2002 YAMAHA YZ250LC transmission

EC085002
ILLUSTRATED SYMBOLS
(Refer to the illustration)
Illustrated symbols 1to 7are designed as
thumb tabs to indicate the chapter’s number and
content.
1
General information
2Specifications
3Regular inspection and adjustments
4Engine
5Chassis
6Electrical
7Tuning
Illustrated symbols 8to rare used to identify
the specifications appearing in the text.
8
With engine mounted
9Special tool
0Filling fluid
qLubricant
wTightening
eSpecified value, Service limit
rResistance (Ω), Voltage (V), Electric current (A)
Illustrated symbols tto oin the exploded dia-
grams indicate grade of lubricant and location of
lubrication point.
t
Apply transmission oil
yApply engine mixing oil
uApply molybdenum disulfide oil
iApply lightweight lithium-soap base grease
oApply molybdenum disulfide grease
Illustrated symbols pto ain the exploded dia-
grams indicate where to apply a locking agent
and where to install new parts.
p
Apply locking agent (LOCTITER)
aUse new one
GEN
INFO
12
3
5
74
6
8
90
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SPEC
INSP
ADJENG
CHASELEC
TUN
5NX-9-30-0 6/5/01 3:49 PM Page 14

ABGEBILDETEN SYMBOLE
(Siehe Abbildung)
Die abgebildeten Symbole 1bis 7
sind zur einfachen Auffindung der Sei-
ten mit Daumeneinkerbungen verse-
hen. Die Abschnittsnummer sowie der
lnhalt können sofort ersehen werden.
1Allgemein Angaben
2Technische Daten
3Regelmäßige Prüfung und
Einstellungen
4Motor
5Fahrgestell
6Elektrische Einrichtungen
7Tuning
Die abgebildeten Symbole von 8bis
rwerden zur Unterscheidung der
Spezifikationen in diesem Text
benutzt.
8Mit dem Motor eingebaut
9Spezialwerkzeug
0Einfüllen von Flüssigkeit
qSchmiermittel
wFestziehen (Anzugsmoment)
eVerschleißgrenze, Wartungs-
Toleranzgrenze
rWiderstand (Ω), Spannung (V),
elektrischer Strom (A)
Die abgebildeten Symbole tbis oin
der Explosionszeichnung zeigen die
Schmierstoffklasse sowie die
Schmierstellen an.
tGetriebeöl auftragen
yMotor-Mischöl auftragen
uMolybdändisulfid-Öl auftragen
iLeichtes Lithium-Fett auftragen
oMolybdändisulfid-Fett auftragen
Die abgebildeten Symbole pbis ain
der Explosionszeichnung zeigen die
Stellen, wo Sicherungslack aufzutra-
gen ist und neue Teile einzubauen
sind.
pSicherungslack (LOCTITE®)
auftragen
aNeues Teil verwenden
SYMBOLES GRAPHIQUES
(Voir l’illustration)
Les symboles graphiques 1à 7ser-
vent à repérer les différents chapitres et
à indiquer leur contenu.
1Renseignements généraux
2Caracteristiques
3Verification et réglages courants
4Moteur
5Partie cycle
6Partie électrique
7Mise au point
Les symboles graphiques 8á rper-
mettent d’identifier les spécifications
encadrées dans le texte.
8Avec de montage du moteur
9Outil spécial
0Liquide de remplissage
qLubrifiant
wSerrage
eValeur spécifiée, limite de service
rRésistance (Ω), tension (V), intensité (A)
Les symboles graphiques tà odans
les vues éclatées indiquent le grade de
lubrifiant et l’emplacement des points
de lubrification.
tAppliquer de l’huile de transmission
yAppliquer de l’huile de mélange du moteuruAppliquer de l’huile au bisulfure de molybdèneiAppliquer de la graisse fluide à base de savon
au lithium
oAppliquer de la graisse au bisulfure de
molybdène
Les symboles graphiques pet adans
les vues éclatées indiquent où appliquer
de l’agent bloquant et où installer de
nouveaux composants.
pAppliquer un agent de blocage
(LOCTITE®)
aUtiliser une pièce neuve
IC085002
SIMBOLI ILLUSTRATI
(Fare riferimento all’illustra-
zione)
I simboli illustrati da 1a 7sono pro-
gettati come linguette da sfogliare che
indichino il numero e il contenuto del
capitolo.
