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Briggs Quantum Carb Problem

Discussion in 'Mechanic and Repair' started by Saxman, Nov 6, 2005.

  1. Saxman

    Saxman LawnSite Member
    Messages: 52

    I have a 5HP Quantum, the engine had not been run in quite awhile. I took the carb off and it had lots of nasty stuff in it and the needle valve was stuck. I got a carb kit and cleaned the carb up inside and out and installed a new needle and seat. The engine runs good now but the carb runs over when the engine is shut off. I presume the float is not set correctly. How do you set the float on this carb? The float is plastic so I don't see how you can bend the part that touches the needle valve. Oh I forgot to say that I checked the float and it "floats".
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    There is no adjustment on the plastic float, But I have taken a contractors heat gun and warmed the float hanger area and bent it a little with pliers and cooled it in water while holding it in that position.
     
  3. Saxman

    Saxman LawnSite Member
    Messages: 52

    Thanks for the information. Is there any trick to these carbs? Ever have run over like this? I never had this problem with a carb before
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Not really any tricks, Either it works or it doesn't, Only had maybe 2 do this and the heat gun deal took care of it. I don't even fool with them anymore if they are gummed up, By the time I get a kit and add labor to rebuild it a new one can be bought and have no hassles.
     
  5. newz7151

    newz7151 LawnSite Silver Member
    from Tejas
    Messages: 2,419

    What does that kitting and labor thing usually run? I guess you have a shop, so I would be asking about at your shop.
     
  6. Saxman

    Saxman LawnSite Member
    Messages: 52

    where can I get a new carb, that sounds like the way I want to go?
     
  7. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    I don't own a shop but I've been working for the same shop for 14 1/2 years.
    We have a $50.00 a hour labor rate. There is a flat rate of one hour to remove a carb. clean and install the rebuild kit reinstall on the unit and test run. It can be higher if for instance if the carb. has a integrated fuel pump or the intake must be removed to remove the carb. as on a Briggs Vanguard.
    This carb. in question I would guess the kit at $8 to $15 and $50 labor, Some small push mower carbs. start at $35.00 and go up to $70.00.
    The main reason I rather install a new one instead of rebuilding a old gummed up one is; A few I did do still had a passage inside I couldn't get to open up and after spending the time and kit price still didn't run right and the kit and time was lost when a new one had to be installed.
    I have a good one in the shop right now, It's a Wisconsin Robin on a Gen-Set been sitting 6yrs. totally gummed up. The kit for that one is $78 and change and the mount and air filter gaskets are separate at another $8 and change, Add $50.00 labor thats around $138.00 a new carb. is $160.00..... 138.00 is way too much to eat so if the customer wants me to repair his unit he gets a new carb.
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

  9. Saxman

    Saxman LawnSite Member
    Messages: 52

    10-4 thanks Rob, sounds like a good idea. New carb on the way
     

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