That needle coming in at an angle on top is your idle adjustment screw. Turning it out leans the mixture. Usually it is turned out at least 1 full turn from the seat, often 1.5. Your setting of .5 is probably the reason your plugs are sooty. Try turning it out while it's running until it runs rougher, then back in until it sounds good. Moyer sells an extended needle so you can turn it with your fingers. https://moyermarine.com/product/idle...fcar_02-1_508/
Nobody's laughing, this is how you learn your engine. Here's your diagram, good luck!
Nobody's laughing, this is how you learn your engine. Here's your diagram, good luck!
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