I bought a fishing rig last fall &, of course, took her for a test spin before I bought it. The<br />'90 25HP Johnson purred like a kitten. When I was putting new plugs in this spring, I noticed he hadn't been running the recommended plug in it.<br />This engine is supposed to take QL77JC4 gapped at 0.030". What was in there was NGK BR4HS gapped at 0.025". This plug isn't even the NGK equivalent of the Champion plug. My question is why does the motor run better on this maverick plug than with the Champion plug that it calls for?