Emissions Control
EMISSIONS CONTROL
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 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.
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
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.
Portions of this publication are subject to copyright of Briggs & Stratton Corporation. Content on this page has been
reproduced with the written permission of Briggs and Stratton Corporation.
2009-2011 XRT 950 Gasoline Vehicle Owner’s Manual
Page 59
