SOHC.co.uk Forums > CB500/550

NGK plugs for 500

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McCabe-Thiele (Ted):

--- Quote from: Bryanj on May 15, 2024, 10:01:21 PM ---Ted, if you can find any D7EV are the dogs doodads for the 500, it should have had newish D7EA in it when you got it, D7ES is the original and not available the A is same as S according to NGK. You should not be using the R type

--- End quote ---
So a resistor spark  plug when you have resistor plug caps does this cause a problem somehow ?

deltarider:
Not necessarily, but realise you'll then have a total of 20kΩ resistance in a circuit... Personally I consider that a lot and it is not needed. The French manual, that has been composed in colloberation with Honda France, advises to replace plugcaps when they read 8kΩ or more. Claims made by some members of the international forum - and nowhere else! -that adding resistance is benificial for spark duration, have so far remained unproven. And even then it remains to be seen it will effect in better running.

Seabeowner:
I ran resistor plugs and caps for years and didn't have a problem. I think DSS sells the R plugs for the 500. But I must admit I now use non R plugs.
My 71 500 came with 7.5k plug caps from new I believe.

K2-K6:

--- Quote from: Seabeowner on May 16, 2024, 06:28:07 PM ---I ran resistor plugs and caps for years and didn't have a problem. I think DSS sells the R plugs for the 500. But I must admit I now use non R plugs.
My 71 500 came with 7.5k plug caps from new I believe.

--- End quote ---

I've not experienced the purported problems that's often attributed to doing this either.

Often given out as a "No no" but without substantiated evidence to prove there's inherent problem by doing so.

I'd run them Ted, then you'll get at least personal experience of this with your own setup.

McCabe-Thiele (Ted):
My experience on cars before individual coil packs arrived was that many used resistor caps and resistor plugs without problems with one coil on 4 & 6 cylinder engines so it's a new thing for me to consider it.

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