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Look For Relevant Emissions Durability Period and Air Index Informa-
Engines that are certified to meet the California Air Resources Board (CARB) Tier 2 Emission Standards must
display information regarding the Emissions Durability Period and the Air Index. Briggs & Stratton makes this
information available to the consumer on our emission labels. The engine emission label will indicate 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 accordance with the Operating &
Maintenance Instructions. The following categories are used:
Moderate:
Engine is certified to be emission compliant for 125 hours of actual engine running time.
Intermediate:
Engine is certified to be emission compliant for 250 hours of actual engine running time.
Extended:
Engine is certified to be emission compliant for 500 hours of actual 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 intermediate rating would equate to 10 to 12 years.
The Air Index is a calculated number describing the relative level of emissions for a specific engine family. The
lower the Air Index, the cleaner the engine. This information is displayed in graphical form on the emissions
label.
After July 1, 2000, Look For Emissions Compliance Period On
After July 1, 2000 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 requirements. For engines less than 225 cc
displacement, Category C = 125 hours, B = 250 hours and A = 500 hours. For engines of 225 cc or more,
Category C = 250 hours, B = 500 hours and A = 1000 hours.
The displacement of Model Series 420000 engines is 694 cc. The displacement of Model Series 460000 engines
is 745 cc.
This is a generic representation
of the emission label typically
found on a certified engine.
The Power That Works For You.
tion On Your Engine Emissions Label
Engine Emissions Compliance Label
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