I have a Craftsman zero turn mower, Kohler 7000 Series, 24hp, 725 cc engine.
My problem is...the engine bogs down, sputters some, and backfires when I have the blades engaged. If I sit idly with the blades engaged it does seem to run alright, but when I start moving it slows down like the engine doesn't have the power to run the deck. When disengaging and then re-engaging the blade is backfires. I do use this mower quite a bit, but I keep it maintained. I recently had to replace the carburetor because it was taking carb spray in the air intake to get it to start.
so I have:
a new carburetor
new spark plugs
new battery
recent oil change
new oil filter, and
new air filter
and also emptied the gas tank to see if there was much gunk and trash in it (there wasn't)
Any ideas?