Carb should have a number like this, Kawasaki 15004-7063, but this is only an example as the serial number you posted I can’t find. I need the units serial number. All I know now is you have a Husqvarna Z-turn with a Kawasaki FR691V engine. It was running rough and surging so you decided to throw parts at it. You purchased an aftermarket carb off FleaBay and that didn’t help, plus you didn’t give us the carb part number. The picture you painted is very blurry, so please try clearing it up, plus turn the caps lock OFF