Never tried a smaller gap with SAG ing plugs since the gap is not adjustable on the NGK BUR 7/9EQ plugs I was using. By the time I got SAG the first time, the center electrode had burned down to the point where the gap was almost .100". Amazing that the engine ran as well as it did.
BTW, comming up on 250 hours on Iridium plugs with no SAG yet. Very little 100LL fuel used though.
Tracy;
Explain to me further: Are you using BUR9EQ leading and 7EQ trailing? What is the part # of the iridium – same? 250 hours on one set of plugs?
I’m happy with the performance of the B9EGV, and have never experienced SAG – I also use little 100LL (and they seem immune to fouling due to flooding); but I’m not impressed with how long they last.
Al G