Re: 1972 Johnson 2hp – low speed and idle problem

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July 19, 2015 at 11:10 pm #20421
stan-k
Participant
    quote Mumbles:

    Check the throttle shaft for wear where it goes thru the carb casting. Any excessive up/down forwards/back play here indicates a worn casting or shaft which will allow a vacuum leak at idle. The amount of leakage here seems to be more critical on the smaller motors.

    I checked, and the throttle shaft has no play at all. Actually the carb is in good shape…that’s what’s so puzzling.
    In the next couple of days I’m going to re-assemble the motor and do a compression test before doing anything else.

    Thanks.