oEPA
United States
Environmental Protection
Agency
Office of Transportation and Air Quality
              EPA-420-B-16-016
                   March 2016
                            Highway Motorcycles: Exhaust Emission Standards

Federal
Year
1978-2005
2006+
2006-2009
2010+
Class
I
II
III
l-Ab
l-Bb
II
III
(TieM)
III
(Tier 2)
Engine Size
(cc)
50-169
170-279
280+
<50
50-169
170-279
280+
280+
HC
(g/km)
5.0
1.0
1.0
1.0
-
-
HC + NOx
(g/km)
-
-
-
1.4
1.4
1.4
1.4
0.8
CO
(g/km)
12.0
12.0
12.0
12.0
12.0
12.0
Useful Life a
5/12,000
5/18,000
5/30,000
5/6,000
5/12,000
5/18,000
5/30,000
5/30,000
Warranty a
5/12,000
5/18,000
5/30,000
5/6,000
5/12,000
5/18,000
5/30,000
5/30,000
Notes:
General applicability: These standards apply to 1978 and
later model year, new gasoline-fueled motorcycles built after
December 31, 1977, and to 1990 and later model year, new,
methanol-fueled motorcycles built after December 31, 1989,
and to 1997 and later model year, new, natural gas-fueled and
liquefied petroleum gas-fueled motorcycles built after Decem-
ber 31, 1996, and to 2006 and later model year new motor-
cycles regardless of fuel.
a   Useful life and warranty period are expressed in years
    and kilometers, whichever comes first.
b   Starting with the 2006 model year EPA re-defined Class I
    to include motorcycles with engines smaller than 50 cubic
    centimeters. These new previously unregulated vehicles
    are Class I-A, and the pre-existing Class I became Class
    I-B.
                                          c   This is an optional standard that allows manufacturers
                                              to average their emissions or transfer emission credits
                                              across classes.

                                          Code of Federal Regulations (CFR) citations:
                                              40 CFR 86 Subpart F = Motorcycle emission test proce-
                                              dures
                                              40 CFR 86.410-90 = Emission standards for MY 1990-
                                              2005
                                              40 CFR 86.410-2006 = Emission standards for MY
                                              2006+.epa.gov/otaq/standards/light-duty/motorcycle

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