I have a Kohler KT735 (7000 series) on my new (less than fifty hours) Cub Cadet that backfires sometimes when I push the throttle lever down when I am going to shut it down. It does not backfire at any other time, so I doubt (but not sure), that the cause is not one of those listed in the Kohler engine manual (improper fuel, Dirt in fuel line, Engine overloaded, etc.), I checked the air filter, and it is not clogged. I suspect carb set too lean, but want input before dorking with the carb willy-nilly...besides, I don't know where the carb is on the Kohler engine, nor what to turn to adjust.