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By knapdog
#85533
I've just ordered a NKG BPR6EIX Iridium plug for my 2018 Classic 500.
The Hitchcock's catalogue recommends that these are best used with a spark plug cap WITHOUT a resistor.
Is the standard cap fitted to the bike WITH or WITHOUT a resistor?
There is a silver metal cap in the catalogue ( part 500905) that I have seen used in a video with iridium plug but confusingly, in the catalogue it is describrd as being WITH resistor. Is this an error?
By Daiwiskers
#85547
Can't help with the cap fitted to your bike
But I have read recently that NGK now recomend using both resister plug and cap
Sorry if I have confused you further
Cheers Dai
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By Haggis
#85549
From the factory the bike comes with a 5k ohms resistor plug cap and a resistor plug.
The OEM cap also has a metal shield, no idea why?
Your chosen plug has a 5k ohm built in and will work fine when paired with a resistor cap.
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By knapdog
#85560
After contacting Hitchcocks I can confirm that NGK have informed them that the standard plug cap fitted to the bike is compatible with the iridium plug.
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By Adrian
#85561
Given that we now have much improved ignitions compared with 60 or 40 years ago I suspect it makes next to no difference on the present models. For older ignition types, I think I'd still use non-resistor plug caps with R plugs or vice versa.

A.

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