ARCHIVESHISTORIQUES
DELACOMMISSION
COLLECTION RELIEEDES
DOCUMENTS "COM"
COM(75)634
Vol.1975/0238

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COMMISSION OFTHEEUROPEAN COMMUNITIES
COM(75)634 final
Brussels ,12December 1975
Proposal for a
COUNCIL DIRECTIVE
ontheapproximation ofthelaws of
theMember States relating tothe
permissible sound level and tothe
exhaust system ofmotor cycles
(submitted totheCouncil bytheCommission )
00-1(75 )634final

EXPLANATORY MEfElAITDUM
1»General
ThisproposalforaDirective comeswithinthescopeoftheCommunity-level
type-approval procedure formotorcycleswhichwasthesubjectoftheproposal
foraDirective submitted bytheCommission totheCouncilon24July1974(l)»
Thisproposal concernstheapproximation ofthelawsoftheMemberStatesrela­
tingtothepermissible soundlevelandtheexhaustsystemsofmotorcycles#
Inaletterof31January1974*"theFrenchGovernment notifiedtheCommission ,
pursuanttotheagreement of28May19&9concerning thestatusquoandkeeping
theCommission informed ,ofitsintention toamendFrenchlegislation inthis
resnrd,Hot/ever,theGovernment hasagreedtopostponeputtingitsdraftinto
forceuntilthoCouncilhasadoptedaDirective ,
OtherMemberStates'toohavelegislation ,eitheratthedraftstageorin
force,concerning theseaspectsofmotorcycles.Beingawareofthedifferences
betweentheprescribed soundemissionlevelswhicharelikelytocreatebarriers
totrade,theCommission isproposing ,pursuanttoArticle100oftheTreaty,
Community-lovel provisions aimedatharmonizing thenational provisions in
forcewhichaffecttheestablishment andthefunctioning ofthecommonmarket.
Furthermore ,thedeclaration oftheCounciloftheEuropean Communities andof
therepresentatives ofthegovernments oftheMemberStatesmeetinginthe
Councilon22Uovember 1973onthesubjectoftheenvironment programme ,pro­
videsforareduction ofthesoundemissions ofmotorcycles .Motorcycles
represent abynomeansnegligible proportion ofthemotorvehicles onthe
roadsinurbancentres.Moreover ,thistypeofvehicleistendingtoincrease
innumber.Furthermore ,invietvoftheirtechnical characteristics ,these
vehiclesarefrequently usedatfullthrottle ,i.e.:atveryhi$ienginespeeds.
Ithasbeenprovedthatwithmostmotorcyclesa.20cJoincreaseinspeedcauses
atleastadoubling ofthesoundintensity 1emitted, j.--
Itfollovrsthatmotorcyclesconstitute averyimportant sourceofnuisance ,
ifnotthemostannoying ,amongthelandvehicles ,andparticularly sincethe
application ofCouncilDirective 70/157/EECof6February1970ledtoanappre­
ciablereduction inthenoisepollution causedbyfour-wheeled motorvehicles#
(l)C0M(74)1175finalof24July1974

2,Comments ontheproposalforaDirective
xhescopeislimitedtotwoorthree-wheeled motorcycleswhose
maximumdesignspeedisgreaterthan45kn/h,Inthecaseofa
three-wheeled vehicle moreover ,theemptyweightshallnote::ceed
400kg,....
Article 2integrates into .theEECtypei-approval procedure theprovi­
sionsrelatingtothepermissible soundlevelandtotheesdiaust
systemofsuchmotorcycles.
SincecertainIlemberStatesdonotatpresenthaveatype-approval
procedure oftheirown,itisnecessary tolaydovmprovisions
ensuripgthatvehicles conforming totherequirements oftheDircc-'ive
(Article3)(l)intheseStatesareallowedtobeused*
Wheretheprototype isniodified ,theIleraberStatewhichcarriedout
thetypeapproval mustbeinapositiontoassesswhetheritis
appropriate to'performfreshtests(Article4).
Article 5laysdowntheprocedure foradaptingtheprovisions of
theannexestotechnical progress ,thisprocedure beingsetoutin
Article 13oftheCouncil Directive of onthe
type-approval 'ofmotorcycles .(2) . ■•
Article'6providesfortwodeadlines.Beforethefirstdeadline ,V
theIlemberStatesmustadoptandpublishthemeasuresnecessary to
comply'withtheDirective,Theseconddeadline determines thedate
onwhichalltheIlemberStatesmustsimultaneously putthecoramon
rulesintoforce(article6(l)),
(l)-OJh73of27.31^2"Documentsconcerning theaccessiontotheEuropeanCommunities oftheKingdomofDenmark,Ireland,theKingdomofUorway-;
andtheUnitedKingdomofGreatBritainandNorthernIreland",
Actconcerning theconditions ofaccession andtheadjustments tothe
treaties –AnnexI,titleX,
(2)0011(74)1175 finalof24,7.1974. ... .;

