I just fitted some NGK Platinium BP7EVX to my Norvil Commando with great results.
I had a blast to Brighton for the Rockers Reunion Ace Cafe Do this weekend & found the throttle response & pickup improved & first kick starting hot or cold.
Had a look at the plug colour & its perfect both sides so I would recommend these plugs.
I'm currently running the standard NGK's (BP7ES). I see that the Iridium plugs are resistor types...if this is true, are there any negative issues using the Iridium plugs with an electronic (Sparx) ignition??
The Platinium type I am using NGK BP7EVX has no (R) in the part number so I don't believe this is a resistor type plug.
My bike is fitted with Boyer ignition so I can't see yours having a problem with the Platinium type plugs.
Give it a go I am sure you will be pleased with the result
I know that this is an old thread, but had to research the iridium vs copper plugs, since I had some plug fouling issues. I found this:
Copper Spark Plugs
Copper spark plugs are generally considered to have the best performance of any spark plug type. This is potentially different from what advertising companies suggest, but the other metals are, unfortunately, not as conductive in general as copper is. Platinum and iridium plugs are more likely to overheat, which causes damage to the plug components and can compromise the delivery of the spark to the engine block.
Gold Palladium wire electrode. As the wire slowly deteriorates. it forms a tiny gold mushroom on the tip. You can run 'em until the wire gets down to the insulator. Sadly no longer in production. Recently scored a stash of NOS.
I've been told they give the advantage of a hotter plug without the risks.
Jeez, N4G....I had a handfull back in '78, given to me by the Champion rep at the Earls Court show where I had my race bike on display, yep they were good. That was where I first met Peter Williams.
He gave them to me after I told him that I had been given a box of Autolite race plugs and they had a 50% failure rate.
I also had some N64Ys, box full, used once for dyno runs in Cosworth DFVs at BRM in Bourne Lincs. The alternative to the N4Gs and N64Ys was the N57R, but there was a possiblility of fouling if used from cold.
But, like this thread, this is history, today I run Denso IW27s.
I run Iridiums, would not change back now. Beware there are a lot fakes out there, two branch members had been caught out. If you have both in your hands the fake is the considerably lighter plug. I swapped my plugs into a bike at a meet and it proved instantly it was the plugs and nothing else.