NGK Iridium are only found in resistor form, Denso may do a non resistor Iridium plug but not spent too much time looking.only come in R for resistor
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Were you using race fuel or pump gas? ( at the track)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!
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
IRIDIUM RACING - Specifications | Products | SPARK PLUG | Automotive Service Parts and Accessories | DENSO Global Website
IRIDIUM RACING brings out the full potential of your engine to help you achieve victory. With its superior ignitability and sparking voltage, it eliminates ignition failure and misfiring in various operating areas. The result is a dramatic improvement in mileage and increased engine power.www.denso.com
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Were you using race fuel or pump gas? ( at the track)
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.