It's funny, I used to gap my plugs on everything;car, bikes, outboards, even the damn lawnmower. When I got into skis I found that the factory gaps were very consistent on the NGKs versus the Champions I ran in all the other stuff, so I didn't gap them any more for the skis. BUT, a few weeks ago I pulled and regapped the plugs that were in the SJ. Typically the stock NGK gaps were .030 to .032. I regapped to .026 based on some input I got here on the X. The ski feels like it runs a little stronger. Now this could be just like that feeling you get after an oil change in your truck and all of a sudden it feels like it runs better. Or it could be that it is cooler out lately which is making the SJ run a little better. But, who knows? Maybe it did help. And for the 5 seconds per plug it takes to gap them, I'm gonna do it from now on.