Rich Carb

I have a 650 Eddy carb on my other wise stock 340. I think it is running on the rich side. When I start it in the morning it does fine. Then after it worms up fully it boggs off of idle. I have put in pic's of the plugs. What do you think? I have a jet kit coming. It should be here on friday.

My Question is, what do I do? I have never opened up a carb befor.
I know I need to lean it out but do not know how. can one of you walk me through it?

Thank you for any help, Russell.

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