one surface will only be beneficial on one side.

The VW22 has an iridium centre electrode and platinum ground electrode.

The IW22 has an iridium centre electrode and nickel plated ground electrode (same as plug housing) so is ideal if you are running two coils.

So you're suggesting the VW22 for dual tower coils?
 
BPR7EIX NGK iridium have worked well for the past several years on my 750 with a RITA ignition and non-resistor wires and caps...If I lived in a warmer climate I'd likely go a grade colder with BPR8EIX.
 
Where the hell have I been? I never knew, So are the NGK plugs dual polarity?

NGK "iridiums" are not, but NGK does make dual polarity platinum plugs. [generally referred to as double platinum] If you look at the side electrode on a dual polarity platinum NGK you will see a small disk of platinum on the side electrode.

That little disk keeps the electrode from eroding when the side electrode happens to be negative. -ie when the center electrode is connected to the positive post of a dual tower coil.

Spark plugs
 
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NGK now makes Ruthenium spark plugs if you want the best available dual polarity plug.

But since the spark plugs in a Norton are normally changed out within 10,000 miles the extreme life plug options are usually just a waist of money.

[but I do run the Denso iridium/platinum combos in my bike]
 
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So you're suggesting the VW22 for dual tower coils?

Don't get hung up on this unless your doing high mileages... on low mileage machines the erosion is minimal
Ask any owner of a jap multi if he can gauge the erosion difference between the centre plugs & the outer ones
 
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Where the hell have I been? I never knew, So are the NGK plugs dual polarity?


Me to!, didn't know anything about this 'duel polarity' regarding plugs, I was aware of heat range, thread type & reach within the combustion chamber but 'polarity' never came up on my radar!! Must pay more attention in class:D
 
I use Champions N7yc in mine, I have tried NGK's a few different times but they always fail in a couple days. Champions will last a couple years and then I replace them, keeping the old ones for spares because they are still good.
I think a lot has to do with your ignition system.....I'm using points.
 
I use Champions N7yc in mine, I have tried NGK's a few different times but they always fail in a couple days. Champions will last a couple years and then I replace them, keeping the old ones for spares because they are still good.
I think a lot has to do with your ignition system.....I'm using points.

I have the same experience with Champion and points ignition with my first Commando. The electronic ignitions I’ve used since 1981 haven’t really been affected. NGK and Champion have been more available and accepted with the local Norton guys so had no reason to try other brands.
 
Th
NGK now makes Ruthenium spark plugs if you want the best available dual polarity plug.

But since the spark plugs in a Norton are normally changed out within 10,000 miles the extreme life plug options are usually just a waist of money.

[but I do run the Denso iridium/platinum combos in my bike]

Thanks Jim, I've never had any problems on any of my bikes with plugs, but it's nice to learn new things. But it did get me to look into the Denso's.
 
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