Sounds loike the float is either stuck open or there is dirt in the carb. You might want to take the carb off, remove the float bowl, and inspect the float and needle valve. Spray the carb with carb cleaner, especially where the needle valve seats and all of the passeges inside. I would suggest getting new gaskets because the old ones usually break when they are removed. I hope this helps, Good luck.
SOURCE: craftsman 19.5 lawn tractor w/briggs & stratton keeps flooding
This could be a number or items from no spark to a faulty carburetor, a plugged up air filter, valves out of adjustment, poor gas, faulty spark plug.
First, see if your getting spark, how about taking the wire off a plug(s) and holding it about 1/8" or so away from the plug with some masking tape while you crank the engine. You should be able to see the spark jumping the gap, it helps if it is not too light outside. If you attempt to do this with your hands, you will get a spark jolt, it hurts, so use the tape and remember, the engine could start so proceed with caution.
If you have no spark there, then you ignition or magneto is faulty. This would be unlikely in the broader scope of things. You will likely get spark. Make sure the plug is clean, take it out and inspect. If it is covered in gunk well clean it. It will smell like raw gas but you already know that. Change the plug if in doubt.
Remove and clean and replace the air filter.
If you have spark, and a clean filter it is likely a carburetor problem, Depending on the carb, it could be the choke is faulty or, as per the below.
Depending on what model you have there is a float assembly in the
carburetor that stops the fuel from flooding the carb and air intake.
The gas tank is higher then the carb right, so if you dont have a
mechanism for stopping the fuel from leaking out the hole that goes
into the engine, it will all leak out right, as into the fresh air
intake because its easier than going into the engine. So, there is a
miniature float assembly, sort of like your bathroom toilet float to
stop the water. Well there is a small wedge type needle that seats into
a hole and it is attached to a float. As the gas rises in the bowl, it
pushes up the float, sealing the gas into a chamber, as you use more
gas, the float lowers and more gas goes in. So ,there is dirt jammed
into the float bowl sealing needle, just a little, thats all it takes.
So, shut off the gas somehow, hopefully you have a valve, or squeeze
the rubber line, then undo the float chamber, its one nut on the
bottom. Clean carefully. The needle, little spring and float assembly
are delicate. Also, the needle could be worn from engine vibration, so
it may need a new needle. It would help if you described the engine and
carb though.
I posted that as a solution to another problem, but yours may also be the valves need adjusting. Depending on the amount of hours, say over 200, then the valves timing will likely be off a bit. Check the clearances with a feeler gauge, it is not as difficult as it seems. Check your Owners manual for the clearance at top dead center. TDC is when you take the plug out and watch the piston arrive at the top of the cylinder through the spark plug hole when you are turning the engine over (do this by hand, battery off. Make the adjustments with the valve cover off. Follow the instructions.
Hope some of this helps.
SOURCE: 19 hp bs runs good
Sounds like you will need to clean your carburetor.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor a few times, and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float for the carburetor must be level when you go to reassemble the carburetor.
If the mower/weedeater is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, You will first seat the jet screws and count the number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns they were in/out.
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SOURCE: I have a Craftsman Yard Man 6.5hp push mower with
Have you checked the choke that it is off after you get the engine started,the black smoke is definitely from the choke, if you take the carb off and check that the needle closes when it should,as one can easily do an adjustment by bending the float/tab,rgds
SOURCE: Have a lawnboy 10640 w
Drain the fuel. Remove the bolt that holds the float bowl onto the carburetor body. Clean any sediment and water out of the bowl. Then, clean the bolt. There are holes in the bottom and along the smooth sides. Use no metal objects to clean the bolt. Clean till shiny. Then, reinstall, not forgetting the external washer under head of bolt. Go to auto parts store and get a pint of Chem Tool Berryman B-12 Carburetor cleaner. The recommended dosage is 1 ounce per gallon. Toulene is one of it's active ingredients. Double the recommended mix...to 2 ounces /gallon or 1 ounce in half a gallon. Put this strong mix into the mower and let it run. It WILL clean the carburetor and probably the intake valves as well. This is the convenient way of cleaning your carburetor.
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