This revised proposal of UN R9 from the IMMA contains the assimilation of the original regulations and their amendments and updates to take into consideration the revision of the test methods in UN R41.

This revised proposal of UN R63 from the IMMA contains the assimilation of the original regulations and their amendments and updates to take into consideration the revision of the test methods in UN R41.

Comments from the IMMA in response to the Russian proposal to re-define the use of terms “sound” and “noise” in the motorcycle noise regulation.

The proposal corrects the typing error of the decibel unit dB(A) (corrected from db(A)) and deletes the unnecessary unit. In Annex 4, revises the current list as an itemized list for greater clarity.

Proposal to clarify the transition provisions to permit the granting of certificates to the previous series of amendments through December 2013 rather than up to the date of the entry into force of the 04 series of amendments.

[Document reissued on August 21, 2013 for technical reasons.]

Proposal to clarify certain terms and symbols used in Annex 7 (ASEP) of the regulation.

This proposal would correct the reference to the latest version of ISO 10844 and introduce transitional provisions for shift of the test track from ISO 10844:1994 to ISO 10844:2011.

Under the current 04 series of amendments to UN Regulation No. 41, the engine speed should be measured during all tests in Annex 3 and Annex 7 (Additional sound emission provisions – ASEP). However, IMMA has found that there is very little difference between the measured and the calculated engine speed for a manual transmission (MT) vehicle (Annex, figure 1) and no impact on the test result (Annex, figure 2). Therefore, this proposal would introduce a calculated engine speed for MT vehicles and for continuously variable transmission (CVT)/automatic transmission (AT) with locked gear mechanism into UN Regulation No. 41.

The purpose of this proposal is to update the reference to the latest version of the ISO 10844 and to introduce transitional provisions for the shift of the test track requirements from ISO 10844: 1994 to ISO 10844: 2014.

Correction to the text of the proposed amendment to introduce a calculated engine speed for manual transmission vehicles and for continuously variable transmission (CVT)/automatic transmission (AT) with locked gear mechanism into UN Regulation No. 41.

The purpose of this proposal is to update the reference to the latest version of the ISO 10844 and to introduce transitional provisions for the shift of the test track requirements from ISO 10844: 1994 to ISO 10844: 2014. This proposal supersedes document GRB/2015/5.

In response to concerns that approval agencies may not grant manufacturers the additional 1dB for L(wot) on conformity of production tests as changes had been made to Annex 6 of R41-04, GRB issued an interpretation recorded in the report of its 56th session. However, IMMA believes that industry and agency personnel may still not be aware of the interpretation. Therefore, IMMA proposes to codify the interpretation within UN R41.

In response to concerns that approval agencies may not grant manufacturers the additional 1dB for L(wot) on conformity of production tests as changes had been made to Annex 6 of R41-04, GRB issued an interpretation recorded in the report of its 56th session. The proposal formalizes the interpretation as an explicit provision of the regulation.

Correction of two minor reference errors contained in the proposal for Supplement 2 to the 04 series of amendments to Regulation No. 41 which was adopted during the March 2015 session of WP.29.

Proposal to specify that conditioning of exhaust or silencing systems is required only in cases where the fibrous materials are in contact with exhaust gases because there is no possibility for the dispersion of fibrous materials under any other condition.

The current text of UN R41 provides an allowance that increases the noise limit value by 1 dB(A) for motorcycles tested only in second gear under Annex 3. This allowance expires on 1 January 2017. IMMA proposes to extend this allowance until 1 January 2018 in response to the delayed implementation of UN R41-04 in the EU (2016 instead of planned 2014).

UN R51 specifies that conditioning of a silencing system is necessary only in cases where exhaust gases come into contact with silencer fibrous materials. This proposal would apply the same concept in L category noise regulations.

Proposal to clarify the test procedure by explicitly excluding first gear where possible from the ASEP control range.

Proposal to delete category L₄ vehicles from the scope of the regulation. Motorcycles with a side car (L4 category vehicles) should be tested in a state that is designed to be operated on the road (i.e. the side car fitted to the vehicle) using the test procedures of UN Regulation No. 9. Since UN Regulation No. 41.04 does not cover motorcycles with a side car, this text should be deleted in order to avoid any potential misunderstandings.

Proposal to delete a description of the L₄ vehicle category (motorcycles with a side car) from Annex 3 to Regulation No. 41. These vehicles fall under the scope of UN R9, having been removed from the scope of UN R41 as of the 04 series of amendments.

Proposal to clarify under para. 2.2.3 the conditions under which multiple exhaust versions’ results may be listed on a single R41 approval certificate. The current text may be strictly interpreted as requiring separate certification for every possible configuration, such as differences in exhaust systems, intakes or engine displacements. The proposal aims to improve efficiency and effectiveness of type approval procedures.