Finally,theCommission must "beinformedwithinareasonable timeofall
draftprovisions drawnupbytheMemberStatesinthefieldreferredtoby
theDirective ,thepurposeofthisinformation beingtoenabletheCcnanission
whatever commentsitmayhavetomakeonthesedrafts(Article6(2)).
Thetechnical annexescontaintherequisite definitions ,theprocedure for
application forEECtypo-approval ,thelimitstobeobserved asregardsthe
soundlevelduringthetestingofmotorcycles inmotionandtherequirements
concerning measuring instruments ,conditions andmethods.-
Awidemeasureofagreement wasachieved betweentheexpertsfromtheMember
Stateswhoassistedthecompetent departments oftheCommission inmatters
concerning thetestrequirements whenthisDirective wasbeingdrawnup.
Theserequirements statethateachtypeofmotorcycle mustbesubjected to
<5,testwhileinmotionandatestwhenstationary tobeabletoobtain
EECtype-approval inrespectofitssoundlevel.However,onlytheresults
ofthetestinmotionaretobecompared withthepermissible limitsandwill
"bedeterminating asregardsthetype-approval orrejection ofthevehicle.
Theresultsof"stationary "testwillonlyberecorded andshouldserveas
areference forthecompetent authorities wheninspecting vehicles ontheroad
Themethodformeasuring thesoundlevelofmotorcycles inmotionisbased
cntheprinciple that,bearinginmindtheirnormalconditions ofusein
urbantraffic,thespeedoftheengineisthemaincriterion forthenoise
provoked.Inconsequence ,thismethodwasspecified insuchawayasto
ensurethatmotorcycles ofeverycategory reachedatleastthree-quarters
oftheirmaximumenginespeedtowardstheendoftheacceleration period,a
condition inwhichtheengineatfullloadgenerally developsitsmaximum
soundlevel.Thismeansthat,onthetestsitespecified intheDirective ,
motorcycles are,withoutexception ,tobetestedinthegea?ratioimmediately
abovethestartingratio.Thiscondition ,however ,hasprovedtobevery
difficult toapplyinthecaseofcertaincurrenttypesofmotorcycle witha
cylindercapacitybelow350cm^andequippedwithgearboxeshavingmore
thanfourratios.Toenablethemanufacturers ofsuchmotorcycles toadapt
theirproductstotheprovisions ofthisDirective withinanappropriate
time–limit,atransitional periodoftwoyearsisscheduled ,-during-which_.

-4-
the"inmotion"testforthemotorcycles inquestionisto"becarriedout
inthirdgear,..i;. ■-
Withregardto.thelimit -valuesforthesoundlevelofthevariouscategories
ofmotorcycle ,,theCommission 'sproposal metwiththeproposal ofonlysome
ofthenational experts;itnonetheless represents ahappymedian "between
jtheextrem .positions adoptedbycertainexperts.
3.Consultation withtheEuropean Parliament andtheEconomic andSocialCommittee
,.Incompliance withtheprovisions of.thesecondparagraph ofArticle100,
itisnecessary toobtaintheopinions ofthesetwobodies.

