radiator cap YAMAHA YZ250F 2003 Notices Demploi (in French)

KAPITEL 4
MOTOR
SITZBANK, KRAFTSTOFFTANK
UND SEITENABDECKUNGEN .. 4-1
KRÜMMER
UND SCHALLDÄMPFER ........... 4-3
KÜHLER ..................................... 4-5
VERGASER ................................ 4-8
NOCKENWELLE ...................... 4-21
ZYLINDERKOPF ...................... 4-30
VENTILE
UND VENTILFEDERN ............. 4-33
ZYLINDER UND KOLBEN ....... 4-42
KUPPLUNG .............................. 4-49
ÖLFILTEREINSATZ, WASSER-
PUMPE UND RECHTE KURBEL-
WELLENABDECKUNG ........... 4-56
AUSGLEICHSWELLE .............. 4-63
ÖLPUMPE ................................ 4-66
KICKSTARTER UND KICKSTAR-
TERWELLE .............................. 4-71
CDI-SCHWUNGRADMAGNETZÜN-
DER .......................................... 4-78
MOTOR DEMONTIEREN ......... 4-82
KURBELGEHÄUSE UND KURBEL-
WELLE ..................................... 4-87
GETRIEBE, SCHALTWALZE UND
SCHALTGABELN .................... 4-96
KAPITEL 5
FAHRWERK
VORDER- UND HINTERRAD .... 5-1
VORDER-
UND HINTERRADBREMSE .... 5-10
TELESKOPGABEL .................. 5-26
LENKER ................................... 5-39
LENKKOPF .............................. 5-45
SCHWINGE .............................. 5-50
FEDERBEIN ............................. 5-58
CHAPITRE 4
MOTEUR
SELLE, RESERVOIR
DE CARBURANT ET CACHES
LATERAUX .................................... 4-1
TUYAU D’ECHAPPEMENT
ET SILENCIEUX ........................... 4-3
RADIATEUR .................................. 4-5
CARBURATEUR ........................... 4-8
ARBRES A CAMES ..................... 4-21
CULASSE ...................................... 4-30
SOUPAPES ET
RESSORTS DE SOUPAPE ......... 4-33
CYLINDRE ET PISTON ............. 4-42
EMBRAYAGE .............................. 4-49
ELEMENT DE FILTRE
A HUILE, POMPE A EAU ET
DEMI-CARTER DROIT ............. 4-56
BALANCIER ................................ 4-63
POMPE A HUILE ........................ 4-66
ARBRE DE KICK
ET ARBRE DE SELECTEUR .... 4-71
VOLANT MAGNETIQUE
CDI ................................................. 4-78
DEPOSE DU MOTEUR .............. 4-82
CARTER ET VILEBREQUIN .... 4-87
BOITE A VITESSES,
TAMBOUR ET FOURCHETTES
DE SELECTION .......................... 4-96
CHAPITRE 5
PARTIE CYCLE
ROUE AVANT
ET ROUE ARRIERE ..................... 5-1
FREIN AVANT ET FREIN
ARRIERE ...................................... 5-10
FOURCHE AVANT ..................... 5-26
GUIDON ........................................ 5-39
DIRECTION ................................. 5-45
BRAS OSCILLANT ..................... 5-50
AMORTISSEUR ARRIERE ....... 5-58
CAPITOLO 4
MOTORE
SELLA, SERBATOIO
CARBURANTE
E CARENATURA LATERALE ... 4-1
TUBO DI SCARICO
E SILENZIATORE ........................ 4-3
RADIATORE .................................. 4-5
CARBURATORE ........................... 4-8
ALBERI A CAMME .................... 4-21
TESTATA DEL CILINDRO ....... 4-30
VALVOLE
E MOLLE VALVOLE ................. 4-33
CILINDRO E PISTONE .............. 4-42
FRIZIONE ..................................... 4-49
ELEMENTO FILTRANTE
DELL’OLIO, POMPA
DELL’ACQUA E COPERCHIO
CARTER DESTRO ...................... 4-56
BILANCIERE ............................... 4-63
POMPA DELL’OLIO .................. 4-66
ALBERO PEDALE
E ALBERO DEL CAMBIO ......... 4-71
MAGNETE CDI ........................... 4-78
RIMOZIONE DEL MOTORE .... 4-82
CARTER E ALBERO
MOTORE ...................................... 4-87
TRASMISSIONE, CAMMA DEL
CAMBIO E FORCELLA
DEL CAMBIO .............................. 4-96
CAPITOLO 5
PARTE CICLISTICA
RUOTA ANTERIORE E RUOTA
POSTERIORE ................................ 5-1
FRENO ANTERIORE E
POSTERIORE .............................. 5-10
FORCELLA ANTERIORE ......... 5-26
MANUBRIO .................................. 5-39
STERZO ........................................ 5-45
FORCELLONE
OSCILLANTE .............................. 5-50
AMMORTIZZATORE
POSTERIORE .............................. 5-58

