Author Topic: Iridium spark plugs  (Read 165 times)

Offline a101960

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Iridium spark plugs
« on: 17.05. 2019 11:05 »
I have read that resistor spark plugs can give the magneto a hard time. I would like to replace my standard plugs with iridium plugs, but the only equivalent is NGK BR7EIX a resistor plug. Would this be OK or would it lead to mag failure? I have seen on Youtube a way to convert resistor plugs to not resistor plugs which entails heating the plug, unscrewing the top and removing the resistor and substituting a length of copper wire. Has anyone actually done this?

Offline JulianS

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Re: Iridium spark plugs
« Reply #1 on: 17.05. 2019 13:33 »
I used Denso IW22 iridium plugs in the alloy A10 for about 2 years. Bike really liked them and seemed to run cleaner. Mag did not mind them either.

However the plugs did not seem to like the mag and over those years 8 plugs failed, maybe the high mag voltage did for them?. They are expensive and at that rate of attrition were unaffordable. Now back to non iridium plugs.


Online RDfella

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Re: Iridium spark plugs
« Reply #2 on: 17.05. 2019 14:35 »
Anyone who thinks resistor plugs or plug caps make no difference should read the Brightspark website.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Online muskrat

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Re: Iridium spark plugs
« Reply #3 on: 17.05. 2019 20:24 »
G'day a101960.
Seems silly paying all that money for an iridium plug and then have to pull it apart and modify it. For around the same price the NGK B8EGV gold palladium  is non- resistor plug I used in my A7SS racer.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online Joolstacho

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Re: Iridium spark plugs
« Reply #4 on: 18.05. 2019 01:05 »
Mythbusting... Iridium plugs don't perform any better than normal plugs,
They just last longer.

Online muskrat

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Re: Iridium spark plugs
« Reply #5 on: 18.05. 2019 09:02 »
G'day Jools.
That's why I put Iridium in the rear bank of the wife's V6 Magna (normal in the front). Recommended replacement 100,000Km (2 hour job).
I dobn't know if EGV's last any longer. Mine did only 50 -60 miles before the bin on the racer. Plugs are cheap winning is better !!!!
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7