-5-
THECOUNCIL OPTHEEUROPEAN COMMUNITIES ,
Having regard totheTreaty establishing theEuropean Economic
Community ,andinparticular Article 100thereof ;
Having regard totheproposal from theCommission ;
Having regard totheOpinion oftheEuropean Parliament ;
Having regard totheOpinion oftheEconomic andSocial Committee ;
Whereas thetechnical requirements which motorcycles must satisfy
inaccordance with national laws relate ,inter alia ,;tothe
permissible sound level and totheexheust system ;
Whereas these requirements differ from oneMember State to
another ;whereas itistherefore necessary that all theMember
States adopt thesame requirements ,either inaddition toorin
place oftheir existing rules ,inorder toallow theEECtype-
approval procedure which was the subject ofCouncil Directive
No of ontheapproximation ofthe
laws oftheMember States relating tothe type-approval ofmotor­
cycles tobeapplied inrespect ofeach type ofvehicle ;
Whereas theincreased numbers anduse ofmotorcycles aggravates
the .annoyance caused bynoise pollution ,andwhereas therefore "
thenoise emissions ofmotorcycles should belimited onthebasis
ofarepresentative method oftesting ;
Whereas theapproximation ofnational laws relating tomotorcycles
entails thereciprocal recognition byMember States ofthetests
carried outbyeach ofthem onthebasis ofcommon requirements ;
whereas inorder towork properly such asystem ,involves the
application ofthese requirements byallMember States with effect
from thesame date ,.
s
» '4 '' :'» "
HAS .ADOPTED THIS DIRECTIVE : .- = . - .--.i nx
(1)C0M(74 )2177 final of20.XII .1974 .

Article 1
For thepurposes ofthis Directive ,"motorcycle"' means any
vehicle having twoorthree wheels ,with amaximum design speed
exceeding 45km/h."Inthecase ofavehicle having three wheels ,
additionally theunladen weight shall -not exceed 400kilogrammes .
Article 2
NoMember State may refuse togrant EEC type-approval ornational
type-approval ofamotorcycle ongrounds relating .tothe
permissible sound level ortheexhaust system ofitssound level
andexhaust system satisfy therequirements setoutinAnnex I.
Article 3
NoMember State may refuse theregistration ormay prohibit the
sale ,entry into service oruse'ofanymotorcycle ongrounds
"relating to "thepermissible sound level ortheexhaust sytem if
itssound level andexhaust system satisfy therequirements set
out inAnnex I. '
Article 4
TheMember State which hasgranted type-approval shall take the
necessary measures toensure that itisinformed ofanymodification
ofapart orcharacteristic referred toinitem 1,1,' ofAnnex I.
The competent authorities ofthat State shall determine whether
fresh tests should becarried outonthemodified vehicle type and
afresh report drawn up.Where such tests reveal afailure to
comply with therequirements of "this Directive ,themodification
shall not beapproved .
Article 5
Theamendments necessary toadapt the'provisions ofAnnex I,IIand
III totake account oftechnical progress shall beadopted .in
accordaiidei with thSprocedure laid down inArticle .13ofCouncil
Directive No of onthetype-approval
ofmotorcycles . •

Article 6
1,Member States shall adopt andpublish by1October J.977 the
provisions necessary tocomply with this Directive andshall ,
forthwith inform theCommission thereof ,Uhey shall implement
these provisions with effect from 1October 1978 ,
2.After notification ofthis Directive ,Member States shall take
steps toinform theCommission ,insufficient time forittomake
comments ,ofanydraft laws ,regulations oradministrative
provisions which they intend toadopt inthefield covered by
this Directive .
Article 7
This Directive isaddressed tothe Member States i

