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  1. #1
    Member 86 inches's Avatar
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    Idle rpm 94 Johnson 225 Venom

    What should the idle rpms be for Johnson 1994 J225STLERK. Seems like it used to idle at 700 or so. Just came back from the shop. The mechanic replaced the spark advance and set the idle and told me all was good. But I just fired it up in the driveway and its idling at 1400. Seems high. Should I try to adjust it or wait til I run it at the lake this weekend. I let it run for a good while but the rpms didn't drop. I thought these motors idled high until they warmed up and then dropped down automatically.
    1994 201 Champ re-powered with a 250 HO G2 E250LHAFA 05438419


  2. HYDRA SPORT LS205 225HO JER-1 BIG BASS's Avatar
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    #2

    Re: Idle rpm 94 Johnson 225 Venom (86 inches)

    Once you put it in the water lake it will be under more pressure, and will idle a bit lower, I kinda thought rule of thumb for me is set it about 200 rpm,s in the driveway on muffs above where you want it to be when in the water it will drop once sumerged.
    BIG BASS

  3. HYDRA SPORT LS205 225HO JER-1 BIG BASS's Avatar
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    #3

    Re: Idle rpm 94 Johnson 225 Venom (86 inches)

    750 OR 800 I would think
    BIG BASS

  4. Member
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    #4

    Re: Idle rpm 94 Johnson 225 Venom (JER-1 BIG BASS)

    Sounds like he didnt readjust the timing.

  5. Moderator SEAHORSE's Avatar
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    #5

    Re: Idle rpm 94 Johnson 225 Venom (86 inches)

    Out of the water, using a hose, the engine idle on those motors will be high 1100-1400 rpm due to the lean running. In the water, with exhaust backpressure and in gear, the idle rpm should be 650-750 using an accurate tach.
    -----


    A Technical troubleshooter possessing more tools than talent !

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