OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Question On Scott Bonnar Cylinder Mowers Scott Bonnar Original Engine - Rebuild or Replace?

You referred to the engine flooding, which seems impossible unless it has a gravity-feed fuel system. However you also referred to oil running out of the carburetor and over the top of the fuel tank, which would imply that it has a Briggs & Stratton vacuum carburetor, not gravity feed. (Gravity feed engines have the fuel tank above the carburetor, while B&S vacuum carburetor engines have the fuel tank below the carburetor.) Can you tell us what kind of fuel system it has, or post a picture of the engine please? And can you also have another look for the B&S engine model number? It would be on the air cowl - the piece of pressed tin that extends over the cylinder head and down around the flywheel. The number would be above the carburetor/muffler area, and is stamped onto the tin (air cowl), 19 digits long.

We need to clear up those points so I can interpret what you have told us.