ArîIIEXI
DBHIO-TIOITS ,APPLICATIONS FOREECTYPEWIPPROVAL ,EECTIFE-JIPPROVAL ,FER-
IHSSIBLE SOOHDLEVELS.EXHAUST SYSTSti
1*ICTTKETIOFS
Forthepurposes ofthisDirective :
1«1»' "Typeofmotorcycle asregardsitssound,levelandexhaustsystem"
meansmotorcycles whichdonotdifferinsuchessential respectsas*
1#1»1»typeofengine(two?-orfour-stroke ,numberandvolumeofcylinders ,
a>
numbgrofcarburettors ,arrangement ofvalves,maximumpowerspeed,
etc,);.
l*l»2«transmission system,inparticular thenumberofgearratios;
number,typeandarrangement ofexhaustsystems;
1.2# "Exhaust system"meansacompletesetofcomponents necessary to
limitthenoisecausedbyamotorcycle andbyitsexhaustj
1»3«"Exhaustsystemsofdifferent types"meanssystemswhichdonot
differinsuchessential respects asj
1«3»1»systemswhosecomponents beardifferent factoryortrademarks;
1.3.2*systemsimwhichthecharacteristics ofthematerials forming
anycomponent aredifferent orwhosecomponents areofadifferent
shapeorsize;
1,3«3*systemsinwhichtheoperating principles ofatleastonecomponent
aredifferent ;
1»3*4»systemswhosecomponents areindifferent combinations ;
•••/•••

AnnexI
1.4."Component (*)ofanexhaustsystem"meansoneoftheindividual
components whichtogether formtheexhaustsystem(exhaustpipes
andtubes,thesilenceritself,etc#)#
**•» *
2....~APPLICATION FOREECTYPE-APPROVAL ...
2.1#Theapplication forEECtype-approval ofAmotorcycle typewith
regardtoitssoundlevelandtheexhaustsystemshallbepresen­
tedbythemanufacturer orhisagent.
2.2.Itshallbeaccompanied bytheundermentioned documents in
triplicate andthefollowing information :
2.2.1#adetaileddescription ofthetypeofmotorcycle withregardto
thecriteriamentionedinitem1.1.above.Thenumberand/or
symbolsthatcharacterize theengineandvehicletypemustbe
shown;.
2#2.2.alistofthecomponents ,dulyidentified ,whichformtheexhaust
system;
'2.2.3# asketchofthesystemas-awholeandanindication ofits
position onthemotorcycle ;
2.2*4#detailed sketchesrelatingtoeachcomponent sothatitmaybe
easilylocatedandidentified together withinformation onthe
materials ofwhichitismade.
2.3»Avehiclewhichisrepresentative ofthemotorcycle typetobe
type-approved mustbepresented tothetechnical department
responsible forthetype-approval tests. 1
2.4#Attherequestofthatdepartment ,themanufacturer shallin
•additionpresentaspecimenoftheexhaustSystem#
Α
3# EECTYPE-APPROVAL
3#1# Aformconforming tothemodelinAnnexIIIshallbeattachedto
theEECtype-approval certificate .
(*)Iftheengineisequippedwithanairfilterwhichisindispensablelorthepurposeofcomplying withsound-level limitvalues,itshallbeconsidered asacomponent oftheexhaustsystem#

1
i -
«.3-
M f
if. PERMISSIBLE SOUND LEVELS
4,1„» Limits
The sound level ofthemotorcycles referredto inArticle "1of
this Directive ,when measured under theconditions setout in
points 4*2*to4»4«ofthi'sAnnex ,maynotexceed thefollowing -
levels :
(Category ofCubic Capacity
! r(cm )Permissible Sound Level
■dB (A)\
•# •
ι : Γ­
Ι" 4 50W ll»ll ■I 1 1
' * 80
c:125 *' 82
!- :.4550 84 .,
«' ι··· ■*"(·'♦
! è500 ... j' °5 ,=
! >500 ! 86
three-wheeled vehicles
ι _ ..·■·.' !85 • • » ·Κ
Measuring instruments (noise ofmotorcycles in"motion )
4.2.1 -» ,Acoustic measurements '1 ...»■
4.2.1.1 *Theapparatus used formeasuring thenoise level must bea
precision instrument ofthetype described inPublication -379
"Precision sound-level meters ",2ndedition *oftheInterna­
tional Electrotechnical Commission (ISC).Measurements shall
! becarried outusing the "fast "display speed andthe"A""1
.weighting Curve . •■"'
4.2.1 ,2-»Atthebeginning andendofeach series ofmeasurements the
.sound-level meter shall becalibrated according tothe mjin.u-
facturer ,sinstructions with asuitable acoustic source
(e.g. pistophone ). .
4.2 .1«3 *Speed measurements
Engine speed ,motorcycle speed andacceleration distance shall
bedetermined towithin +