GEN
INFO
1 - 1
DESCRIPTION
EC100000
GENERAL INFORMATION
EC110000
DESCRIPTION
1Clutch lever
2Hot starter lever
3Front brake lever
4Throttle grip
5Radiator cap
6Fuel tank cap
7Engine stop switch
8Kickstarter crank
9Fuel tank
0Radiator
ACoolant drain bolt
BRear brake pedal
CValve joint
DFuel cock
ECold starter knob
FDrive chain
GAir filter
HShift pedal
IDipstick
JFront forkNOTE:
The machine you have purchased may differ
slightly from those shown in the following.
Designs and specifications are subject to
change without notice.

GEN
INFO
1 - 7
SPECIAL TOOLS
SPECIAL TOOLS
The proper special tools are necessary for complete and accurate tune-up and assembly. Using the
correct special tool will help prevent damage caused by the use of improper tools or improvised
techniques. The shape and part number used for the special tool differ by country, so two types are
provided. Refer to the list provided to avoid errors when placing an order.
NOTE:
For U.S.A. and Canada, use part number starting with “YM-”, “YU-” or “ACC-”.
For others, use part number starting with “90890-”.
Part number Tool name/How to use Illustration
YU-1135-A, 90890-01135 Crankcase separating tool
These tool is used to remove the crankshaft from
either case.YU-1135-A 90890-01135
YM-1189, 90890-01189 Flywheel puller
This tool is used to remove the flywheel magneto.YM-1189 90890-01189
YU-1235, 90890-01235 Rotor holding tool
This tool is used when loosening or tightening the fly-
wheel magneto securing nut.YU-1235 90890-01235
YU-3097, 90890-01252
YU-1256Dial gauge and stand
Stand
These tools are used to check each part for runout or
bent.YU-3097
YU-125690890-01252
YU-90050, 90890-01274
YU-90050, 90890-01275
YU-91044, 90890-04081
YU-90063, 90890-01278Crankshaft installing tool
Crankshaft installing pot
Crankshaft installing bolt
Spacer (crankshaft installer)
Adapter (M12)
These tools are used to install the crankshaft.YU-90050
YU-90063
YU-9104490890-01274
90890-01275
90890-01278
90890-04081
YU-1304, 90890-01304 Piston pin puller set
This tool is used to remove the piston pin.YU-1304 90890-01304
YU-24460-01, 90890-01325
YU-33984, 90890-01352Radiator cap tester
Radiator cap tester adapter
These tools are used for checking the cooling sys-
tem.YU-24460-01
YU-3398490890-01325
90890-01352

SPEC

2 - 9
MAINTENANCE SPECIFICATIONS
Lubrication system:
Oil filter type Wire mesh type ----
Oil pump type Trochoid type ----
Tip clearance 0.12 mm or less
(0.0047 in or less)0.20 mm
(0.008 in)
Side clearance 0.09 ~ 0.17 mm
(0.0035 ~ 0.0067 in)0.24 mm
(0.009 in)
Housing and rotor clearance 0.03 ~ 0.10 mm
(0.0012 ~ 0.0039 in)0.17 mm
(0.0067 in)
Cooling:
Radiator core size
Width 107.8 mm (4.2 in) ----
Height 220 mm (8.7 in) ----
Thickness 32 mm (1.26 in) ----
Radiator cap opening pressure110 kPa (1.1 kg/cm
2

, 15.6 psi)----
Radiator capacity (total) 0.56 L (0.49 Imp qt, 0.59 US qt) ----
Water pump
Type Single-suction centrifugal pump ----Item Standard Limit

