ISO 17479:2013

Motorcycles - Measurement methods for gaseous exhaust emissions during inspection or maintenance

ISO 17479:2013 specifies methods for the direct measurement of the concentration of gaseous exhaust emissions from motorcycles as defined in ISO 3833 during inspection or maintenance. The results measured by this International Standard show the concentration of gaseous exhaust emissions in the no-load engine operating condition. It is applicable to motorcycles having spark ignition engines (four-stroke engines or two-stroke engines). This methods can be used, either totally or partially, for a) periodic inspections in official garages, b) official roadside checks, and c) maintenance and diagnostic operations.

Motocycles — Méthode de mesure des émissions gazeuses au cours des inspections ou de la maintenance

General Information

• Status: Published
• Publication Date: 10-Apr-2013
• ICS: 13.040.50 - Transport exhaust emissions
• ICS: 43.140 - Motorcycles and mopeds
• Technical Committee: ISO/TC 22/SC 38 - Motorcycles and mopeds
• Drafting Committee: ISO/TC 22/SC 38/WG 1 - Pollution and energy
• Parallel Committee: ISO/TC 43/SC 1 - Noise
• Current Stage: 9093 - International Standard confirmed
• Start Date: 05-Jun-2025
• Completion Date: 13-Dec-2025

Relations

• Consolidated By: ISO 4210-2:2015 - Cycles - Safety requirements for bicycles - Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles
• Effective Date: 06-Jun-2022
• Amended By: ISO 17479:2013/Amd 1:2020 - Motorcycles - Measurement methods for gaseous exhaust emissions during inspection or maintenance - Amendment 1
• Effective Date: 21-Aug-2021

Overview

ISO 17479:2013 - "Motorcycles - Measurement methods for gaseous exhaust emissions during inspection or maintenance" specifies direct measurement methods for gaseous exhaust emissions from motorcycles (spark-ignition, two‑stroke or four‑stroke) under the no‑load (idling) engine operating condition. The standard is intended for use during periodic inspections, official roadside checks, and maintenance or diagnostic operations to assess concentrations of CO, HC and CO2 at idling.

Key topics and requirements

• Scope and applicability: Applies to motorcycles as defined in ISO 3833 with spark‑ignition engines; measurement at idling condition.
• Instrumentation: Requires an exhaust gas analyser meeting ISO/PAS 3930/OIML R99, surface temperature meter (±2 K accuracy between 323 K and 373 K), pulse revolution counter (specified rpm accuracy ranges), and ambient temperature meter (±2 K between 278 K and 313 K).
• Pre‑use checks & maintenance: Calibrate and zero/span check analysers (reference gases or electronic methods). Perform checks at start of day, when ambient conditions change, or at new test sites. Follow manufacturer and national maintenance schedules.
• Motorcycle preparation: Warm up per manufacturer. If unspecified: four‑stroke engines warmed until oil drain bolt head surface reaches 328–343 K; two‑stroke warmed by running ≥15 minutes or ~5 km in urban conditions. Ensure choke is off and exhaust system is leak‑proof.
• Sampling & measurement procedure: Insert sampling probe at least 600 mm into exhaust outlet (use extension if needed). For multiple outlets, combine or average outlets per the standard. Use the highest analyser scale, wait ≥15 s after probe insertion, measure for up to 30 s to obtain minimum and maximum values and report the arithmetic mean.
• Corrections & reporting: Measured values shall be corrected per national requirements; Annex B gives example correction formulas (including methods for engines with secondary air systems and separate two‑stroke/four‑stroke CO corrections). Presentation of results is specified in Annex A (test report fields, units, engine and analyser details).

Applications

• Vehicle inspection stations and official roadside enforcement for on‑site emissions checks.
• Repair shops and technicians for diagnostics and maintenance verification.
• Regulators and type‑approval authorities to define inspection protocols.
• Equipment manufacturers developing portable exhaust gas analysers and probes.