-k-
Conditions ofmeasurement (noise ofmotorcycles inmotion )'
^•3*1 « Condition ofmotorcycle
4-.3.1 »1•During themeasurements theweight ofthemotorcycle with
driver must comply with point 2,kmoftheModel Information :
Document (Council Directive of (1).
Before themeasurements aremade ,thevehicle engine must be
brought tonormal operating temperature .The automatic .
actuating mechanism offans which are switched onand off
automatically shall ^notbeinterfered with during thenoise
measurements .For vehicles having more than onedriven wheel ,
only the drive provided fornormal road operation shall be
used .Where amotorcycle isfitted with aside-car ,the side­
car ,shall beremoved forthepurppses ofthe test .. *
^.3.2 . Test-site
k.3.2.1 .The test-site must consist ofacentral acceleration section
surrounded byasubstantially flat test-site .Theacceleration
section must beflat ;its surface must bedry «and such that
rolling noise remains low.- "
Onthe test-site the variations inthe free sound field between
the sound source atthe centre ofthe acceleration seetion and
themicrophone must not exceed +dB.This condition isdeemed
tobemetifthere arenolarge objects which reflect ^ound ,
such asfences ,rocks ,bridges orbuildings ,within 50mof
the centre ofthe acceleration section .The surface ofthe
track must bemade ofconcrete ,asphalt ofthehot rolled type
oranyother acoustically equivalent material within aband
10mwide onboth sides ofthe centre ofthe acceleration
section and befree ofpowdery snow ,tall grass rloose soil
orashes .-
(1)comC ?^)2177 .
•/•

-5-
Themicrophone shall not beobstructed inanywaywhich could
affect thesound field ,andnopersons should stand between
v.*:the -microphone -and -thesound source ♦Theob&erV -er-earrying *
out themeasurement must position himself sothat hedoes not
affect thereading ofthemeasuring instrument#
k»3>«2.2 ,Measurements maynotbecariedoutinbad (weather »Wind
effects must beexcluded ., , ■
Intype testing measurements ,theA-weighted sound level of
noise sources ,other than themotorcycle tobetested orof
wind effects must be-at least of10dB(A )below th6sound
level produced bythemotorcycle .Asuitable wind shield may
,{ -,befitted tothemicrophone provided that acoount istaken of
its effect onthe "sensitivity ofthemicrophone . •-
****** Method ofMeasurement (noise ofmotorcycle inmotion )
4.^.1 , Measurement ofnoise ofmotorcycle inmotion .. ...
4.'+♦,1.1 ,Themicrophone shall belocated 7*5mfrom theline ofrefe­
rence CC' (Fig *1)ofthetrack ,1.2mabo;ve thelevel ofthe
( track .Themotorcycle shall bedriven over theacceleration
section insuch away that theprojection ofthelongitudinal
median plane ofthevehicle isasclose aspossible toline CC**.
^./f.1.2 «,Atleast twomeasurements shall bemade onboth sides <yfthe
.vehicle *
k.{t-.>1,»3 »/Themaximum -sound level indicated indecibels (dB)"and
i- evaluated by-means ofthe "A"weighting curve shall bemeasured
< .as *themotorcycle -isdriven between lines AA'andBB' (Fig .1).
-• •The .measurement isinvalid ifthere isfound tobeanabnormal
■,discrepancy between thepeak Value andthegeneral sound level ..

