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1970 evinrude 25 hp runs in gear but won't idle

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  • 1970 evinrude 25 hp runs in gear but won't idle

    25 hp 1970 evinrude will just sputter and cough when i try to start it. It will limp along if i spray a little gas directly into the carb. Put it in forward and it will start up and run.


  • #2
    Re: 1970 evinrude 25 hp runs in gear but won't idle

    i would start by rebuilding the carb sounds like a fuel problem check the hose from the tank and make sure that is in good cond.

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    • #3
      Re: 1970 evinrude 25 hp runs in gear but won't idle

      I have good gas from tank to carb. Took carb off and disassembled everything looks good. Motor runs well in gear, it just won't start and idle. What am I missing?

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      • #4
        Re: 1970 evinrude 25 hp runs in gear but won't idle

        The idle circuit of the carburetor *must* be clogged. It's passages are tiny and you cannot inspect them with a simple disassembly. Disassemble the carb, soak it in carb cleaner, and then blow out the passages with compressed air.Have a look just above the throttle plate in the carb's throat. You'll see two or three tiny holes there. Those are the idle orifaces.Is the carb adjusted properly? Start by turning in the idle mix control all the way in (gentle) then turn it out 1 and 1/2 turns. Start the engine and turn in the control slowly until you get the best idle. Then put the knob back on.Good luck!

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        • #5
          Re: 1970 evinrude 25 hp runs in gear but won't idle

          I have the same motor with the same problem. I just wen't out and adjusted the carb 1 1/2 turns out and nothing happen. I wen't out from there and it just got worse. So I started at 1 turn out and went back in. I got just a little under 1 full turn and it runs PERFECT now! So glad it was an easy fix! Thanks for your help

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