There are videos online Youtube, that show you how to remove the seals with a screw and an electric screwdriver. Works like a charm. You pop them back in using a pipe, or deep socket that you can press on the seal and tap with a hammer lightly to get them seated.
The Lawnboy carb is a very simple device, on late models, there are really no adjustments for fuel mixture, and they are jetted lean, so any obstruction, or leaky gaskets between carb and engine block can lean the mixture out even more, to the point you have poor or no running. You have to actually remove the main jet (under the screen in middle of carb float bowl), and clean it separately to really get it clean. This is a long brass tube and there are several tiny holes in it, that can get closed up due to old gas turning to varnish, and just blowing thru from the bottom with air or carb cleaner will not truly get this clean. The main jet just unscrews, just like the needle seat does, by using a screwdriver in slots on bottom.
The Lawnboy carb is a very simple device, on late models, there are really no adjustments for fuel mixture, and they are jetted lean, so any obstruction, or leaky gaskets between carb and engine block can lean the mixture out even more, to the point you have poor or no running. You have to actually remove the main jet (under the screen in middle of carb float bowl), and clean it separately to really get it clean. This is a long brass tube and there are several tiny holes in it, that can get closed up due to old gas turning to varnish, and just blowing thru from the bottom with air or carb cleaner will not truly get this clean. The main jet just unscrews, just like the needle seat does, by using a screwdriver in slots on bottom.