Iridium IX

I’ve used iridium plugs in most of my vehicles for at least 10 years. Never a problem. They fire when conventional plugs can’t and they’re compatible with all electronic ignitions, AFAIK
 
I have been using NGK BR8EIX in place of BR8ES on my 500 single, for over 5 years, with good results. It used to, inexplicably, kill the BR8ES plugs with regular monotony (11.3 comp ratio) - sent failed plugs to NGK technical without promised feedback.
Never had a failure with the iridiums though.
I had assumed that the heat range numbers were the same - so, on the Commando (BPR7ES) I would use BPR7EIX.
I seem to remember that NGK had an on-line cross-reference chart
 
I use the BPR7EIX on my Commando and a B44, never had plug fouling or plug dying issues,
 
Yea. I could use the cross reference....just making conversation and appreciate the feedback. Im using them on the 961. 7500 miles. Not failing. Might change them out of boredom.
Cheers. The bonnie has new coils and plugs since May and is running like a Swiss watch. Did a beautiful 140 mile run on Sunday.
 
I could tell when the iridium plugs needed changing in my 961 as it became less perfect at starting. And they did not last long in that bike. A good track day would take the edge off of plugs that were fitted new for the event. And before you ask, I have no idea why!

Glad to hear the ole T140 is providing good service and feel good factor. Probably the most underrated classic bike out there IMHO.

Although mine is currently in surgery with the primary disemboweled ... :rolleyes:
 
What about non resister spark plug caps or am I unright thinking EIX plugs only come in R for resistor ?
 
only come in R for resistor
NGK Iridium are only found in resistor form, Denso may do a non resistor Iridium plug but not spent too much time looking.

Here are 3 non-resistor Denso Iridium plugs, no idea if they X ref to Brit bikes


IW06-34
IW06-31
IW06-27
 
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I could tell when the iridium plugs needed changing in my 961 as it became less perfect at starting. And they did not last long in that bike. A good track day would take the edge off of plugs that were fitted new for the event. And before you ask, I have no idea why!
Were you using race fuel or pump gas? ( at the track)
 
NGK Iridium are only found in resistor form, Denso may do a non resistor Iridium plug but not spent too much time looking.

Here are 3 non-resistor Denso Iridium plugs, no idea if they X ref to Brit bikes


IW06-27
IW06-31
IW06-34

This is for the black bike, the Brit bikes have Denso's. (But did have a T140 in 1985)
I have to wonder if there are older bikes out there running resistor plugs and resistor caps but can only assume modern bikes running EIX plugs have coil units directly on the plug that may not have any form of resistor ..........or maybe you can run a resistor cap and plug with no adverse effect ?

ddd.jpg
 
Or you could just take the resistor out and replace with a short piece of HT copper core.



No idea if this also works for NGK.
 
Or you could just take the resistor out and replace with a short piece of HT copper core.

No idea if this also works for NGK.

I'm not sure I am that keen or brave.
If the T140 in question has non resistor spark plugs (and likely resistor caps if so) and then went to a most likely resistor EIX or similar, the caps would need swapping to non resistor versions ?

If not I wonder what the effect is of that ( double resistor)
I had not given it a second thought and have swapped plugs randomly in the past with no regard (or knowledge) to resistance then.

There are probably plenty of bikes out there with both.
Google did not really reveal an answer to that as far as any possible down side.
 
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