after getting my mower back from the B&S Technician for a carb rebuild, I was told that the engine is only working with one cylinder. They said that the cam shaft lobes for the 1st cylinder cycle where worn and not moving the rods enough to engage the intake and exhaust valves. I am trying to figure out if this is true or not, or does this guy just want me to spend move money? Could the lobes get worn down, how could they get worn down or is it something else? Engine sounds like it has from day one, guess I could have bought it broken, bought it used. It does bog down and stall if the grass is wet and to tall, which I try not to do but here in Florida lately it has rained almost everyday for a while now.