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  1. #11

    1,000 Post Club

    Join Date
    May 2010
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    2,424
    Location
    Illinois
    Mower
    kioti/rhino finish mower

    Re: Briggs and Stratton 18 hp Twin II Flooding out

    I was assuming that after the carb repair you installed the air cleaner base plate to the carb. If it is doing the flooding without the air cleaner base plate attached to the carb, then I would look at either the gasket between the two halves of the carb, or the needle valve isn't sealing. also make sure that the float isn't full of gas.
    ILLINOIS ENGINE, BEECHER CITY, IL
    BRIGGS AND STRATTON MST (MASTER SERVICE TECHNICIAN)
    Sales and Service for Dolmar, Poulan, Briggs and Stratton, Kohler, Lauson(Tecumseh, LCT), Generac, Brute.
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  3. #12

    Join Date
    Aug 2012
    Posts
    822
    Location
    California
    Mower
    TMW REPAIR & THE MUSICIANS WORKSHOP RECORDING STUDIO

    Re: Briggs and Stratton 18 hp Twin II Flooding out

    Quote Originally Posted by ILENGINE View Post
    also make sure that the float isn't full of gas.
    Good point! This has thrown me more times than I can remember

  4. #13

    Join Date
    May 2013
    Posts
    4
    Location
    Georgia
    Mower
    weed eater 18.5 hp

    Re: Briggs and Stratton 18 hp Twin II Flooding out

    Quote Originally Posted by ILENGINE View Post
    I was assuming that after the carb repair you installed the air cleaner base plate to the carb. If it is doing the flooding without the air cleaner base plate attached to the carb, then I would look at either the gasket between the two halves of the carb, or the needle valve isn't sealing. also make sure that the float isn't full of gas.
    I changed gasket between top and bottom of carb and checked float and no gas in it. I changed fuel pump diaphram and gaskets. Drained oil as crank case was full of gas. iIm getting fuel threw hole on top of carb. Looking at engine from front its on choke cable side? I checked needle valve and no groves or damage. I watched video on u tube which is great on how to rebuild this carb and followed instructions and still can't get it to run. I really feel stupid. Thanks for any help. Jim S P.S. I used to live in Mokena and eat at that great steak house on the corner at the center of town.

  5. #14

    Join Date
    Mar 2012
    Posts
    5,221
    Location
    Wisconsin
    Mower
    Toro

    Re: Briggs and Stratton 18 hp Twin II Flooding out

    I'm confused after rereading this entire thread. You say that the model number is 42A707. When I look that engine up it should have a brass float that is adjustable. When you took the carb apart for cleaning, did you replace the float needle and seat? The float needle may look good, but more times than I care to count looks can be very decieving. I would replace the needle and seat with this kit #394682. I have included a service manual for your engine which may help you.

    http://dl.dropboxusercontent.com/u/1...inderLHead.pdf
    This is only my opinion, and many will say it ain't worth a darn, as I'm only a retired grease monkey instructor and not a professional mechanic. Use what I post at your own risk as you know teachers only know book knowledge.

  6. #15
    Has your needle valve been jammed open.

  7. #16

    Join Date
    Jun 2011
    Posts
    428
    Location
    Knoxville, TN
    Mower
    Eager

    Re: Briggs and Stratton 18 hp Twin II Flooding out

    I know how "Misery Loves Company" and I'll chime in with a similar problem with a 17.5 Single Cylinder Kohler on a Craftsman rider that would do the same thing. Last week I wound up putting a fuel line shut off valve on it so the owner could keep it from flooding out after it sat for a while. I checked the float and needle operation and worked fine, but let it sit overnight or a few days and it would flood the cylinder as well as above the bowl, into the carburetor throat, and up into the filter. I could see a puddle of fuel with the air filter off! I drained a teacup of gas when I removed the carburetor bowl. About that much blown out of the cylinder when I took the soaked plug out! Also blew out about a 1/4 teacup of gas out of the muffler! Now it decided to go to the extreme opposite and not get any fuel at all once the shut off valve was turned on! We'll have to put a carburetor kit in it as it just won't cooperate and hope for the best. It too has a plastic "Non-Adjustable" float. Doesn't give a guy any room to adjust anything out. These non-adjustable plastic floats are aggravating when a little adjustment on the float level would clear things up. Looks like you have a "Problem Child Mower" on your hands!

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