Wisconsin M RBM poppet valve carb

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  • bobw

    US Member - 1 Year
    Replies: 1592
    Topics: 48
    #246276

    Great piece of work. Hope that helps turning it into a runner.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20
    1957 Evinrude Fastwin 18

    "Every 20 minute job is only a broken bolt away from a 3-day project."


    The Boat House


    Replies: 3619
    Topics: 91
    #246278



    What Bob said. The pictures really add to
    your description as you go through each step.
    Tubs

    You're only as smart as the person you're talking to.


    Buccaneer

    US Member - 1 Year
    Replies: 5195
    Topics: 840
    #246280

    Thanks. Hopefully I can drill that little hole in the valve stem without
    incident and perfectly centered. Some days that’s the hardest part
    on the job.

    Prepare to be boarded!


    HARRY D. NICHOLSON

    US Member - 2 Years
    Replies: 48
    Topics: 2
    #246282

    If your new valve is heavier than an original valve, it may cause trouble. If there is a spring that holds the valve down on its seat, like in ruddertwins, it may be a replacement, try leaving the spring out.


    Buccaneer

    US Member - 1 Year
    Replies: 5195
    Topics: 840
    #246286

    If your new valve is heavier than an original valve, it may cause trouble. If there is a spring that holds the valve down on its seat, like in ruddertwins, it may be a replacement, try leaving the spring out.

    Harry, thanks for the tip. I had a passing thought the other day about
    the weight of the new poppet valve. There’s a digital food scale around
    (last used for weighing grout to mix up!) that I could check for kicks.
    The spring on the old poppet valve is from an Elto Ace, I used to
    replace the non – original, sad looking spring that was in it.

    One can observe the bottom of the valve stem to see if it “bounces”
    when the flywheel is rocked, so when I get it back together, that
    will be my first test.

    Prepare to be boarded!


    joecb

    US Member - 2 Years
    Replies: 505
    Topics: 63
    #246314

    Bucc, I have to complement you on both your skills and level of perseverance. On occasion, I too have invested way too many hours in some nit of a problem to ever have made it a “paying proposition”. It’s a darn good think that we do this stuff for fun.
    NOW, we still have not answered the question , is the mixer threaded in or pressed. I have to believe that its threaded.

    ALSO, for future reference, when confronted with a similar problem on a mixer that, fortunately had a mounting flange, I set up the mixer in the lathe. Mounted on the face plate on a small 90* angle plate. So set -up, indicate the poppet seat and the cap face to ensure all is square and concentric. Then with a SMALL boring tool, clean up the poppet shaft bore to take a bushing, Also clean up the poppet seat if necessary.

    Regards,

    Joe B

    PS, and as always, thanks , T2 for the input


    Buccaneer

    US Member - 1 Year
    Replies: 5195
    Topics: 840
    #246320

    Joe, that sounds like a real challenge indicating your poppet valve on the lathe.
    Had I got the carb off the cylinder, I might have tried to ream out the valve guide
    in the milling machine, but there’s nothing “square’ on that carb, and don’t
    have any idea “how’ I would have mounted it.
    All said and done, I think the guide I made worked okay.

    I was gone most of the day, but managed to drill the hole in the poppet valve stem
    in the milling machine, but every thing else was done on the lathe.

    Not sure if it was an original feature on the Wisconsin, or other brand poppet valves,
    but besides the spring inside the poppet valve body, there was a small exterior spring
    on the bottom of the stem that extends from the bottom…. hence the small cotter key
    hole to hold the spring in place.
    I’ll have to look at some “file” photos of Wisconsin’s and see if they have a bottom spring.

    I installed the main, internal spring, and the poppet valve dances nice when the engine is
    spun over.

    If I get a chance tomorrow, as long as the tank is off the engine, I’m going to be sure
    it’s free of any “crud” inside, then try to make a brass screen that goes inside of the
    tank, vertically from the bottom 1/8″ pipe plug drain.

    Prepare to be boarded!


    stanley

    US Member - 1 Year
    Replies: 474
    Topics: 107
    #246353

    Thank you for taking the time to share all the steps you’ve taken to bring this engine back to life.I look forward to each mornings cup of coffee and your latest adventure.

    • This reply was modified 2 months, 4 weeks ago by stanley.

    Buccaneer

    US Member - 1 Year
    Replies: 5195
    Topics: 840
    #246357

    Thank you for taking the time to share all the steps you’ve taken to bring this engine back to life.I look forward to each mornings cup of coffee and your latest adventure.

    • This reply was modified 2 months, 4 weeks ago by stanley.

    I’m glad someone enjoys my Follies, Misfortunes, and occasional Triumph”.
    I enjoy everyone’s else’s similar threads on their projects…….
    much more interesting that “What’s it worth” questions!

    Prepare to be boarded!

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