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Two and three-wheelers
Motorcycles in the U.S. were regulated by a single set of standards for all model years from 1978-2005.
On January 2004, the Environmental Protection Agency (EPA) established two tiers of exhaust emission standard for highway motorcycles. Tier 1 came into effect in 2006 and remains in effect for motorcycles below 280 cubic centimeters (cm3). In 2010, standards for motorcycles with engines sizes above 280 cm3 motorcycles were updated to Tier 2 standards.
1978-2005 Highway Motorcycle Standards
These standards applied to:
    •1978 and later model years, new gasoline-fueled motorcycles built after December 31, 1977
    •1990 and later model years, new, methanol-fueled motorcycles built after December 31, 1989
    •1997 and later model years, new, natural gas-fueled and liquefied petroleu
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Two and three-wheelers