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Look For Relevant Emission Durability Period and
Air Index Information OnYour Engine Emission Label
Engines that are certified to meet the California Air Resources
Board (CARB) Tier 2 Emission Standards must display informa-
tion regarding the Emissions Durability Period and the Air Index.
Briggs & Stratton makes this information available to the con-
sumer on our emission labels. The engine emission label will in-
dicate certification information.
The Emissions Durability Period describes the number of
hours of actual running time for which the engine is certified to
be emissions compliant, assuming proper maintenance in ac-
cordance with the Operating & Maintenance Instructions. The
following categories are used:
Moderate:
Engine is certified to be emission compliant for 125 hours of ac-
tual engine running time.
Intermediate:
Engine is certified to be emission compliant for 250 hours of ac-
tual engine running time.
Extended:
Engine is certified to be emission compliant for 500 hours of ac-
tual engine running time. For example, a typical walk-behind
lawn mower is used 20 to 25 hours per year. Therefore, the
Emissions Durability Period of an engine with an intermedi-
ate rating would equate to 10 to 12 years.
Certain Briggs & Stratton engines will be certified to meet the
United States Environmental Protection Agency (USEPA)
Phase 2 emission standards. For Phase 2 certified engines, the
Emissions Compliance Period referred to on the Emissions
Compliance label indicates the number of operating hours for
which the engine has been shown to meet Federal emission re-
quirements.
For engines less than 225 cc displacement.
Category C = 125 hours
Category B = 250 hours
Category A = 500 hours
For engines of 225 cc or more displacement.
Category C = 250 hours
Category B = 500 hours
Category A = 1000 hours
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