Re: 1957 Johnson 35hp Carb problem low speed plug

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July 21, 2015 at 12:35 am #20500
gjonz
Participant

    Respectfully disagreeing with George on this. I don’t believe the OMC Big Twin carbs of this vintage have removable high/low speed seats. If the seat gets damaged, the carb body must be replaced as they are cast into the carb body.

    The insert the OP referred to is simply an aluminum tube that is threaded inside for the low speed needle. The packing and packing nut holds everything tight as described.

    There is a brass jet inside the bowl that can be dicey getting them out. And also the float needle seat can be iffy with the wrong screw driver.

    I have seen carbs with what George is describing, but the 50’s OMC’s do not typically have that design.

    Greg

    Greg