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Merc with choke problems

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I have a 25hp Mercury, circa 1983, that is having problems running. The marine shop has put a lot of new parts in but says that the motor won't idle unless the choke is all the way out. When it does run, it's only at full throttle. They've cleaned the carb 3 times and put new gaskets, seals and plugs in. Anyone have a clue as to what's wrong? Help would be appreciated. Thanks.

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It sounds like a new motor with an old cover with all those parts. That is a tough call, I don't know off hand what else you would try. Good luck

Ely lake expert

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Have you tried hooking it up to one of those
garden hose kits?? I had a buddy,whose merc would run great when it was at his house
running with the hose attached.Idle down
fine and stuff,but then when he got to the lake,it acted as you are describing yours
does.It was some kind of reed valve or something in the lower end being the culprit.
His was a twenty horse also an eighties unit.
Hope this helps..........

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