In informal document GRB-66-12, Germany suggested making ASEP testing mandatory under UN R41.
This proposal from IMMA amends UN R41 towards the application of ASEP test procedures.

Proposal is to correct an omission regarding the compensating resevoir fill time thereby aligning UN R41 with the other noise UN Regulations Nos. 9, 51 and 63.

Proposal to allow multiple exhaust and/or silencing system configurations to be explicitly listed under the same motorcycle type approval in order to reduce redundancy and number of separate approvals and documentation.

Demonstration provided by the US Motorcycle Manufacturers Association.

Proposal to minimize proliferation of approval numbers from models with differences in vehicle exhaust and silencing systems.

The text prepared by the expert from the International Motorcycle Manufacturers Association (IMMA) to amend UN Regulation No. 41-04 (up to Supplement 7), in order to clarify the implications of footnote one on the requirements specified in Annex 4.

Proposal for amendment by IMMA to address the issue of stationary noise measurements on a single sided dual exhaust system.

The text was prepared by the expert from the International Motorcycle Manufacturers Association (IMMA) to amend the ASEP requirements

Presentation by the expert of IMMA supporting the proposed amendment to ASEP (GRBP-71-17)

The text was prepared by the expert from the International Motorcycle Manufacturers Association (IMMA) to amend Supplement 6 to 04 series of amendments, aiming to minimize proliferation of approval numbers

Per the transitional provisions of Supplement 3 to the 04 series of amendments, from 20 January 2021, the specifications for the test site reproduced in Annex 4 will be replaced by the provisions of ISO 10844:2014. Therefore, this proposal aims to align the 04 series of amendments with ISO 10844:2014, replacing provisions from ISO 10844:1998 (and proposing a clearer image for Figure 1).

Proposal to correct some references, which need to be updated as a consequence of document WP.29/2020/70, adopted at the June 2020 WP.29 session, notably

1. Paragraph 5.4.1 renumbered as paragraph 5.5.1.
2. Paragraphs 5.4. and 5.5. respectively renumbered as paragraphs 5.5. and 5.6.

Proposal to complete the additional sound emission provisions’ table of the communication form in the 05 series of amendments to UN R41 to avoid oversight in data collection and entries.

1. Proposal to amend the 04 and 05 series of UN R41 and the 02 series of UN R63 to allow use of the latest state of the art ISO 10844 test track.
2. ISO has updated the ISO 10844 standard to reduce track-to-track variability caused by differing interpretations and implementations of the technical requirements. The tyre/road contribution to the overall sound performance of a motorcycle is lower compared to cars.
3. The improvements from the ISO 10844:2014 to the 2021 version would not result in a need for updating the surface for L-category test tracks: Updating the ISO 10844 reference would have negligible impact on the measurement procedure and measurement results.
4. If however the ISO reference in the L-category noise regulations would be updated without maintaining the current ISO 10844:2014 as an option, IMMA sees a potential risk of tracks needing recertification, creating administrative burden with no practical benefit.
5. If later on, the tracks would need re-surfacing anyway (e.g. due to wear), then these can be built and certified according to ISO10844:2021. Because of the above, IMMA would like to allow certification with the tracks complying to either ISO10844:2014 or ISO10844:2021.
6. This proposal takes the opportunity to introduce proposals for additional corrections in R41/04 and R41/05 as specified below:
   • Supplement 9 to the 04 series of amendments to UN Regulation 41 introduced a new paragraph 12.4, needing to renumber the (former) paragraphs 12.4 to 12.9 (WP.29/2021/4). Due to this renumbering, the reference to paragraph 12.7 in Annex 6 footnote a, and Annex 7 paragraph 2.6 is no longer correct and should be replaced by a reference to paragraph 12.8.
   • With the introduction of the 05 series of amendments the Transitional Provisions were rewritten and footnote a of Annex 6 became obsolete.

Proposal to allow using the state-of-the-art test track from the latest standard ISO 10844:2021.

Proposal to allow using the state-of-the-art test track from the latest standard ISO 10844:202

Replace the proposal for Supplement 3 of the 05 Series of amendments

Proposal to replace the Supplement 11 of the 04 Series of amendments

Working draft interpretation provisions to clarify the application of the Annex 7 ASEP testing conditions of motorcycles.

Proposal to strengthen provisions against test defeating and to facilitate Conformity of Production testing.

Proposal to strengthen provisions against test defeating, to facilitate Conformity of Production testing, and to correct the communication document.

Proposal to clarify the gear selection procedure pursuant to the amendment to allow deviation from the reference acceleration a_wot,ref requirement for Conformity of Production tests.