-6-
Operation ofthemotorcycle
Themotorcycle shall approach line AATatasteady speed as
specified in4.4.2.2 .to4.4.2.4 .When thefront endofthe
«
vehicle reaches theline AA' ,thethrottle shall beopened as
quickly aspossible tothe fully opened position .This posi­
tion shall bemaintained until the rear end ofthe vehicle
reaches line BB1;the throttle shall then bereleased as
quickly aspossible and allowed toreturn tothe idle position .
Ψ 4 ■■
Themotorcycle shall approach line AA' ,ataninitial steady
speed :
4<4«2»2.1 .of50km/h,thespeed ofrotation oftheengine being between
50and75%ofthespeed atwhich theengine develops it$
maximum power ,or
^.4.2.2.2 .less than 50krn/h,thesp'eed ofrotation oftheengine being
equal to75 .%ofthespeed atwhich theengine develops its
maximum power ,or
4.4.2,2 »3«more than 50km/h,thespeed ofrotation oftheengine being
equal to50%ofthespeed atwhich theengine develops its
maximufi power . .■v
4.4 .2.5.The .test shall becarried outinthegear ratio immediately ,.
above thestarting ratio ..However ,until .1stOctober 1980
motorcycles having acubic capacity ofnotmore than350cm^
'shall betested inthird gear iftheir gear-box hasmore than
four ratios .
4.4..2.4 .Formotorcycles without transmission controls theinitial
steady speed shall be :
•'+ ♦1•50km/h,thespeed ofrotation oftheengine being between
50and 75per cent ofthespeed atwhich the engine develops
itsmaximum power ror ..
4.^.2.4.2 .less than 50km/h,thespeed ofrotation oftheengine being
equal to75%ofthespeed atwhich theengine develops its
maximum power ..4.4.2 .
^.4.2.1 .
4.4.2.2 .
/

+7-
Results
Allconditions andinfluences affecting themeasurements shall
beindicated inthetest"recordinaccordance withtheAnnexII.
4.4.3.2«Readingfromthemeasuring instrument shallbetaken'tothe
nearesthalf-decibel ,""
,- Onlythosemeasurements maybeusedfortypeapproval whose
difference in.twoconsecutive testsonthesamesideofthe
motorcycle islessthanorequalHo 2dB.
4*^»3»3*Totakeaccountofinaccuracies intheinstruments ,theresult
--■ofeachmeasurement shallbearrivedatbydeducting 4dB-*"
fromthemeterreading. •
V*4«3»^«Thehighestvaluerecordedshallconstitute thetes-fc>'eeulW .
;Shouldthat:valueexceedbynotmorethan1dBthepermissible
soundlevelfortheclassofmotorcycle tested,-twofurther
measurements maybemade* t..
"Thelimitslaiddownin4.1•shallberegarded "asbeingcomplied
withifthreeofthefourmeasurements donotexceedtheper­
missible level." -,.- •
4.5*Measurement ofnoiseofstationary mo~torcycle '
Soundpressurelevelintheimmediate vicinity ofmotorcycles .
Formotorcycle asdefinedinArticle 1oft^epresentDirective
thesoundpressure levelshallbemeasured intheimmediate
vicinity oftheexhaustsystemoutlet(silencer )inaccordance
withthefollowing provisions ,theresultofthemeasurement
beingenteredinthetestrecordaslaiddowninAnnexXI.'
Soundmeasuring instrument .
Aprecision sound-level measuring instrument asdefinedin
^*2.1.1.and4.2.1,2.6hallbeused'.
:•• •: '...- ...<.••• -.....,■
'...._:r'..... ; .;■■■<-.

Condition ofthemotorcycle
During themeasurements theweight ofthevehicle must comply
with point 2,V«oftheInformation Document (Council Direc­
tive of (1))» Before themeasure­
ments aretaken thevehicle engine shall bebrought tothe
normal operating temperature .Inthecase offans which are
switched onand off automatically ,the automatic actuating
mechanism shall not beinterfered :with during the test *
During themeasurements themachine shall beinneutral gear .
Ifitisimpossible todisconnect thetransmission ,thedriving
wheel ofthemotorcycle must beallowed torotate freely ,for
example byplacing thevehicle onits centre stand#
Test track
Any area xnwhich there isnosignificant acoustic disturbances
may beused asatest track .Especially suitable are flat
■surfaces which arecovered with concrete ,asphalt orsome other
hard material andarehighly "reflective ;surfaces consisting
ofearth which has been tamped down must not beused .The
test track shall beinthe form ofarectangle the sides of
which are atleast 3mfrom theouter edge ofthemotorcycle .
There may benosignificant obstacles ,e.g. persons other than
the rider and theobserver within this rectangle .Themotor -
Icycle shall b«positioned within thesaid rectangle sothat
themicrophone used formeasurement isatleast 1mfrom any
' -.kerbstones which may bepresent . .
•Readings ofthemeasuring instrument dueto .background noises
andwind effects must beatleast 10dB(A )lower than the
silencer levels tobemeasured .Asuitable wind shield may
befitted tothemicrophone ,provided that account istaken
ofits effect onthesensitivity ofthemicrophone .
(t)C0M(7*t)217 7of20.12,197 **
•/•