SPEC

2 - 10
MAINTENANCE SPECIFICATIONS
Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Spark plug M10S
×
1.0 1 13 1.3 9.4
Camshaft cap M6
×
1.0 10 10 1.0 7.2
Cylinder head blind plug screw M12
×
1.0 1 37 3.7 27
Cylinder head (stud bolt) M6
×
1.0 2 7 0.7 5.1
(stud bolt) M8
×
1.25 1 15 1.5 11
(bolt) M9
×
1.25 4 38 3.8 27
(nut) M6
×
1.0 2 10 1.0 7.2
Cylinder head cover M6
×
1.0 2 10 1.0 7.2
Cylinder M6
×
1.0 1 10 1.0 7.2
Balancer weight M6
×
1.0 2 10 1.0 7.2
Balancer shaft driven gear M14
×
1.0 1 50 5.0 36
Timing chain guide (intake side) M6
×
1.0 2 10 1.0 7.2
Timing chain tensioner M6
×
1.0 2 10 1.0 7.2
Timing chain tensioner cap bolt M6
×
1.0 1 7 0.7 5.1
Impeller M8
×
1.25 1 14 1.4 10
Radiator hose clamp M6
×
1.0 8 2 0.2 1.4
Coolant drain bolt M6
×
1.0 1 10 1.0 7.2
Water pump housing M6
×
1.0 4 10 1.0 7.2
Radiator M6
×
1.0 6 10 1.0 7.2
Radiator guard M6
×
1.0 2 10 1.0 7.2
Radiator pipe M6
×
1.0 1 10 1.0 7.2
Oil pump cover M4
×
0.7 1 2 0.2 1.4
Oil pump M6
×
1.0 3 10 1.0 7.2
Oil filter element drain bolt M6
×
1.0 1 10 1.0 7.2
Oil filter element cover M6
×
1.0 2 10 1.0 7.2
Oil strainer M6
×
1.0 2 10 1.0 7.2
Oil delivery pipe 1 (M10) M10
×
1.25 1 20 2.0 14
(M8) M8
×
1.25 2 18 1.8 13
Oil hose M6
×
1.0 2 10 1.0 7.2
Oil hose clamp—2 2 0.2 1.4
Oil strainer and frame M14
×
1.5 1 70 7.0 50
Carburetor joint clamp M4
×
0.7 2 3 0.3 2.2
Air filter joint clamp M6
× 1.0 1 3 0.3 2.2
Throttle cable cover M5 × 0.8 2 4 0.4 2.9
Hot starter plunger M12 × 1.0 1 2 0.2 1.4
Air filter case M6 × 1.0 2 8 0.8 5.8
Air filter joint and air filter case M5 × 0.8 1 4 0.4 2.9
Air filter element M6 × 1.0 1 2 0.2 1.4
Exhaust pipe (nut) M8 × 1.25 1 13 1.3 9.4
(bolt) M8 × 1.25 1 24 2.4 17
Exhaust pipe protector M6 × 1.0 3 10 1.0 7.2

SPEC
2 - 9
SPECIFICHE DI MANUTENZIONE
Sistema di lubrificazione:
Tipo di filtro Tipo a maglia metallica ----
Tipo di pompa dell’olio Tipo trocoidale ----
Gioco della punta 0,12 mm o inferiore
(0,0047 in o inferiore)0,20 mm
(0,008 in)
Gioco laterale 0,09 ~ 0,17 mm
(0,0035 ~ 0,0067 in)0,24 mm
(0,009 in)
Gioco alloggiamento e rotore 0,03 ~ 0,10 mm
(0,0012 ~ 0,0039 in)0,17 mm
(0,0067 in)
Raffreddamento:
Dimensioni massa radiante
Larghezza 107,8 mm (4,2 in) ----
Altezza 220 mm (8,7 in) ----
Spessore 32 mm (1,26 in) ----
Pressione di apertura tappo radiatore110 kPa (1,1 kg/cm
2, 15,6 psi)----
Capacità del radiatore (totale) 0,56 L (0,49 Imp qt, 0,59 US qt) ----
Pompa dell’acqua
Tipo Pompa centrifuga ad aspirazione
singola---- Elemento Standard Limite

