2
Look For Relevant Emissions Durability Period and
Air Index Information On Your Engine Emissions Label
Engines that are certified to meet the California Air Resources Board (CARB) Tier 2 Emission Standards must display information regard-
ing the Emissions Durability Period and the Air Index. Briggs & Stratton makes this information available to the consumer on our emission
labels.
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 en-
gine 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
Engine Emissions Compliance Label
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 470000 engines
is 752 cc.
This is a generic representation of the emission
label typically found on a certified engine.
The Power That Works For You.
™
The displacement of Model Series 540000 engines
is 895 cc.
Summary of Contents for 540000 Series
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