[maverick9611]

Originally Posted by jkv45

Read this article - https://www.enginebasics.com/Engine%...k%20Plugs.html

"Jetting = the air/fuel mixture ratio shows up on the base ring (the last thread ring, it has the strap welded to it). You want a full turn of light soot color on the base ring!!! If you want to tune for max. power, then you want 3/4 to 7/8ths of a full turn of light soot color to show up on the base ring, but this is on ragged-edge of being too lean, but will make the most HP on most engines. To be safe, leave it at a full turn of light soot color. If the base ring has a full turn of color, but there are "spots" of heavy build-up of "dry soot" on top of color, then jetting is too rich .

NOTE> If the base ring has a full turn of color with some spots of heavy dry soot, then jetting is too rich, REGARDLESS, if the porcelain is "BONE-WHITE", jetting is still TOO RICH !!! NOTE> Do not look at the porcelain to read jetting !!!"

I'd say they are rich overall. The plug is showing an average of all the jetting, not just the main jet. I don't see any reason you should need a richer main jet than the original, which, as previously noted, is generally considered too rich in the first place.

good info, thanx for sharing.