SPEC
2 - 10
SPECIFICHE DI MANUTENZIONE
Elemento da serrareDimensioni
della filettaturaQuantitàCoppia di serraggio
Nm m·kg ft·lb
Candela d’accensione M10S × 1,0 1 13 1,3 9,4
Cappello dell’albero a camme M6 × 1,0 10 10 1,0 7,2
Tappo a vite testata del cilindro M12 × 1,0 1 37 3,7 27
Testata del cilindro (prigioniero) M6 × 1,0 2 7 0,7 5,1
(prigioniero) M8 × 1,25 1 15 1,5 11
(bullone) M9 × 1,25 4 38 3,8 27
(dado) M6 × 1,0 2 10 1,0 7,2
Coperchio testata del cilindro M6 × 1,0 2 10 1,0 7,2
Cilindro M6 × 1,0 1 10 1,0 7,2
Peso bilanciere M6 × 1,0 2 10 1,0 7,2
Ingranaggio condotto dell’albero di equilibratura M14 × 1,0 1 50 5,0 36
Guida catena di distribuzione (lato aspirazione) M6 × 1,0 2 10 1,0 7,2
Tenditore catena di distribuzione M6 × 1,0 2 10 1,0 7,2
Vite senza dado del tenditore della catena di
distribuzioneM6 × 1,0 1 7 0,7 5,1
Rotore M8 × 1,25 1 14 1,4 10
Tubo flessibile radiatore M6 × 1,0 8 2 0,2 1,4
Bullone di scarico del refrigerante M6 × 1,0 1 10 1,0 7,2
Alloggiamento della pompa dell’acqua M6 × 1,0 4 10 1,0 7,2
Radiatore M6 × 1,0 6 10 1,0 7,2
Riparo del radiatore M6 × 1,0 2 10 1,0 7,2
Tubazione del radiatore M6 × 1,0 1 10 1,0 7,2
Coperchio pompa dell’olio M4 × 0,7 1 2 0,2 1,4
Pompa dell’olio M6 × 1,0 3 10 1,0 7,2
Bullone di scarico elemento filtro dell’olio M6 × 1,0 1 10 1,0 7,2
Coperchio filtro dell’olio M6 × 1,0 2 10 1,0 7,2
Filtro olio M6 × 1,0 2 10 1,0 7,2
Tubazione alimentazione olio 1 (M10) M10 × 1,25 1 20 2,0 14
(M8) M8 × 1,25 2 18 1,8 13
Tubo flessibile dell’olio M6 × 1,0 2 10 1,0 7,2
Fascetta fermatubo dell’olio—2 2 0,2 1,4
Filtro dell’olio e telaio M14 × 1,5 1 70 7,0 50
Fascetta giunto carburatore M4 × 0,7 2 3 0,3 2,2
Fascetta giunto filtro dell’aria M6 × 1,0 1 3 0,3 2,2
Coperchio cavo dell’acceleratore M5 × 0,8 2 4 0,4 2,9
Stantuffo dell’avviamento a caldo M12 × 1,0 1 2 0,2 1,4
Scatola del filtro dell’aria M6 × 1,0 2 8 0,8 5,8
Giunto filtro dell’olio e contenitore filtro dell’aria M5 × 0,8 1 4 0,4 2,9
Filtro dell’aria M6 × 1,0 1 2 0,2 1,4
Tubo di scarico (dado) M8 × 1,25 1 13 1,3 9,4
(bullone) M8 × 1,25 1 24 2,4 17
Protezione tubo di scarico M6 × 1,0 3 10 1,0 7,2
Marmitta di scarico M8 × 1,25 2 35 3,5 25
Morsetto marmitta di scarico M8 × 1,25 1 20 2,0 14

3 - 2
INSP
ADJ
MAINTENANCE INTERVALS
SHIFT FORK, SHIFT CAM, GUIDE BAR
Inspect
● Inspect wear
ROTOR NUT
Retighten
● ●
EXHAUST PIPE, SILENCER, PRO-
TECTOR
Inspect and retighten
Clean
Replace
● ●
●
● * Whichever comes first
CRANK
Inspect and clean
● ●
CARBURETOR
Inspect, adjust and clean
● ● When using a high-pres-
sure washer, make sure
that water does not enter
the accelerator pump.
SPARK PLUG
Inspect and clean
Replace
● ●
●
DRIVE CHAIN
Lubricate, slack, alignment
Replace
● ●
● Use chain lube
Chain slack: 40 ~ 50 mm
(1.6 ~ 2.0 in)
COOLING SYSTEM
Check coolant level and leakage
Check radiator cap operation
Replace coolant
Inspect hoses
● ●
●
●
● Every two years
OUTSIDE NUTS AND BOLTS
Retighten
● ● Refer to “STARTING
AND BREAK-IN” section
in the CHAPTER 1.
AIR FILTER
Clean and lubricate
Replace
● ●
● Use foam air-filter oil or
equivalent oil
OIL FILTER
Replace
●●
OIL STRAINER (frame)
Clean
●
FRAME
Clean and inspect
● ●
FUEL TANK, COCK
Clean and inspect
● ●
BRAKES
Adjust lever position and pedal height
Lubricate pivot point
Check brake disc surface
Check fluid level and leakage
Retighten brake disc bolts, caliper
bolts, master cylinder bolts and union
bolts
Replace pads
Replace brake fluid
●
●
●
●
●
●
●
●
●
●
●
● Every one year ItemAfter
break-inEvery
race
Every
third
(or
500 km)Every
fifth
(or
1,000 km)As re-
quiredRemarks
3

