Briggs & Stratton BRUTE Manual Del Operador página 29

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 Air Index. The engine
manufacturer makes this information available to the
consumer on 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 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.
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.
This engine has a moderate rating with an Air Index of
3. The EPA Emissions compliance period is Category
C. The displacement of this engine is 147.8 cc.
Below is a generic representation of the emission
label typically found on a certified engine.
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