I'd be happy if my plugs looked like that! What got me was the Formica, wood and sink detail. It looks just like mine! I looked up your boat and I was right.
Plugs look rusty and they do not match any real read is just a guess. What are the heat ranges and in which cylinder did it reside.
I'd try 4 of the stock plugs as I do see one, gap them a .035 with points or .040 with an E/I. Run them for a couple of hours and let it idle for 5~10 minutes before shutting down then do a plug read~~far more accurate.
The color on the tips does look good but that is an odd combination of plugs for one engine.
Your #1 looks a bit sootier than the rest, which is how mine look too. You MIGHT be running a bit rich. But you might be OK with that, as it makes the engine easier to start cold. My engine ALWAYS starts with the choke closed, and keeps running when the choke is opened instantly after starting. Leaner engines are harder to start and need the choke in for a few more seconds, but get slightly better mileage (nautage?).
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