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https://www.youtube.com/watch?v=MfTpU6HS4cA
see around 11:00 idle passage
https://www.youtube.com/watch?v=MfTpU6HS4cA
no expert on Merc carbs but when I had a problem idling a small 4hp Merc a few years ago it was suggested I properly clean the idle passage (small tube) and that instantly fixed my idling problem !
you indicated the engine dies at low rpms below 1200-1400 indicating a likely fuel supply problem ( timing issues aside if nobody messed with timing and idle stop adjustment etc…)
your initial post (top) does not say you fully took care of cleaning ALL carb passages and as per M.Anfossi’s suggestion… that may be your easiest option.
easy stuff first ! btw my boating life years ago included a Merc 500 and a Classic 50 (45hp) 4 cyl. and both were superb idlers…all day long. I have since moved to ETEC technology 75hp 🙂
btw please post exact mdl and ser# !!!
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