125 exhaust noise limits?

[martinshaw94]

hi all

just wondering what the score is on the law for the noise of exhaust and what one is best for my yamaha xt125x as my stock can is a rust bucket and soon will be blowing holes out on it what is the best can to fit that will comply with the uk laws

martin

[DirtyDT]

(d) Exhausts - 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 80cc - 77 dB
Between 80 and 175cc (incl.) - 79 dB
Above 175cc - 82 dB

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)

In reality it just needs not to be marked "not for road use" (or similar) and not too loud. Points and fines apply and an MOT tester can fail it if it is too load.