Yamaha DT125E 1977 User manual

YAMAHA
DT125E/DT175E
OWNER'SMANUAL
2A6-28199-10

IMPORTANT:PLEASEREADTHISMANUALCAREFULLYANDCOM-
PLETELYBEFOREOPERATINGTHISVEHICLE.
Particularlyimportantinformationisdistinguishedinthismanualbythe fol-
lowingnotations:
NOTE: A NOTEprovideskeyinformationtomakeprocedures
easierorclearer.
CAUTION: A CAUTIONindicatesspecialproceduresthatmustbe fol-
lowedtoavoiddamagetothemachine.
WARNING:A WARNINGindicatesspecialproceduresthatmustbe
followedtoavoidinjurytoa machineoperatororperson
inspectingorrepairingthemachine.
DT125E/DT175EOWNER'SMANUAL
2ND. PRINTING,FEBRUALY1977
ALLRIGHTSRESERVED,
BYYAMAHAMOTORCOMPANY
LIMITED,JAPAN
PRINTEDINJAPAN
P/NLIT-11626-00-70

INTRODUCTION
Congratulationsonyourpurchaseofthe
YamahaDT125E/DT175E.Thismodelrepre-
sentstheproductofmanyyearsofYamaha
experienceintheproductionoffinesporting,
touring, andpace-settingracingmachines.
Youcannowappreciatethehighdegreesof
craftsmanshipandreliabilitythathavemade
Yamahaa leaderinthesefields.
PLEASEREADTHISMANUALCAREFU-
LLYANDCOMPLETELYBEFOREOPERA-
TINGYOURNEWMACHINE.Thismanual
willprovideyouwitha goodbasicunder-
standingofthefeatures,operation,andbasic
maintenanceandinspectionitemsofthis
vehicle.Ifyouhaveanyquestionsregarding
theoperationormaintenanceofyourma-
chine, pleaseconsultyourYamahadealer.
NOTICE:Somedatainthismanualmaybe-
comeoutdatedduetoimprovementsmadeto
thismodelinthefuture.Ifthereisanyques-
tionyouhaveregardingthismanualoryour
machine,pleaseconsultyourYamahadealer.
SERVICEDEPT.
INTERNATIONALDIVISION
YAMAHAMOTORCOMPANY,LTD.

CONTENTS
PAGE
NOMENCLATURE1
MACHINEIDENTIFICATION2
CONTROLFUNCTIONS3
PRE-OPERATIONCHECKS10
OPERATIONANDIMPORTANT
RIDINGPOINTS12
PERIODICMAINTENANCEAND
MINORREPAIR18
CLEANINGANDSTORAGE45
MISCELLANEOUS47
WARRANTYINFORMATION49
SPECIFICATIONS51

NOMENCLATURE
(6)(9
RIGHTSIDE
®(16)
INSTRUMENTS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Taillight
Muffler
Kickcrank
Headlight
Frontfender
Frontwheel
Brakepedal
Footrest
Frontfork
Fueltank
11.
12.
13.
14.
15.
Rearwheel
Sidestand
Changepedal
Clutchlever
Speedometer
16. Tachometer
17. Brakelever
18. Throttlegrip
19. Mainswitch
20. Oiltank
-1-

MACHINE
IDENTIFICATION
Frameserialnumber
Theframeserialnumberisstampedonthe
rightsideofthesteeringheadstock.
1. Frameserialnumber
Engineserialnumber
Theengineserialnumberisstampedintothe
raisedpartoftherightrearsectionoftheen-
gine.
NOTE:
Thefirstthreedigitsofthesenumbersarefor
modelidentifications;theremainingdigits
aretheunitproductionnumber.Theengine
andframeserialnumbersareusuallyidentical.