Keywords: ISO 17479:2013, motorcycle emissions measurement, gaseous exhaust emissions, idling condition, exhaust gas analyser, inspection, roadside checks.

Related standards

• ISO 3929 (road vehicles - similar inspection methods)
• ISO 3833 (vehicle definitions)
• ISO/PAS 3930 / OIML R99 (instruments for measuring vehicle exhaust emissions)

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 17479
First edition
2013-04-15
Motorcycles — Measurement methods
for gaseous exhaust emissions during
inspection or maintenance
Motocycles — Méthode de mesure des émissions gazeuses au cours
des inspections ou de la maintenance
Reference number
©
ISO 2013
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Instrumentation . 1
5 Check, maintenance periodicity and precautions for use of instruments .2
5.1 Check before use . 2
5.2 Maintenance periodicity . 2
5.3 Precautions for use . 2
6 General motorcycle verification . 2
7 Normal conditioning of motorcycle . 3
7.1 Warming up . 3
7.2 Test conditions . 3
8 Gaseous exhaust emissions and corrections . 3
9 Measurement methods for gaseous exhaust emissions . 3
Annex A (normative) Presentation of results. 5
Annex B (informative) Examples of gaseous exhaust emissions correction method.8
Bibliography .10
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 22, Motorcycles.
iv © ISO 2013 – All rights reserved

Introduction
This International Standard specifies methods for the direct measurement of the concentration
of gaseous exhaust emissions from motorcycles during inspections, official roadside checks or
maintenance. Although ISO 3929 specifies methods for the direct measurement of the concentration of
gaseous exhaust emissions from road vehicles, this International Standard is the adaptation of ISO 3929
to comply with needs specific to motorcycles.
INTERNATIONAL STANDARD ISO 17479:2013(E)
Motorcycles — Measurement methods for gaseous exhaust
emissions during inspection or maintenance
1 Scope
This International Standard specifies methods for the direct measurement of the concentration of gaseous
exhaust emissions from motorcycles as defined in ISO 3833 during inspection or maintenance. The
results measured by this International Standard show the concentration of gaseous exhaust emissions
in the no-load engine operating condition. It is applicable to motorcycles having spark ignition engines
(four-stroke engines or two-stroke engines). This methods can be used, either totally or partially, for
— periodic inspections in official garages,
— official roadside checks, and
— maintenance and diagnostic operations.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
1)
ISO/PAS 3930/OIML R99 , Instruments for measuring vehicle exhaust emissions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
idling condition
no-load operating condition of engine warmed up in accordance with 7.1, with no manual operation
with fuel system controls (throttle, choke, etc.); the gear in neutral, and the manual clutch engaged for
motorcycles with the manual transmission; the parking condition for motorcycles with the automatic
transmission; and standard production equipment, accessories and optional equipment that modify the
engine speed used in accordance with the manufacturer’s recommendations or regulatory requirements
Note 1 to entry: Automatically operated headlamps are standard production equipment. There is a possibility
that headlamp operation influences the test results of gaseous exhaust emissions.
3.2
idling speed
engine speed (range) specified by the manufacturer under the idling condition
4 Instrumentation
The instruments listed below shall be prepared:
4.1 Analyser, in accordance with ISO/PAS 3930/OIML R99, suitable for the concentrations of gaseous
exhaust emissions from the motorcycles under test.
1) Joint ISO/OIML (International Organization of Legal Metrology) document.
4.2 Surface temperature meter, with a measurement accuracy of at least ± 2 K between 323 K and 373 K.
4.3 Pulse revolution counter, for measuring engine speed. The measurement accuracy shall be at
−1 −1 −1 −1
least ± 20 min between 600 min and 2 000 min , and shall be at least ± 50 min between over
−1 −1
2 000 min and 6 000 min .
4.4 Ambient temperature meter, with a measurement accuracy of at least ± 2 K between 278
...