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Frequently Asked Questions

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Determining Engine Age

What is the age of my engine? How old is my engine? When was it made?

The Code number on the engine indicates the exact date it was manufactured. This system provides an easy way to determine the manufacture date of your engine.

The following is an example of interpreting date Code 99011556:

  • The first two digits (99) denote the year of manufacture. In this case it is 1999.
  • The next two digits (01) are the month of the year, which is January.
  • The following two digits (15) are the day of the month. In this case the 15th.
  • The final two digits designate the plant and assembly line.

Therefore, this engine was produced on January 15, 1999.

Please visit our Numerical Designation System page for more information regarding our engine identification numbers.

Unfortunately, the above does not apply to our older engines, as this tracking system was not implemented until 1965. A great source of antique Briggs & Stratton information can be found through the Web sites below. The websites listed below are provided only as possible resources for obsolete/antique information and are not directly affiliated with Briggs & Stratton.



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    STAMPED - YYMMDDxx Identifies Manufacture date


  • 5HP=5, 18-1/2=18.5, 25=25.00


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