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I can give you a partial answer. These bigger engines will sometimes have an adjustment screw that you can adjust the high speed idle. It sounds like it is getting too much fuel when it is at higher rpm. You will have to play with it until it evens out. I wish I could tell you exactly how to do this. I have just never had the opportunity to work on one of these engines.
Wrong!!! There's no such thing as a high speed idle. You need to adjust your carburetor so it runs a little more rich (your currently to lean). Just take the spark plug out and have a look at it. If it's white and your engine is producing a light blue smoke from the exhaust it's to lean. If it's black and your engine is producing excess black smoke (your be able to smell the gas) from the exhaust it's to rich. When you have it adjusted just right the spark plug shoud have a nice brown color to it.
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What year is a Mercury outboard 20HP serial number 4147712?
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What is gas ratio for 1993 evinrude 20hp?
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