Husky rider w/20hp Kohler Magnum (1995ish). Spec #57528.
For a long time it ran rough. Surges a lot. Throttles up slowly. Blows black smoke when throttling up. I'm told this is carb problem.
The other day I'm mowing and its running rough and surging. When the rpm's are on the way up it blows black smoke. But after a while it starts to stall out. I shut off mowers and it gradually gains rpm's. Mowers on...dies. Mowers off...slow recovery. I drove back to the house and it died. Wouldn't restart.
Checked spark. None sometimes or very weak. Found that the spark plug wire connector is rusted and starting to crumble. Ah hah! Could the slow deterioration of the connection cause a bad spark which caused the rough running and black smoking? Soooo, I replaced spark plug ends. It started up. Ran rough. Sooo, I took the carb off and tore it apart and soaked it in cleaner. Reassembled. Started immediatelly. Still gains rpm's slowly. Turned mowers on. Engine immediately dies just like if the key is turned off. Turn the mowers off and engine gains back it rpm's.
Any ideas? I'm stumped.