Methodofmeasurement
Numberofmeasurements ';''•-• *
Atleastthreemeasurements shallbemadeateachpoint*
.Onlythosevaluesshallbe-usedwhich -havebeenobtained in
threeconsecutive measurements andwhichvarybynotmorethan
2dB(A)».*-
Testresuit
Thehighestofthethreemeasurements shallconstitute the
testresult.
Position ofmicrophone ..{Fig.-2).,
Themicrophone shallbelocatedlevelwiththeexhaustoutlet
butshallundernocircumstances belessthan0.2mabovethe
surfaceofthetrack.Themicrophone diaphragm mustface
towards theexhaustoutletandbelocatedatadistance of
0.5mfromit.Theaxisofth.emainsensitive areaofthe
microphone mustbeparallel tothesurfaceofthetrackatsin
angleof^5°.+.10°theverticalplaneofthe-direction of
theexhaustemissions .;-...;.
Inrelation tothisvertical plane,themicrophone shallbe
positioned ontheexternal sideofthevehiclecontouratthe
sidewhichgivesamaximumdistance betweenthemicrophone
andthevehicle contour.
Iftheexhaustsystemhasmorethanoneoutletwithacentre-
to-centre' distance' between :themoflessthan0.3m»themicro­
phoneshallbefaoedtowards'the'outletwhichiBnearestthe
vehicle whichishigherabovethesurfaceofthetrack.If
thecentresoftheoutletsaremorethan0.3mapart,separate
measurements shallbemadeforeachofthem,thehighestfi»
gure "recorded beingtakenasthetestvalue. '

-10«
Engine operating conditions
The engine speed shall beheld constant atone ofthe following
values S " , ,'.
S-– ifSexceeds 5.000rev/min ,
when Sisthespeed ofrotation at-which the "engine d'evelops its
maximum power . -; ,
When constant engine speed isreached ,thethrottle shall
suddenly bereturned totheidle position .Thesound level
themaximum deflection oftheneedle ,rounded off tothenearest
decibel ,being taken asthetest value .
Test record
All details regarding themeasurement ofthenoise emitted by -
stationary vehicles shall beentered inthe test record as
laid down inAnnex II.
EXHAUST SYSTEM (SILENCER )
Ifthevehicle isfitted with adevice designed toreduce the
exhaust noise (silencer ),therequirements ofitem 2shall apply .
Iftheinlet ofthe engine isfitted with anair filter which
isnecessary inorder toensure compliance with thepermissible
sound level ,thefilter shall beconsidered-rto bepart ofthe
silencer ,and therequirements ofitem 2shall also apply tothat
filter .
Adrawing ofthe exhaust system shall beannexed tpthe vehicle
type -approval certificate .
The silencer must bemarked with areference toits make and
type which isclearly legible andindelible .-¥ ifSdoes notexceed 5*000 rev/min .
shall bemeasured throughout the duration ofdeceleration

-11-
Theuseoffibrous ;absorbent materialispermitted'~in the
construction ofsilencers onlyifthefollowing conditions
arefulfilled : , *
Thefibrousabsorbent Material -maynotbeplacedinthps§
part§ofthesilencer through whichthegasespass.
Suitable devices mustensurethatthefibrous absorbent mate­
rialiskeptinplace'forthewhole"timethatthesilencer
isbeingused.
Thefibrousabsorbent material mustberesistent toatempera­
*tureatleast20%higherthantheoperating temperature which
mayoccurintheregionofthesilencer wherethesefibrous
absorbent materials aresituated . . 1■