1Informazioni generali
2Specifiche
3Ispezione e regolazioni regolari
4Motore
5Telaio
6Parte elettrica
7Messa a punto
I simboli illustrati da 8a rvengono
usati per identificare le specifiche che
compaiono nel testo.
8Con motore montato
9Utensile speciale
0Liquido di riempimento
qLubrificante
wSerraggio
eValore specificato, limite di servizio
rResistenza (Ω), Tensione (V), Corrente
elettrica (A)
I simboli da ta oillustrati nei dia-
grammi esplosi indicano la qualità di
lubrificante e la posizione del punto di
lubrificazione.
tApplicare olio per trasmissioneyApplicare olio per miscela per motoriuApplicare olio a base di bisolfuro di molibdenoiApplicare grasso leggero a base di sapone di
litio
oApplicare grasso a base di bisolfuro di
molibdeno
I simboli pe aillustrati nei diagram-
mi esplosi indicano dove applicare
l’agente bloccante e dove montare il
pezzo di ricambio.
pApplicare agente bloccante
(LOCTITE®)
aUsare un pezzo nuovo
5NX-9-30-0 6/5/01 3:49 PM Page 15

CHAPTER 4
ENGINE
SEAT, FUEL TANK AND SIDE
COVERS.....................................................4-1
EXHAUST PIPE AND SILENCER..............4-3
RADIATOR..................................................4-4
CARBURETOR AND REED VALVE...........4-7
CYLINDER HEAD , CYLINDER AND
PISTON.....................................................4-18
CLUTCH AND PRIMARY DRIVEN
GEAR.......................................................4-33
KICK AXLE, SHIFT SHAFT AND
PRIMARY DRIVE GEAR...........................4-40
YPVS GOVERNOR...................................4-49
WATER PUMP..........................................4-52
CDI MAGNETO.........................................4-56
ENGINE REMOVAL..................................4-60
CRANKCASE AND CRANKSHAFT.........4-65
TRANSMISSION, SHIFT CAM AND
SHIFT FORK.............................................4-72
CHAPTER 5
CHASSIS
FRONT WHEEL AND REAR WHEEL........5-1
FRONT BRAKE AND REAR BRAKE.......5-10
FRONT FORK...........................................5-27
HANDLEBAR............................................5-40
STEERING................................................5-47
SWINGARM..............................................5-52
REAR SHOCK ABSORBER.....................5-59
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KAPITEL 4
MOTOR
SITZ, KRAFTSTOFFTANK UND
SEITENDECKEL.........................................4-1
AUSPUFFROHR UND
SCHALLDÄMPFER....................................4-3
KÜHLER......................................................4-4
VERGASER UND ZUNGENVENTIL...........4-7
ZYLINDERKOPF, ZYLINDER UND
KOLBEN...................................................4-18
KUPPLUNG UND
PRIMÄRABTRIEBSZAHNRAD................4-33
KICKSTARTERWELLE, SCHALTWELLE
UND PRIMÄRANTRIEBSZAHNRAD.......4-40
YPVS REGLER.........................................4-49
WASSERPUMPE......................................4-52
CDI-MAGNETZÜNDER.............................4-56
AUSBAU DES MOTORS..........................4-60
KURBELGEHÄUSE UND
KURBELWELLE.......................................4-65
GETRIEBE, SCHALTNOCKE UND
SCHALTGABEL.......................................4-72
KAPITEL 5
FAHRGESTELL
VORDERRAD UND HINTERRAD..............5-1
VORDERRADBREMSE UND
HINTERRADBREMSE..............................5-10
VORDERRADGABEL...............................5-27
LENKSTANGE..........................................5-40
LENKUNG.................................................5-47
HINTERRADSCHWINGE..........................5-52
HINTERRAD-STOSSDÄMPFER..............5-59
CHAPITRE 4
MOTEUR
SELLE, RESERVOIR A ESSENCE
ET COUVERCLES LATERAUX..............4-1
TUYAU D’ECHAPPEMENT ET
