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snowblower carb woes

Post in 'DIY and General non-hearth advice' started by Danno77, Nov 16, 2012.

  1. Danno77

    Danno77 Minister of Fire

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    This stupid walbro carb is frustrating me.

    First I mess with the fuel inlet that was loose, it's fine now. I was having a leaking carb that was draining all the fuel out of the tank, so I thought I'd start with a carb rebuild.

    Well, i got it rebuilt and hooked back up and the danged carb is STILL leaking everywhere. EXCEPT when I completely seat the H mixture screw. (probably never needed a rebuild, just needed this fixed)

    I've gotten it to start a few times but now I've lost a little bit that holds a lever onto the carb for throttle purposes. this has a sort of auto throttle deal like a lawnmower to maintain whatever RPMS. So now when I get it to fire it might start throttling itself, but then it pops off and closes the butterfly and the thing dies.

    at this point I'm not sure what to do about the H screw. why would that make the carb drain out like that? The carb is UNDER the motor, BTW, so it just pours out the unfiltered mouth of the carb (remember that many snowthrowers/snowblowers don't have air filters)

    any advice as I proceed?

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  2. Danno77

    Danno77 Minister of Fire

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    ok, i know this is weird, but the leaking problem resolved? I'm not sure if there was something that had to clean itself out or what, but I backed the screw out again just to see if I could get it running (leak and all) and suddenly no leak...

    Never could find that teensy circlip, so stole a twist tie off of the bread for now. Probably will stay that way for the rest of it's life.

    So, the ending to the story is that this little Deere runs well now!
    Pallet Pete likes this.
  3. Gary_602z

    Gary_602z Minister of Fire

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    Dang and now the bread will be stale! Or did you do the man thing and twist it and fold it under the loaf?:)

    Gary
  4. Danno77

    Danno77 Minister of Fire

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    I did the EXTRA manly thing and told my wife to make me a sandwich with the bread before it dries out.

    or, there's the real scenario which is me using the tie off of the bread because it was the first thing I saw, then after I fixed the thing that needed fixing, I came into the house and quietly spent a good ten minutes searching for a replacement tie before my wife found out and I got in trouble.
  5. ScotO

    ScotO Guest

    Not sure what carb you have exactly or what it looks like, but is there supposed to be an O-ring on the setting screws? Sometimes a sticking needle valve can drain all the gas out of a carb real quick, that could have been your problem. Most needle valves have a hard silicone tip on them that, over time, can get indented and won't seat right ...or possibly, if it's a new needle valve, the actuating arm (with the little compression spring) may need tweaked if it doesn't let the needle seat...... Dang needle valves anyway.......

    It may have popped itself loose.
  6. Danno77

    Danno77 Minister of Fire

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    the needle valve was good when I checked it, but the rebuild kit came with one, so I replaced it.

    Anyway, I never took out the setting screws to look at their innards, so I don't know what's in there for them. Maybe I should have, but now that it's working I'm not touching anything on it.
    ScotO likes this.
  7. ScotO

    ScotO Guest

    If it ain't broke, don't fix it......

    Let her run til she quits, then rebuild it again.....that's how I does it...
    Danno77 likes this.
  8. jharkin

    jharkin Minister of Fire

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    The float feed carb on my ariens will sometimes leak like a sieve when I open the fuel shutoff after its been sitting. Problem is the float gets stuck open. Tapping on the float bowl frees it... Leak stopped.

    One of these days I should call them about a replacement.
  9. hilbiliarkiboi

    hilbiliarkiboi Member

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    My stihl 55 did the drainy thangy. Kept putting in a little more gas, then a little more. Also self resolving.
  10. Biglumber

    Biglumber Member

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    Walbro makes an fuel inlet adjustment tool. Look up "Walbro 500-13". Little W shaped dealy that has all of the inlet needle settings needed for most walbro carbs.
    Glad to hear it stopped leaking. If it starts leaking again, try this.

    Peace
  11. jharkin

    jharkin Minister of Fire

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    The w gismo is the pop off pressure adjuster for pumper carbs. Needles adjust via screws.

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