on motorcycles first used on or after 1 January 1985 the silencer which forms part of the exhaust system must be either:
(i) that with which the machine was first fitted; or
(ii) clearly and indelibly marked with :-
-the relevant BS marking BS AU 193/T2, BS AU 193a, 1990/T2, BS AU 193a, 1990/T3; or
-the relevant "e" marking to show compliance with EC Directive 89/235; or the relevant "e" marking to show compliance with Chapter 9 of EC Directive 97/24; or
-the name or trade mark of the manufacturer or marked with that manufacturer's part number - relating to it.
The European Community noise limits applicable to new motorcycles first used from 1 April 1991 are:
Motorcycle Category by cm3: Limits in dB(A)
Up to and including 80: 77
Between 80 and 175 (incl.): 79
Above 175: 82
Motorcycles approved to EU Directive 97/24/EC, Chapter 9 will be 2dB(A) less than the above figures.
(Note: the precise regulations for motorcycle exhausts are complex and it is recommended that they are studied closely to obtain accurate and complete details of the requirements).
Before buying any replacement parts for systems listed in this section, riders should check for the relevant marks, where applicable. These will include an "e" mark for EC Directives, an "E" mark for ECE Regulations and "BS" for British Standards.
(Note: amateur motorcycle builders may be exempt from some or all of the requirements)
. Think I removed it when I actually got the exhaust fitted, and only search for it once a year for MOT purposes.
