Fuel and oil, yes. Water? That's a bit confusing. The air intake is just that, and shouldn't have any cooling water near it, same for the carbs. I suppose that there could be a water leak that is "spraying" water into the intake, and when you pulled the cover, you saw it dripping back out.
Pull the plugs an see if 1) they're all the same color, and 2) if one if them is wet. Water in the cylinder will clean a plug, old timers trick to get rid of fouling is to spray a fine mist into the intake while the engine is running. Pull the float bowl and see if there's water in it. Pull the fuel line and squirt a bunch of fuel into a mason jar and look for water. Put the muffs on, or drop it in a barrel and run with the cover off an see if you can see anything leaking or spraying.
If it's idling well, and not leaning out as the throttle opens up, I'd be inclined to think it's an external source rather than internal
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-Steve
"Oar Chasm!"
1977 Wellcraft V20 Step OB cuddy. 1971 1350 Merc
"Any damn fool can navigate the world sober. It takes a really good sailor to do it drunk."
- Sir Francis Chichester
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