Quick background, I changed the spark plugs this weekend on my 60hp Mercury 4 stroke. This is something I've never done. I got the champion plugs from Orilleys. I had never gaped plugs before so they did it in the store for me. This was a fairly easy change, it took me less than 15 minutes to change them all. When I went to the lake last night for the first time I notice when the boat is in neutral it has a different sound to it that it usually does now? When i drop it in gear it sounds fine though and seems to run more responsive and and overall I thought it ran fantastic but when you put it back in neutral it sounds weird to me. I attached a video we shot. Any ideas what I might of done wrong if anything? I did pull the spark plug wires off with some pliers but i don't think that would have caused any issue for noise? It's kind of that click click click sound you hear.