Echo PB-2520 Operator's Manual page 13

PB-2520 EMISSION CONTROL
An Emission Control Label is
located on the engine. (This is an
EXAMPLE ONLY, information on
label varies by engine FAMILY).
Product Emission Durability
(Emission Compliance Period)
The 50 or 300 hour emission
compliance period is the time span selected by the manufacturer certifying
the engine emissions output meets applicable emissions regulations,
provided that approved maintenance procedures are followed as listed in
the Maintenance Section of this manual.
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