-12-
FIG,1tMEASURING POSITIONS FORMOTORCYCLE INMOTION
c'
B– f–t
eβ
ο
Η
Pmior9>«7,3m_f 7t5mp>r\?;cro""phonè-^ • Â :Aphone
v.<
*
a
--." o
RH
*
•X :–––1_––– :
• W
t
PIG.2TMEASURING POSITION FORSTATIONARY MOTORCYCLES
I1 heightofexhaustaxleUe r~– •'..
liL1iCL 1
*T ^T£ :Të'M ■A4 1. :'^\Q,3m.1_/ jLy–-y,^vQ–T- ,4^1'' 4vAi'.

ANNEXII
TestrecordforMeasuring SoundLevelofMotorcycles
Appendix to.certificate n°,« ofthetechnical department of
1.
1.1.
1.2.
1.3.
1.4.
2.
2.1»
2.2.
2.3.
2.4.
3.
4.
4.1.Motorcycle -*. ...
Manufacturer orauthorized agent .
.Type:
Modelî
FraûieN°:.
Enginej
Manufacturer î
'Type'»•' :-
Modelî
-OutputtDateoftestt
Carriedoutby:
Gears: withoutgear manualgear
change change,..? .--îhp/kWatrev/min
automatic xx
Fittedwith x
Exhaustsilencer : Manufacturer :
Model ,:
'"■-•Type :"•»
Manufacturer î
Model :
"'1■;-»>■■-'--Type - •
Measuremerits -1'*'*"'*«■•*»»»»•«.
•Nciscofmotorcycle ,inmotion :«• v .r-.„,.t*c--•»4,2.,Intake .si-Lencer _
5.
5.1.According todrawing N°:
*According todrawing N°:
«*•.■t'
*V<■
<"8»i*'''4.v•.«.Measurement results
î– Position ofGear
Change ''left "*''
•■.dB(A)x..,.'right""
dB(A)*-
– ;; ]
1.Measurement ''I
*-*AU--vt•»;«*jpf.~v». 2Î-&ëàsurenôn&~-Hi.,.. •I
3»Measurement !
4.Measurement' rI""44' -
Testresultt''' dB(A)E
5.2.JJoiseofstationary motorcycle .:
IIIIil I
#M . %dB(À)"-*
».*,Test.englue ...speedmin""-Teste-'conditions xx
1.Measurement Sηβ– ·'·
6.•..
η=3/4·6-
*.«.■»< «2.Measurement
3»Measurement
Measurement result gdB(A)
k)Thevaluesindicated arethemeasurements obtained minus1dB(A)
xx)Tickwhereappropriate

ANMXIII
MODEL
ÏTaneofAdministration "!"
-t «
AMEXTOTHEEEC-TYPE APPROVAL CERTIFICATE WITHREGARD,TO
«'%-
PERMISSIBLE SOUHDLEVELANDTHEEXHAUST SYSTEM OPMOTORCYCLES ■.
(Article4(2)andArticle10oftheCouncilDirective •••••<
of•••«••• ontheapproximation ofthelawsoftheMember
Statesrelatingtothetypeapprovalofmotorcycles ]
1Type-appro va1
1*Tradenameormarkofthevehicle *•-
2..Vehicletype
3*Manufacturer 'snameandaddress ■.
-__»)
4*Ifapplicable ,nameandaddressofmanufacturer 'sauthorised "
representative
5.Vehiclesubmitted fortype-approval on
6,Technical serviceresponsible fortype-epproval tests••••••••.•••«•« ..
7..Dateofreportissuedbythatservice
8*Numberofreportissuedbythatservice •••••■•<•• _
!9*Type-Approval inrespectofsoundlevelandexhaustsystep
_10,Place
11.Date
.....12,Signature - "
13»Thefollowing documents ,bearingthetype-sppypval ^upbej?.shown,abOvG,v,,
areannexed t
.**systemoftheexhaustsystem ;
• thetestrecordformeasuring ,soundlevel
•.•-- -- >■
v"+4+"^iiifi*-*irS>OW 5«'-'ri/*''' !rv •
«.**»UV-.