Plugs keep foiling up

[bobcowan]

Originally Posted by kennyhbh

Hi guys. change the plugs still having the problems. gap 55 . running msd. change out the cap and rotor . swap in a different 6al msd box . wont hold a idle have to keep pumping pedal keep it running, at higher rpm i can here it miss fire. side pipes are black carbon. also the plugs that i took out weren't filled with carbon.

Gap is too big. Bring it down to about .035" or so.

So probably not too rich, and probably not oil fouled.

But you might consider going one heat range colder if they foul out that quickly with a smaller gap.

You could also consider cutting the ground electrode back like in a racing plug.