SILENCIEUX..............................................4-3
RADIATEUR...............................................4-4
CARBURATEUR ET
SOUPAPE FLEXIBLE...............................4-7
CULASSE, CYLINDRE ET PISTON.....4-18
EMBRAYAGE ET PIGNON
MENE PRIMAIRE....................................4-33
AXE DE DEMARREUR AU PIED,
ARBRE DE SELECTEUR ET PIGNON
DE TRANSMISSION PRIMAIRE..........4-40
REGULATEUR YPVS..............................4-49
POMPE A EAU.........................................4-52
MAGNETO CDI........................................4-56
DEPOSE DU MOTEUR...........................4-60
CARTER ET VILEBREQUIN.................4-65
BOITE A VITESSES, BARILLET
DE SELECTEUR ET FOURCHETTE...4-72
CHAPITRE 5
PARTIE CYCLE
ROUE AVANT ET ROUE ARRIERE......5-1
FREIN AVANT ET FREIN ARRIERE..5-10
FOURCHE AVANT..................................5-27
GUIDON.....................................................5-40
DIRECTION..............................................5-47
BRAS OSCILLANT..................................5-52
AMORTISSEUR ARRIERE....................5-59
CAPITOLO 4
MOTORE
SELLA, SERBATOIO DEL
CARBURANTE E COPERTURE
LATERALI..................................................4-1
TUBO DI SCARICO E
SILENZIATORE.........................................4-3
RADIATORE...............................................4-4
CARBURATORE E VALVOLA A
LAMELLA...................................................4-7
TESTA CILINDRO, CILINDRO E
PISTONE....................................................4-18
FRIZIONE E INGRANAGGIO
CONDOTTO PRIMARIO........................4-33
PEDIVELLA, ALBERO DEL
CAMBIO E INGRANAGGIO
CONDUTTORE PRIMARIO...................4-40
REGOLATORE YPVS.............................4-49
POMPA DELL’ACQUA...........................4-52
MAGNETE CDI........................................4-56
RIMOZIONE DEL MOTORE.................4-60
CARTER E ALBERO A GOMITI..........4-65
TRASMISSIONE, CAMMA DEL
CAMBIO E FORCELLA DEL
CAMBIO....................................................4-72
CAPITOLO 5
TELAIO
RUOTA ANTERIORE E RUOTA
POSTERIORE.............................................5-1
FRENO ANTERIORE E FRENO
POSTERIORE ..........................................5-10
FORCELLA ANTERIORE......................5-27
MANUBRIO...............................................5-40
STERZO.....................................................5-47
FORCELLONE OSCILLANTE..............5-52
AMMORTIZZATORE POSTERIORE..5-59
5NX-9-30-0 6/5/01 3:49 PM Page 21

1-1
DESCRIPTION
GEN
INFO
EC100000
GENERAL INFORMATION
EC110000
DESCRIPTION
1Clutch lever
2“ENGINE STOP” button
3Front brake lever
4Throttle grip
5Radiator cap
6Fuel tank cap
7Kick starter
8Fuel tank
9Radiator
0Coolant drain bolt
qCheck bolt (Transmission oil level)
wRear brake pedal
eValve joint
rFuel cock
tStarter knob
yDrive chain
uAir cleaner
iShift pedal
oFront fork
NOTE:
9The machine you have purchased may differ
slightly from those shown in the following.
9Designs and specifications are subject to
change without notice.
1
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1-1
DESCRIPTION
BESCHREIBUNG
DESCRIZIONE
GEN
INFO
ALLGEMEIN
ANGABEN
BESCHREIBUNG1Kupplungshebel
2Motorstoppknopf „ENGINE STOP“
3Handbremshebel
4Gasdrehgriff
5Kühlerdeckel
6Kraftstofftank-Verschluß
7Kickstarter
8Kraftstofftank
9Kühler
0Kühlmittel-Ablaßschraube
qPrüfschraube (Getriebeölstand)
wFußbremshebel
eVentilverbindung
rKraftstoffhahn
tStarterknopf
yAntriebskette
uLuftfilter
iSchalthebel
oVorderradgabel
HINWEIS:
9Die von Ihnen gekaufte Maschine
könnte etwas von den hier gezeigten
Abbildungen abweichen.
9Anderungen des Designs und der
Technischen Daten ohne vorherge-
hende Bekanntgage vorbehalten.