CONTROLFUNCTIONS
Mainswitch
Accordingtothemainkeyposition,the
ignitionandlightingsystemscanbeusedas
follows:
Key
position
OFF
ON
Description
Enginecannotbestarted.
Lightsandhorncannotbe
operated.
Enginecan bestarted.
Lightsandhorncanbe
operated.
.Key
removal
Possible
Notpossible
Hendlebarswitches
Thehandlebarswitchesarelocatednearthe
rightandlefthandlegripsandareusedfor
thefollowingfunctions:
"ENGINESTOP"switch
Makesurethattheenginestopswitchis
turnedto"RUN"position.Theengine
switchhasbeenequippedtoensuresafetyin
anemergencysuchaswhenthemotorcycleis
upsetortroubletakes placeinthethrottle
system. Theenginewillnotstartorrunwhen
theenginestopswitchisturnedto"OFF".
1. "ENGINESTOP"switch

"LIGHTS"switch
Turnthelightswitchtothe"ON"position
toturnontheheadlightandthetaillight.
"LIGHTS"switch(dimmer)
Turntothe"HI"positionforthehighbeam
andtothe"LO"positionforthelowbeam.
1. "LIGHTS"switch3."HORN"switch
2. "LIGHTS"switch(dimmer)4."TURN"switch
"HORN" switch
Pressbuttontosoundthehorn.
"TURN" switch
Thisisa three-wayswitch:thecenterposition
isoff;turntothe"L" positionfortheleft
flasherandtothe"R"positionfortheright
flasher.
Indicatorlights
"TURN" indicatorlight(orange):
Thislightflasheswheneitherturnin-
dicatorisON.
"NEUTRAL"light(green):
Thislightcomesonwhenthetransmission
isinneutral.
"HIGHBEAM"indicatorlight(blue):
Thislightcomesonwhentheheadlight
highbeamisused.
1. "OIL"cautionlight4."TURN"indicatorlight
2. "NEUTRAL"light
3."HIGHBEAM"indicatorlight

"OIL" cautionlight(red):
Thelightcomesonwhenthereislittleoil
intheoiltankthuswarningtherider.The
ridercancheckthecircuitbyputtingthe
machineinneutral.Boththeneutrallight
andtheoilcautionlightshouldcomeon.
NOTE:
Iftheoilcautionlightwillnotlightupduring
thistest,haveyourYamahadealercheckit.
Ofcourse,checktheoillevelfirst.
CAUTION: Donotrunthemachineuntil
youknownthemachinehasenoughoil.
J Mainswitch"ON"
Oilcautionlight
doesnotcomeon
Disconnectedcircuit,
short-ciruit,faulty
cautionlightbulbetc.
Oilcautionlight
comeson
Motorcycleingearl
AskYamahadealerOilcautionlight
toinspectcomeson
Oilcautionlight
doesnotcomeon Supplyengineoil
Speedometer
Theodometerandtripodometerarebuilt
intothespeedometer.Thetripodometercan
beresetto"0"byturningtheresetknob.
1. Resetknob3.,Odometer5.Tachometer
2. Tripodometer4.Speedometerg p;ecj
zone
Tachometer
Thetachometerisprovidedsotheridercan
keepenginerevolutions(rpm)withintheideal
powerrange.
CAUTION: Donotoperateintheredzone.
RedZone:8,000rpmandabove.

Fuelpetcock
Thefuelpetcocksupplysfuelfromthetank
tothecarburetorwhilefilteringthe fuel.
Thefuelpetcockhasthreepositions:
OFF: Withtheleverinthispositionfuelwill
notflow.Alwaysreturntheleverto
thispositionwhentheengineisnot
running.
ON: Withtheleverinthispositionfuel
flowstothecarburetor.Normalriding
isdonewiththeleverinthisposition.
RES: Thisindicates"RESERVE".Ifyourun
outoffuelwhileriding,movethelever
tothisposition.THEN,FILLTHE
TANKATTHEFIRSTOPPORTU-
NITY.
Starterknob
When cold, theenginerequiresa richerfuel
mixtureforstarting.A separatestartercircuit,
whichiscontrolledbythestarterknob,sup-
pliesthismixture.
Pulltheknobouttoopenthecircuitfor
starting. Whentheenginehaswarmeduppush
theknobintoclosethecircuit.
1. Starterknob