SOHC.co.uk Forums > CB750

Spark Plug

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Martin6:
I spent a very pleasant afternoon in the garage today, chasing down my warm tickover issue (off the choke).

A basic question: One thing I noticed, the manual specifies NGK D8ES plugs. David Silver sells  DR8ES and this is what I have on the bike. Does the 'R' mean resistor? I also have 5k-Ohm plug caps. Is it OK to run resistor plugs together with resistor caps?

Thanks, Martin

Nurse Julie:
No, you either use resisted plugs OR resisted caps. The usual combination used is D8EA's with NGK resisted plugs.

Erny:
What I know, that R really means resistor, but not 100% sure. And running resistor plugs with resistor caps is definitely not OK.

You can confirm if plugs have resistor by measuring them with multimeter

K2-K6:
I feel they work fine together,  there's debate to be had but one forum member won't let that happen  ::)

Sesman:
Mine works fine with resistors in both….at least for now. I’m also confident that if those on this forum have experienced issues, they certainty exist.

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