The mower has run great for the past few years. I use non-meth fuel and have on-off valve to allow running fuel out after mowing. This year it has started running rich at idle, black smoke, and choke is fully open. Without removing carb. the only adjustment screw visible is for idle speed. I am a 71 year old retired/disabled auto mechanic/shop owner of over 45 years. So I am familiar with carb rebuild and adjustment procedures ... if any! Any suggestions appreciated!
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