I was running a little rich (black plugs) so I decided to play. Went to 150s and lost no power and plugs are a little cleaner.
I believe the TBS needles 'caused' the rich condition which I swapped to cure the mid-RPM slump.
However, I have never fouled a plug in the true sense of fouling a plug in Raven.
Mike, are we talking about your plugs being REALLY black or are you actually fouling a plug (aka a short between the electrodes)?
As I know it from my two-stroke days, when you foul a plug, you lose that cylinder...
