Re: Mid 50’s Johnson 25HP runs like crap. Advice needed

Home Forum Ask A Member Mid 50’s Johnson 25HP runs like crap. Advice needed Re: Mid 50’s Johnson 25HP runs like crap. Advice needed


jerry-ahrens

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Replies: 986
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#76080

Don has a good point.I would try to run the engine full throttle, while tuning in the high speed needle till it leans way out. Then adjust it open till it runs smooth. If that works, THEN you can move on to the low speed needle adjustment. I noticed that you are moving back and forth between the high and low speed needles…. trying to adjust the carburetor that way won’t work. Do the high speed needle first, before moving on to the low side. Having said that, I think you may also have a reed valve problem as well, or something else going on. If it were me, I’d try to adjust the carb properly first, before moving on. If your quick and on your toes, you can get that high speed needle adjusted fairly close in a test tank…. at least close enough to be able to adjust the low speed side