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

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July 19, 2015 at 4:51 pm #20391
Mumbles
Participant

    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.