Carb question on my riding mower. Discussion in 'The Garage' started by SAWYER, Jun 14, 2012. Page 1 of 2 1 2 Next >. I have a Craftsman riding mower and yesterday it stopped running. It is getting fire and the plug is working so I took the carb off a when I spray starting fluid in the intake it fires right up. On the bottom of the bowl of my carb is a little square piece with a pointed end that screws in the bottom and at the bottom of that piece two wires in a plug hooks up to it.