77 Johnson 35 problems

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  • wiscoboater


    Replies: 739
    Topics: 126
    #19469

    Ok, no video yet but a day of poking and prodding reveals the noise is coming from under the flywheel area. I’m starting to think what I’m hearing is the reed plates flapping. The motor starts and runs beautifully and revs up great. Going in and out of gear does not change the sound, so that’s why I’m thinking reeds. Putting the air silencer box back on and the cover quieted it down as well. I have it’s 30hp evinrude twin..although a bit newer right next to it on the rack. Tomorrow I’m going to fire that one up and do a comparison. Will keep you posted fleetwin and chris p.


    fleetwin

    US Member - 2 Years
    Replies: 4737
    Topics: 46
    #19491

    Good, I’m glad you didn’t rip that gearcase apart. Like I say, those engines are normally pretty noisey. Your newer 30hp is probably quieter than the 1977 35hp.
    Sometimes these engines have a bit of a "ringing noise" as well, never really figured out just what that is. But, I would definitely pull that flywheel and look for evidence of magnets rubbing on the components. Probably a good idea to remove the mag plate, clean and relube the bushings, replace the plastic bushing: 322435


    wiscoboater


    Replies: 739
    Topics: 126
    #19515

    How do you adjust idle speed on this motor?


    fleetwin

    US Member - 2 Years
    Replies: 4737
    Topics: 46
    #19521

    There should be a plastic threaded/spring loaded screw that threads into the lower throttle gear under the vertical throttle shaft leading up to the mag plate. Screwing the spring loaded knob/screw in or out sets the idle speed. Unfortunately, these plastic screws are usually broken/jammed.


    chris-p


    Replies: 2456
    Topics: 153
    #19524

    I get mine here

    http://www.nymarine.ca/miscparts.htm


    wiscoboater


    Replies: 739
    Topics: 126
    #19537

    OK, just a stupid question here. Why not replace the nylon screw with a stainless one with a nylon cap? I’m sure there is a reason… But like I said, This big a motor is new to me.


    chris-p


    Replies: 2456
    Topics: 153
    #19540

    Ive seen it replaced with a number of contraptions!

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