MD-38 carburetor questions

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  • opposedtwin

    US Member - 2 Years
    Replies: 968
    Topics: 259
    #206232

    Are there supposed to be some parts in between where my screw driver is pointing? Looks like there are in the parts catalog but hard to tell. That spring and sleeve may be pressed in there?

    Looks like all there really is to the carb is to clean it up, replace 2 pieces of packing and the gasket on the screw at the bottom of the bowl. Also the carb mounting gasket. Anything else?

    Thanks for any info you can provide.

    Scott

    8C497693-541D-4934-B536-A7DC02C013C6


    Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 7495
    Topics: 1072
    #206241

    If there is something, I don’t see that I had it either.
    I was guessing a tension washer, but don’t see one
    on my parts tray.

    DSCN8831

    Prepare to be boarded!


    opposedtwin

    US Member - 2 Years
    Replies: 968
    Topics: 259
    #206250

    I circled those parts in the upper right of your photo. I think it’s this spring and sleeve that i need. Unless they’re stuck indide? I will check tomorrow.

    A9538A78-A75A-4861-B199-5C1ECC9E9932

    • This reply was modified 3 years, 9 months ago by opposedtwin.
    • This reply was modified 3 years, 9 months ago by opposedtwin.

    opposedtwin

    US Member - 2 Years
    Replies: 968
    Topics: 259
    #206254

    Buc, what did you need for the carb o/h? Just packing pretty much?

    I assume that’s dull aluminum for the paint color? What brand paint did you wind up using?


    billw

    US Member - 2 Years
    Replies: 2071
    Topics: 66
    #206256

    It’s probably been thirty years since I had my MS-39 apart, which is similar; so I don’t remember many details about the inner workings. I do remember that it was pretty hard to get going, even with new-at-the-time rings. I also remember that it would not even fart unless the initial setting on the carb was set at exactly 5/8 of a turn out….

    Long live American manufacturing!


    Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
    Replies: 7495
    Topics: 1072
    #206261

    Scott, I think I only needed new packing on the needle and made a new cork float.
    DupliColor Aluminum is my “go to” paint unless I’m working on a Rembrandt.

    Mine was anemic on compression and I had to use a drill to get it going.
    It seemed to get better after running a few times.

    Prepare to be boarded!


    opposedtwin

    US Member - 2 Years
    Replies: 968
    Topics: 259
    #206325

    Buc,
    Here’s a better picture of the parts in question. How did you get that spring and sleeve out of there? Or were they loose to begin with?

    I wonder if they really need to come out or not.

    Scott

    2D3824C8-AE57-4CBD-B819-A5F8B58A08BC


    opposedtwin

    US Member - 2 Years
    Replies: 968
    Topics: 259
    #206732

    Hey Buc, i tried sending you a pm but i don’t know f it worked. Also i tried to attach a link to this thread but that probably didn’t work either.

    Wondering where that big thin washer goes? Over the barrel valve then into the carb?

    Also notice that brass sleeve and spring look like they may be stuffed into my choke mechanism? They don’t seem to want to come out. Did yours come out easy? What does that spring do? Mine won’t budge.

    ???
    Thanks!
    Scott

    Thanks!
    Scott

    • This reply was modified 3 years, 9 months ago by opposedtwin.

    Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
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    Topics: 1072
    #206757

    Scott, I don’t remember the brass sleeve and spring being stuck, but you could
    remove the choke butterfly and lever, and tap the brass sleeve and spring
    out from the choke end, with the appropriate tool.
    My brass sleeve moves freely inside the bore.
    The “thin” steel washer goes along the right, (towards the front of the motor) of
    the throttle spool assembly. (the part that the control rod from the mag hooks to)
    Sorry for the fuzzy photos.

    DSCN9326

    DSCN9327

    Prepare to be boarded!

    1 user thanked author for this post.

    opposedtwin

    US Member - 2 Years
    Replies: 968
    Topics: 259
    #206777

    Thanks buc. I would rather not remove that choke if I don’t have to. It’s peened in there.

    I don’t understand what that sleeve does. Does anyone know? When yours moves freely, does it go back and forth from the choke housing into the carb body? Due to the diameter, mine doesn’t look like it can move anywhere.

    Tubs or Lloyd, any insight on this is art or its intended function?
    Thanks!
    Scott

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