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Table 4-33: Federal Exhaust Emissions Standards for
Newly Manufactured Motorcyclesa
(g/km)b
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50-169
cc |
1.0-13.8 |
5 |
5 |
5 |
5 |
170-749
cc |
1.0-13.8 |
5
+ 0.0155(D-170)d |
5.0 |
5.0 |
5.0 |
750
cc and greater |
1.0-13.8 |
14 |
5.0 |
5.0 |
5.0 |
50
cc and greater |
11.0-31.0 |
17 |
12 |
12 |
12 |
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50
cc and greater |
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5.0 |
5.0 |
50
cc and greater |
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12 |
12 |
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50
cc and greater |
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5.0 |
50
cc and greater |
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12 |
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50-169
cc |
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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 |
170-279
cc |
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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 |
280
cc and greater |
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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.
SOURCES: 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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