NGK plugs

[Bryanj]

I have managed to aquire a few D7EV for my 500, originaly used on advice a a gentleman named Stan Dibbden who was the NGK and Mobyke rep in the 70's ( and a VERY respected ex racer), started cleaner ran faster and more mpg. No longer made but found some

[mike the bike]

In that case, would a D7EA work better than a D8EA?

[Bryanj]

On a 500 probably

[JezzaPeach]

D7EA with resistor caps certainly working for me. 500/4 K1 with DSS coils.