INSP
ADJ
INTERVALLI DI MANUTENZIONE
TRASMISSIONE
Ispezionare
Sostituire il cuscinetto
●
●
FORCELLA DEL CAMBIO, CAMMA
DEL CAMBIO, BARRA GUIDA
Ispezionare
● Controllare il grado di usura.
DADO DEL ROTORE
Serrare
● ●
TUBO DI SCAPPAMENTO, SILENZIA-
TORE, PROTETTORE
Ispezionare e serrare
Pulire
Sostituire
● ●
●
● * A seconda di quale delle
due condizioni si verifica
per prima.
PEDIVELLA
Ispezionare e pulire
● ●
CARBURATORE
Ispezionare, regolare e pulire
● ● Quando si impiega un dispo-
sitivo di lavaggio ad alta
pressione, accertarsi che
l’acqua non penetri nella
pompa di circolazione.
Candela
Ispezionare e pulire
Sostituire
● ●
●
CATENA DI TRASMISSIONE
Lubrificare, tendere, allineare
Sostituire
● ●
● Utilizzare un lubrificante per
catene.
Allentamento della catena:
40 ~ 50 mm (1,6 ~ 2,0 in)
SISTEMA DI RAFFREDDAMENTO
Controllare il livello del refrigerante e la
presenza di eventuali perdite
Controllare l’azionamento del tappo del
radiatore
Sostituire il refrigerante
Ispezionare i flessibili
● ●
●
●
● Ogni due anni
DADI E BULLONI ESTERNI
Serrare
● ● Fare riferimento al paragrafo
“AVVIO E RODAGGIO” al
CAPITOLO 1.
FILTRO DELL’ARIA
Pulire e lubrificare
Sostituire
● ●
● Utilizzare olio per filtro
dell’aria in schiuma o un
alio equîvalente.
FILTRO DELL’OLIO
Sostituire
● ●
RETINA DELL’OLIO (telaio)
Pulire
●
TELAIO
Pulire e ispezionare
● ●
SERBATOIO DEL CARBURANTE,
RUBINETTO
Pulire e ispezionare
● ● ElementoDopo il
rodag-
gioAd ogni
gara
Ad ogni
terza gara
(o
500 km)Ad ogni
quinta
(o
1.000 km)Come
richie-
stoOsservazioni
3 - 2

3 - 4
INSP
ADJ
PRE-OPERATION INSPECTION AND MAINTENANCE
EC320000
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating
condition.
Before using this machine, check the following points.
GENERAL INSPECTION AND MAINTENANCE
Item Routine Page
CoolantCheck that coolant is filled up to the radiator cap.
Check the cooling system for leakage.P.3-5 ~ 9
FuelCheck that a fresh gasoline is filled in the fuel tank. Check the
fuel line for leakage.P.1-13
Engine oilCheck that the oil level is correct. Check the crankcase and
frame oil line for leakage.P.3-13 ~ 16
Gear shifter and clutchCheck that gears can be shifted correctly in order and that the
clutch operates smoothly.P.3-9
Throttle grip/HousingCheck that the throttle grip operation and free play are correctly
adjusted. Lubricate the throttle grip and housing, if necessary.P.3-10
Brakes Check the play of front brake and effect of front and rear brake. P.3-24 ~ 30
Drive chainCheck drive chain slack and alignment. Check that the drive
chain is lubricated properly.P.3-31 ~ 33
WheelsCheck for excessive wear and tire pressure. Check for loose
spokes and have no excessive play.P.3-41 ~ 42
SteeringCheck that the handlebar can be turned smoothly and have no
excessive play.P.3-42 ~ 43
Front forks and rear shock
absorberCheck that they operate smoothly and there is no oil leakage. P.3-33 ~ 40
Cables (wires)Check that the clutch and throttle cables move smoothly. Check
that they are not caught when the handlebars are turned or
when the front forks travel up and down.—
Exhaust pipeCheck that the exhaust pipe is tightly mounted and has no
cracks.P.4-3
Rear wheel sprocket Check that the rear wheel sprocket tightening bolt is not loose. P.3-31
Lubrication Check for smooth operation. Lubricate if necessary. P.3-44
Bolts and nuts Check the chassis and engine for loose bolts and nuts. P.1-18
Lead connectorsCheck that the CDI magneto, CDI unit, and ignition coil are con-
nected tightly.P.1-6
SettingsIs the machine set suitably for the condition of the racing course
and weather or by taking into account the results of test runs
before racing? Are inspection and maintenance completely
done?P.7-1 ~ 22