Working on a Briggs and Stratton 10T502-1457-B1. Runs rough and has black smoke coming from exhaust. This engine has no float to stick so that is not the problem. It does have a fuel primer bulb that works good. I have done all the usual things...cleaned air filter, put in fresh gas, installed a new appropriate spark plug, ensured valve/tappet clearance is correct, cleaned carburetor, tank, and screens, cleaned magnets on flywheel and magneto and checked air gap. It is obviously getting too much fuel. Why and how can it be corrected?

Most common reason is a sticking float or fuel inlet valve.

If the plugs are ok and your engine is not smoking after starting and running ..Sounds like either of three things..all with the carburetor .First the carb has a adjustment screw for air/gas mixture on the side if the carb where it attaches to the engine..try this start the engine and at about half throttle..now adjust the screw clockwise until the engine starts to miss and bogg down then back the other way until it starts missing and bogging again. Then slowly adjust back and forth until you hear the engine run the smoothest..give it more throttle if it starts to run rough do the same procedure until you get the results you want..if it is the mixture problem this will take care of it..if this doesn't it it may be your fuel jet in the bowl dirty or the blow float sticking..if you are not familiar with carbs best to have a professional look at it..you can drop the bowl by removing the bottom bowl and clean it out...check to see if the float easly moves up and down..replace the bowl and go from there..worse scenario new or rebuilt carb...good luck..

Is the carb flooding?is there black smoke coming from exhaust when running, if so it could be the carb over filling with fuel. Is there petrol leaking out of the carb? If not check the fuel pipe is in good condition

Hi Travis

to much fuel either the needle valve is stuck or the float is bad tear apart the carb acid dip and clean take float submerge in gas for 20 min pull out shake next to ear if you hear liquid inside its bad

Check your oil.

If it is overfilled, milky, or smells like gas. Your going to need to change that ASAP. It sounds like the float has stuck in the past or is still sticking, and it has flooded the crankcase with gas, which has mixed with the oil. And because it is overfilled it comes through the breather hose into the carb. This also explains the smoke most probably because the oil is spewing in the carb through the breather and being burned.

Hi, check the engine oil level. It will be most likely over full as it has become contaminated with fuel, if so you will be able to smell fuel on the dipstick. If thus is the

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

possible check vacume hoses if its hookup properlly

either the choke is closed or the float is stuck open..if the float is stuck open, normally it will leak gas