RENSEIGNEMENTS
GENERAUX
DESCRIPTION1Levier d’embrayage
2Bouton de coupe-circuit de sécurité
“ENGINE STOP”
3Levier de frein avant
4Poignée d’accélérateur
5Bouchon du radiateur
6Bouchon de réservoir à essence
7Kickstarter
8Réservoir de carburant
9Radiateur
0Boulon de vidange du liquide de
refroidissement
qBoulon de contrôle
(niveau d’huile de transmission)
wPédale de frein arrière
eJoint de robinet
rRobinet à essence
tBouton de starter
yChaîne de transmission
uFiltre à air
iPédale de sélecteur
oFourche avant
N.B.:
9La machine que vous avez achetée
diffère peutêtre partiellement de celles
montrées sur ces photos.
9La conception et les caractéristiques
peuvent êtres changées sans préavis.
IC100000
INFORMAZIONI
GENERALI
IC110000
DESCRIZIONE
1Leva di comando della frizione
2Pulsante “ARRESTO MOTORE”
3Leva di comando del freno anteriore
4Manopola dell’acceleratore
5Tappo del radiatore
6Tappo del serbatoio del carburante
7Pedivella della messa in moto
8Serbatoio del carburante
9Radiatore
0Bullone di drenaggio del liquido
refrigerante
qBullone di controllo
(livello dell’olio della trasmissione)
wPedale di comando del freno posteriore
eGiunto della valvola
rRubinetto del carburante
tManopola dell’avviamento
yCatena di trasmissione
uFiltro dell’aria
iPedale del cambio
oForcella anteriore
NOTA:
9Il veicolo acquistato può essere leg-
germente diverso da quelli illustrati
qui sotto.
9Progetti e specifiche sono soggetti a
variazioni senza preavviso.
1
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1-9
CONTROL FUNCTIONS
GEN
INFO
EC150000
CONTROL FUNCTIONS
EC151000
“ENGINE STOP” BUTTON
The “ENGINE STOP” button 1is located on the
left handlebar. Continue pushing the “ENGINE
STOP” button till the engine comes to a stop.
EC152000
CLUTCH LEVER
The clutch lever 1is located on the left handle-
bar; it disengages or engages the clutch. Pull
the clutch lever to the handlebar to disengage
the clutch, and release the lever to engage the
clutch. The lever should be pulled rapidly and
released slowly for smooth starts.
EC153000
SHIFT PEDAL
The gear ratios of the constant-mesh 5 speed
transmission are ideally spaced. The gears can
be shifted by using the shift pedal 1on the left
side of the engine.
EC154000
KICK STARTER
Rotate the kick starter 1away from the engine.
Push the starter down lightly with your foot until
the gears engage, then kick smoothly and force-
fully to start the engine. This model has a prima-
ry kick starter so the engine can be started in
any gear if the clutch is disengaged. In normal
practices, however, shift to neutral before start-
ing.
EC155001
THROTTLE GRIP
The throttle grip 1is located on the right han-
dlebar; it accelerates or decelerates the engine.
For acceleration, turn the grip toward you; for
deceleration, turn it away from you.
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1-13
STARTING AND BREAK-IN
GEN
INFO
EC190000
STARTING AND BREAK-IN
cC
Before starting the machine, perform the
checks in the pre-operation check list.
w
Never start or run the engine in a closed
area. The exhaust fumes are poisonous;
they can cause loss of consciousness and
death in a very short time. Always operate
the machine in a well-ventilated area.
EC191001
STARTING A COLD ENGINE
1. Shift the transmission into neutral.
2. Turn the fuel cock to “ON” and full open the
starter knob (CHOKE).
3. With the throttle completely closed start the
engine by kicking the kick starter forcefully
with firm stroke.
4. Run the engine at idle or slightly higher until
it warms up: this usually takes about one or
two minutes.
5. The engine is warmed up when it responds
normally to the throttle with the starter knob
(CHOKE) turned off.
cC
Do not warm up the engine for extended peri-
ods.
EC193001
STARTING A WARM ENGINE
Do not operate the starter knob (CHOKE). Open
the throttle slightly and start the engine by kick-
ing the kick starter forcefully with firm stroke.
cC
Observe the following break-in procedures
during initial operation to ensure optimum
performance and avoid engine damage.
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