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Carburetor Fuel Issue, To Rich fuel load, Black Smoke. I have a John Deere riding lawn mower LA 115, 3 years old. Briggs and Strattion 19.5 hp, Model #31P677, Qode type # 0132 B1070531ZD, Nikki carb. with #'s 792345,G02802 and 6131C on it. Replaced with new - Key switch, Starter solenoid, Carburetor rebuild kit / all O rings, needle & float. Soaked / Cleaned Carb. Blew out all points with air pressure (jet, too). Did Not remove jet. Clear jet and vents. Float works correctly. Throttle and choke connections, settings correct. STILL SMOKING, just a little better than what it was. Research said, might be exaust valve seat or build up. Removed valves, cleaned, polished head, valves and seats. Valves lashed to .004. Note, exaust valve was very loose at disassembly. Everything looks very good with no obvious problems. New spark plug and compression is right on specks. I don't now what else I can do. I can hold the engine throttling bar (don't know what its name is, sorry) from automaticaly jumping back and forth and it will run great for a minute. I can also crimp the fuel line off and shortly after that it will run great for about 20 seconds. Sorry for so long but, I need you to know what I have done in detail. If anyone can help it would be greatly appreciated. Thank You, Shawn

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Posted on Jan 02, 2017

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SOURCE: Briggs Flo Jet carb floods and puts gas into the crankcase

This is a common problem. The needle and seat are prone to being held open from debris, old fuel (these days it only takes a month for fuel to start to go bad) and poor mower design. The weight of the fuel from the tank can be enough to overpower the float system with just the slightest "gumming" of the needle seat. Also, if it's equipped with an electrically powered valve on the bottom of the float bowl, this unit can outright fail, get gummed up a bit, or the electrical system have a problem and power is getting to this unit while switched off, leaving it open thus passing fuel. Most likely, replacing the needle and seat, giving the carb a good cleaning will solve your problem, however if there is damage to the seat from age or debris, just install a 2 dollar in line shut off valve available at most retailers. Then just turn the fuel on and off manually. Cheap fix. 2. Drain the oil from the engine, refill with new oil and just a oz. of atf (automatic trans fluid). Crank the engine with plug wire disconnected for 30 sec or so, then connect the plug wire. Start the engine, but only let it run near idle for a minute or so. Drain again, letting the crankcase "air out" with all plugs\dipstick removed. Remaining fuel will evaporate. Refill and your off and cutting......The ATF is a detergent of a type and will help to collect the fuel from the surfaces inside the engine. It's important to note the fuel will have washed any lubrication properties from the oil, and damage to the journals and other surfaces can happen if the engine is run too long. Usually following the above procedure will limit damage and the engine should be good for many more seasons. Good luck! Papa

Posted on Nov 15, 2008

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