Shifty, you have quoted two of the three blocks of numbers stamped on the air cowl of the Briggs and Stratton engine in your SB mower. If you post the third block of numbers, we can tell you when it was made. If you post a picture of the mower identification plate that should be on the side of the mower, Deejay can tell you what model it is, whether we have a manual available for it, and some other useful information. That plus a few general pictures of the mower will make this thread more useful in our archives.

I've moved this thread to the Scott Bonnar mowers sub-forum. When we've sorted out the model identification and general mower frame issues such as sharpening etc., if you would like to talk about your engine issues, please start a new thread in the Briggs and Stratton Engines sub-forum.