Small Engines (Lawn Mowers, etc.): Flooding 10hp Briggs and Stratton, carburetor body, briggs and stratton

Question
Hello, John.
I have a DeVilbiss generator model GB5010-1 with a Briggs and Stratton 10 hp engine.  
Engine Model: 19E412
Type: 1131-E1
Code: 9910191A
It will not run smoothly and surges/cuts out, this is causing erratic/low voltage at the generator.  It will smooth out and run fairly well if I close off the fuel supply valve at the tank until it begins to run out of fuel and then it dies.  I think that it is flooding out or getting too much fuel.  But, the only thing I can see to do is to replace the fuel inlet needle and seat and/or the float itself.  Is there something else (like a mixture screw) that I am missing here?  I have the illustrated parts list for this engine from B&S, but I can't find any mixture adjustment info there.  I have had the bowl off of the carb and the float seems to be ok with nothing sloshing around inside of it and I tried to clean the carb with carb cleaner with the carb still on the engine (how do you remove the studs with the splined looking ends?) without any improvement.  I tried to concentrate the spray cleaner into the seat area with the needle out of there to eliminate any dirt/gunk in there.  Is there anything else to try before I just get a new carb for it?  Thanks for the info and for your time.


Answer
Hello Phillip:

The Bolts/Studs Require a Torx Socket (Female Socket Not Male Socket). Depending on the Bolt/Stud Size; Sometimes a 12 Point Regular Socket will Fit and Remove the Bolts/Studs. As for the Running Problem;  Remove, Disassemble and Soak the Carburetor Overnight in Carburetor Cleaner (I Use Gunk). I have Found that Most People can Use a Breakdown/IPL and Disassemble the Carburetor Enough for Proper Cleaning. You Only have to Remove the Bowl, Float Pin, Float and Needle Valve and Any Adjustment Screws that Go Into the Carburetor Body. The Welch Plugs Do Not have to be Removed. Then Soak the Carburetor Body and Parts in a 1 Gallon Can of Gunk Carburetor Cleaner Overnight. The Can has a Parts Tray Inside it for the Small Parts. Once the Carburetor and Parts are in the Cleaner, you can Replace the Lid for Safety and to Prevent Accidental Spillage. Then Blow Out the Passages with Compressed Air. Install New Parts if Required. ****All the Carburetor Adjustments are the Same for Lawn Mower and Trimmers. There are Several Location for the Air Mixture Screws. The Idle Air Mixture Screws are Usually Located at the Top of the Carburetor Bowl and the Top of the Carburetor Body. If the Main Air and Idle Air Mixture Screws are Side by Side on the Side of the Carburetor, then the Idle Air is the Farthest from the Engine. The Main Jet Air Mixture Screw is Located in the Bottom of the Carburetor Bowl or Beside the Idle Air Screw on the Side of the Carburetor Body. Some of the Older Model Carburetors have the Main Jet Mixture Screw Straight in from the Top of the Carburetor Body (this is Rare anymore). If you have Cleaned the Carburetor (Disassembled and Soaked Overnight in Carburetor Cleaner (I Use Gunk). Then Blow Out the Passages with Compressed Air and Install a New Kit if Required. Now Setting the Air Mixture Screws:  ****Turn the Idle Air and ****Main Air Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Holding the Throttle Full Open, Start the Engine. Turn the Main Air Mixture Screw Clockwise Until Proper Revs are Obtained. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs. Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required. Now Set the Idle Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.**** You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.smallenginepartswarehouse.com/parts.asp and Select the Shop Online Parts Look Up. Then Select the Model Tab. Then Select the OEM and Enter the Model and Type Numbers. Then Double Click on the Model in the Results Area. Now you can Select the Section of the Engine you Wish to View. This Carburetor May have a Float Needle and O-Ring Seat or the Float Needle with a Black Rubber Tip and No O-Ring Seat. If the Float Needle is All Metal, then there is a Flat O-Ring Seat in the Inlet Port that the Needle Seats Against. If the Float Needle is the Long Needle with the Black Tip, there is No O-Ring Seat and the Float Needle Seats Against the Carbuburetor Housing. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 9pm EST (US). My New Day Starts then. Thanks.

Respectfully

John