Club 80-90 Forums

bosch super 4 spark plugs - do i set the gap before installing or are they already set?

they're wr78.

if so what's the gap size to set them with the feeler guage?

there's a lot of faps to set if so?

many thanks.

You can't adjust these as the four electrodes go around the centre and not over the top as with a traditional spark plug.

This is where advice gets a little contradictory........original plug gap is 0.7mm and these long life 4 electrode types are pre-set and non adjustable at around 0.9mm (certainly more than 0.7mm) what can I say.
I've used the Tri electrode type with good results however, I did have a plug lead break down whilst using them..could have been coincidental.

Martin