OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Question On Scott Bonnar Cylinder Mowers SB 45 age

Hi guys, is there a way to determine the age of my mower with a Kirby engine?

Hello Oakie,

Dating is problematic on 45s, because no factory records survive that
might have assisted. Unlike Briggs, the Kirbys have no known dating
system (based on model and serial).

However, we can get close. You have a 17".
1968 - 1972 (approx) Kirby with single rail
1972- 1976 (approx) Kirby with twin rail

After this, SB went to an all Briggs range, perhaps because Kirby
had ceased production of these engines.

Hope this helps.
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Jack