[Code of Federal Regulations]
[Title 40, Volume 21]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR205.166]

[Page 140-141]

TITLE 40–PROTECTION OF ENVIRONMENT

CHAPTER I–ENVIRONMENTAL PROTECTION
AGENCY (CONTINUED)

PART 205–TRANSPORTATION EQUIPMENT NOISE EMISSION CONTROLS–Table of Contents

Subpart E–Motorcycle Exhaust Systems

Sec. 205.166  Noise emission standards.

(a) Noise emission standards. (1) Exhaust systems and exhaust system
components that are designed and marketed for use on any Federally
regulated street motorcycle of the following and subsequent model years
must be designed and built so that when installed on any such motorcycle
which is in compliance with the requirements of subpart D of this part,
they will not cause that motorcycle to produce noise emissions in excess
of the levels indicated:
(i) Systems designed and marketed for use on street motorcycles
other than those that meet the definition of Sec. 205.151(a)(2)(ii):

————————————————————————
A-weighted
Motorcycle model year                        noise
level (dB)
————————————————————————
(A) 1983…………………………………………….          83
(B) 1986…………………………………………….          80
————————————————————————

(ii) Systems designed and marketed for street motorcycles that meet
the definition of Sec. 205.151(a)(2)(ii) (moped-type street
motorcycles):

————————————————————————
A-weighted
Motorcycle model year                        noise
level (dB)
————————————————————————
(A) 1983…………………………………………….          70
————————————————————————

(2) Exhaust systems and exhaust system components that are designed
and marketed for use on any Federally regulated off-road motorcycle of
the following and subsequent model years must be designed and built so
that, at the time of sale, when installed on any such motorcycle which
is in compliance with the requirements of subpart D of this part, they
will not cause that motorcycle to produce noise emissions in excess of
the levels indicated:
(i) Systems designed and marketed for use on off-road motorcycles
with engine displacements of 170 cc and lower:

[[Page 141]]

————————————————————————
A-weighted
Motorcycle model year                        noise
level (dB)
————————————————————————
(A) 1983…………………………………………….          83
(B) 1986…………………………………………….          80
————————————————————————

(ii) Systems designed and marketed for use on off-road motorcycles
with engine displacements greater than 170 cc:

————————————————————————
A-weighted
Motorcycle model year                        noise
level (dB)
————————————————————————
(A) 1983…………………………………………….          86
(B) 1986…………………………………………….          82
————————————————————————

(3) Exhaust systems and exhaust system components that are designed
and marketed for use on any Federally regulated street motorcycle shall
be designed and built so that, when installed on any such motorcycle
which is in compliance with the requirements of subpart D of this part,
and when both the motorcycle and the exhaust system are properly
maintained and used, they will not cause that motorcycle to produce
noise emissions in excess of the levels specified in paragraph (a)(1) of
this section, for an Acoustical Assurance Period of one year or a
distance of 6000 km (3729 mi) after the time of sale to the ultimate
purchaser, whichever occurs first.
(4) Exhaust systems and exhaust system components that are designed
and marketed for use on any Federally regulated off-road motorcycle must
be designed and built so that, when installed on any such motorcycle
which is in compliance with the requirements of subpart D of this part,
and when both the motorcycle and the exhaust system are properly
maintained and used, they will not cause that motorcycle to produce
noise emissions in excess of the levels specified in paragraph (a)(2) of
this section, for an Acoustical Assurance Period of one year or a
distance of 3000 km (1865 mi) after the time of sale to the ultimate
purchaser, whichever occurs first.
(5) At the time of sale to the ultimate purchaser all products must
comply with the standards set forth in paragraphs (a) (1) and (2) of
this section.
(b) Measurement procedure. (1)(i) The standards set forth in
paragraph (a) of this section refer to the noise emissions as measured
in accordance with the measurement methodology specified in appendix I-1
for all motorcycles except those street motorcycles meeting the
definition of Sec. 205.151(a)(2)(ii). Exhaust systems which alter a
motorcycle’s maximum rated RPM shall be tested using the unmodified
motorcycle’s maximum rated RPM to determine closing RPM or test RPM.
(ii) The standards set forth in paragraph (a) of this section for
street motorcycles meeting the definition of Sec. 205.151(a)(2)(ii)
(moped-type street motorcycles) refer to noise emissions measured in
accordance with the measurement methodology specified in appendix I-2.
(2) Exhaust system components sold as separate products shall be
tested as part of a system made up of that part and original equipment
components to complete the system.
(3) Exhaust system components sold as separate products which are
incompatible with original equipment components necessary to make a
complete exhaust system, or which would not meet standards as prescribed
in this subpart in such configuration, may be tested with non-original
equipment components provided that the provisions of
Sec. 205.169(e)(1)(ii)(B) are carried out.