BS AU 193a:1990

Foreword
Committees responsible
Specification
1. Scope
2. Definitions
3. General
4. Fibrous material
5. Permissible noise level
6. Marking and packaging
Appendices
A. Tests for durability of fibrous material
B. Conditioning of exhaust systems containing fibrous
     material
C. Methods of measuring noise levels
Tables
1. Maximum noise level for motor cycles or mopeds of
     type A
2. Maximum noise level for motor cycles or mopeds of
     type B
3. Maximum noise level for motor cycles or mopeds of
     type C
4. Distances to be completed during conditioning
5. Number of test bench cycles to be completed by each
     class of motor cycle or moped
6. One test bench cycle
Figures
1. Test apparatus for conditioning by pulsation
2. Arrangement of test for measuring motor cycle noise
     level (vehicle in motion)

Requirements for the silencing properties of replacement exhaust systems.

This British Standard specifies requirements for the silencing properties of replacement exhaust systems or parts thereof for installation on motor cycles and mopeds. It describes methods for measuring the noise emitted by motor cycles and mopeds fitted with these systems and specifies requirements for the durability of fibrous noise absorbing materials where these are used to meet the noise limits. It also includes requirements for marking these exhaust systems and their packaging and for the supply of installation literature.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.