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Table 4-33: Federal Exhaust Emissions Standards for Newly Manufactured Motorcyclesa
(g/km)b
Excel | CSV
Gasoline-powered |
|
|
|
|
|
|
HC |
50-169 cc |
1.0-13.8 |
5 |
5 |
5 |
5 |
HC |
170-749 cc |
1.0-13.8 |
5 + 0.0155(D-170)d |
5.0 |
5.0 |
5.0 |
HC |
750 cc and greater |
1.0-13.8 |
14 |
5.0 |
5.0 |
5.0 |
CO |
50 cc and greater |
11.0-31.0 |
17 |
12 |
12 |
12 |
Methanol-powered |
|
|
|
|
|
|
Total HC equivalent |
50 cc and greater |
|
|
|
5.0 |
5.0 |
CO |
50 cc and greater |
|
|
|
12 |
12 |
Natural gas and LPG-powered |
|
|
|
|
|
|
HC |
50 cc and greater |
|
|
|
|
5.0 |
CO |
50 cc and greater |
|
|
|
|
12 |
Useful life (Class I) |
50-169 cc |
|
5 years or 12,000 km (7,456 mi), whichever comes first |
5 years or 12,000 km (7,456 mi), whichever comes first |
5 years or 12,000 km (7,456 mi), whichever comes first |
5 years or 12,000 km (7,456 mi), whichever comes first |
Useful life (Class II) |
170-279 cc |
|
5 years or 18,000 km (11,185 mi), whichever comes first |
5 years or 18,000 km (11,185 mi), whichever comes first |
5 years or 18,000 km (11,185 mi), whichever comes first |
5 years or 18,000 km (11,185 mi), whichever comes first |
Useful life (Class III) |
280 cc and greater |
|
5 years or 30,000 km (18,641 mi), whichever comes first |
5 years or 30,000 km (18,641 mi), whichever comes first |
5 years or 30,000 km (18,641 mi), whichever comes first |
5 years or 30,000 km (18,641 mi), whichever comes first |
KEY: cc = cubic centimeters; D = engine displacement; g = gram; HC =
hydrocarbon; h = hour; kg = kilogram; km = kilometer; lb = pound; LPG = liquefied
petroleum gas; mi = miles; mph = miles per hour.
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. The formula for 1978-79 HC emissions by motorcycles 170-749 cc becomes,
in g/mi., approximately 8.0 + 0.025(D-170).
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 D = engine displacement in cubic centimeters (cc). For example,
the standard for a 300 cc engine would be 5.0 + 0.0155(300-170) = 7.0 g/km.
SOURCE:
40 CFR 86 Subpart E (July 1, 2000). U.S. Environmental Protection Agency, Office
of Air and Radiation, personal communication, Aug. 28, 2001.
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