NGK plugs for 500

[McCabe-Thiele (Ted)]

I have no idea when or where I bought them - I have a set of new NGK DR7EA plugs.
DS show the 500 plug as NGK DR7ES.

Can I use these DR7EA no idea what the S means compared to A ?

[deltarider]

So far nobody knows. Why did you choose 'R' plugs?

[Johnwebley]

I don't think ES are available,
The DR are resistor plugs
Could cause issues if used with resistor plug caps

That leaves D7EA,
Or if you ride harder D8EA

same as 400 and 750,

I use Denso equivalent, and an very happy

Sent from my SM-A546E using Tapatalk

[Bryanj]

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

[McCabe-Thiele (Ted)]

So far nobody knows. Why did you choose 'R' plugs?

I have no idea, I can't remember when I bought them either.

I do have a set of Denso X22ES-U plugs.

I think my bike had  NGK D7EA fitted .

[McCabe-Thiele (Ted)]

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

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