OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Question On Scott Bonnar Cylinder Mowers Almost thrown away

That Briggs engine was made on 18 July, 1974. The mower may have been made about 6 months later, but this could vary according to how many mowers were being sold and how many engines SB held in stock. Here is the Illustrated Parts List for the engine:
http://bsintek.basco.com/BriggsDocumentDisplay/Z6jmvGVJ1DajI.pdf

Here is the Operator's Manual:
http://bsintek.basco.com/BriggsDocumentDisplay/lrvvA-wU7eL7hAxB91ObQ.pdf

I'll leave the remaining points to Deejay.