I have a lawn-boy self propelled mower,model no. 10247-8900001 & up.When i start it it is like a fog machine and it is like the choke is on all the time.I don;t see any adjustments for this.When it sits over night raw gas comes out of the exhaust.

You have some debris in the float needle valve. It will require that you remove the float bowl and the float. To remove the float you will need to remove the float pin and drop the float straight down. The float needle will come out with the float assy. Then take some carb cleaner or compressed air and shoot into the float needle chamber to clear the debris.
Check the float needle tip for any rough spots. It should be smooth. The reinstall the float needle and float assy making sure to note the float pin position is the same as originally installed.
Last check before installing the float bowl. With gas available to the carb lift the float GENTLY to the level position. Fuel flow should stop. If it does not stop then there is still a problem with the float needle or the needle seat is damaged and will have to be replaced. The needle and seat are in the same package if you purchase a replacement. The seat can be difficult to get out of the tiny hole. A really hard piece of wire with a mini 90 bend on the end will often do the trick.

If for any reason you have to remove the carb.. do yourself a favor and take PICTURES of the linkages and spring(s) so that you can re-install them correctly.

If you need more assistance please pass me just the ENGINE number so I can pass you the diagrams with part numbers if necessary.

Thanks for choosing FixYa.

Kelly