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25hp johnson outboard motor was completely rebuild with new plugs and wires ,rebuilt carberator, new fule pump, new points and condensers. motors starts up and runs failly good and runs and 3/4 speed ok. but when opened up to run at full speed stalls out, but if speed turnd down engin will still keep running. seems to stall out at trying to hit high end of speek.tanks and hoses all new.

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  • josephandes Jul 02, 2009

    gas tank vent was open, motor does not stall out. can run motor at 3/4 speed without stalling. only stalls out when trying to run at full speed. is there a secondary ckt of some kind that kicks in when throttle is turned completely open at high end. carb was rebuilt kit new plugs and wires new fuel pump new hoses points and condensers replaced. new gas tank and ball hose replaced. runs ok until hitting high end.

  • thomas foster
    thomas foster May 11, 2010

    make sure your vent on your gas cap is open

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I would check if the fuel hoses are big enough diameter AND the fuel level in the carburettor is high enough...

Posted on Sep 25, 2017

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SOURCE: 1974 johnson outboard motor 25hp stalls when hiting high end

Not familiar with that specific motor but had similar vintage smaller HP Johnsons. From my experience it sounds like it could be that the high speed carb adjustment is too lean. What I would try is running the backing off the high speed screw 1/4 turn to 3/4 turn, then test. If works better, screw back in in 1/8 turn increments until the problem recurs, then back out 1/4 turn and leave it there.

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SOURCE: wiring diagram for 1982 Mercury 6cyl outboard tilt

go to ebay and buy a manual

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1974 johnson outboard motor 25hp stalls when hiting high end


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