I have a 3 year old cub cadet with a 19 horse kohler engine 42 inch cut.After I mowed last year it started to backfire every time I should it down after about 5 seconds.I'm tired of throwing my underwear out.This year I lowered the idle and adjusted the mixture screw or what I think is the mixture screw.There are two adjustment screws side by side,one with a black cap and one you adjust with a screwdriver.It still backfires:HELP PLEASE
