1937 KA-37, 9.3 hp Johnson, won’t start

Home Forum Ask A Member 1937 KA-37, 9.3 hp Johnson, won’t start

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  • Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 7523
    Topics: 1073
    #285273

    It has new rings now, but I never had it running before the new rings.
    Compression 98 & 95 psi, which is about the same as my KS-15
    that starts easy.

    Went through the magneto, did a coil swap for one cylinder, new capacitors.
    New sparkplugs showing nice blue spark.

    Carb throttle spool / valve may be a little sloppy, but maybe that’s
    just the way they’re made. I tried swapping carbs with the KS-15,
    but they’re different, and won’t swap.

    I switched magnetos with the running KS-15, and it acts the same,
    like it’s only “hitting” every once in a while. I tried enriching both
    high and low speed needles, which didn’t seem to help. When I choke
    it, it seems to be getting excess fuel and will quit firing.

    Before swapping magnetos, I removed the carb and poured some two
    cycle oil on the center crank, turning the motor over, with the motor “horizontal”
    so both sealing rings should have been good and sealed.

    If it’s the crankshaft sealing rings, I’m guessing I’m “out of business”…..
    I have no other good ideas!

    P.S. – While the motor was apart, I checked, and rodded out the exhaust passage
    in the lower leg, and it seemed okay.

    VIDEO of Failed starting attempts with know good magneto

    https://youtu.be/jkidXxzdjEg

    DSCN9100

    DSCN9103

    DSCN9104

     

    Prepare to be boarded!


    stanley

    US Member - 2 Years
    Replies: 615
    Topics: 114
    #285282

    I have a poorly running KA39 that I periodically take of the rack and fool  with trying to get it to run and then put back on the rack when it frustrates me again.I do think it’s the crank  shaft sealing rings and I think I remember someone saying there is a replacement.When it warms up a bit more I’m going to tear it down and check them out.I feel your pain,you have my sympathy.


    Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 7523
    Topics: 1073
    #285287

    Thanks Stan, It would be interesting to know what the replacement was for the crank sealing
    rings, and how ones tells if they’re “worn out”!

    Prepare to be boarded!

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