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Federal Exhaust Emissions Standards for Newly Manufactured Motorcycles (g/km)

Dataset Excel: 
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 motocycles built after December 31, 1989, and to 1997 and later model year, new, natural gas-fueled and liquefied petroleum gas-fueled motorcycles built after December 31, 1996, and to 2006 and later model year new motorcycles regardless of fuel.

Description: 

KEY: cc = cubic centimeters; g = gram; HC = hydrocarbon; CO = Carbon Monoxide; kg = kilogram; km = kilometer; lb = pound; mi = miles; mph = miles per hour; NOx = Nitrogen Oxides.

a A motorcycle is any motor vehicle with a headlight, taillight, and stoplight, and having two or three wheels and a curb mass less than or equal to 793 kg (1,749 lb). (The limit was 680 kg, or 1,499 lb prior to the 1998 model year.) A motorcycle is excluded from the standards if it has a displacement of less than 50 cc (3.1 cubic inches) or if with a 80 kg (176 lb) driver it cannot start from a dead stop using only the engine or exceed a speed of 40 km/h (25 mph) on a level, paved surface. 

b Readers who wish to compare motorcycle regulations with passenger car and truck regulations should note that 5.0 g/km = 8.0 g/mi and 12 g/km = 19 g/mi.  

c Estimates of emissions rates prior to controls are ranges of emissions for all engine displacements. Not available for motorcycles powered by fuels other than gasoline. 

d Useful life is expressed in years and kilometers, whichever comes first. 

e Starting with the 2006 model year EPA  (Environmental Protection Agency) 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.

f This is an optional standard that allows manufacturers to average their emissions or transfer emission credits across classes.

g With model year 2006-2009, Class III motorcycles must comply with the EPA Tier 1 Exhaust Emission Standards and shall not exceed the HC + NOx of 1.4 g/km.

h 2010 and later model year, new Class III motorcycles must comply with the EPA Tier 2 Exhaust Emission Standards and shall not exceed the HC + NOx of 0.8 g/km.

Source: 

Emissions prior to controls:

40 CFR 86 Subpart E (July 1, 2000).  U.S. Environmental Protection Agency, Office of Air and Radiation, personal communication, Aug. 28, 2001. 

1978 and later model year: 

United States Environmental Protection Agency, Office of Transportation and Air Quality, EPA-420-B-16-016, Highway Motorcycles: Exhaust Emission Standards, available at https://www.epa.gov/emission-standards-reference-guide/epa-emission-stan... as of Nov. 6, 2019.

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