The reason I said "slight" is becuase I've heard of big jetting changes all the way to no jetting change. So I said you may have a slight jetting change, based on the average of what I've heard.
D34 expressed his doubt in my jetting in my previous post about these plugs, that's why i was sarcastic, and I probably shouldn't have.
I don't know his setup or why he didn't have a jetting change, and I'm not concerned why, but I did have a lean condition after changing the plug; I did not have a lean condition before, and I know of a few other people that have had a similar experience. I run a single carb, and that's possibly why I needed a much larger jet, due to one carb feeding two cylinders.
Scott