2004 YAMAHA YZ250F radiator cap

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,
WASSERPUMPE UND
RECHTE KURBEL
WELLENABDECKUNG
........... 4-56
AUSGLEICHSWELLE
.............. 4-63
ÖLPUMPE
................................ 4-66
KICKSTARTER UND
KICKSTARTERWELLE
........... 4-71
CDI-SCHWUNGRADMAGNETZÜN-
DER
.......................................... 4-78
MOTOR DEMONTIEREN
......... 4-82
KURBELGEHÄUSE UND
KURBELWELLE
...................... 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
1
Clutch lever
2
Hot starter lever
3
Front brake lever
4
Throttle grip
5
Radiator cap
6
Fuel tank cap
7
Engine stop switch
8
Kickstarter crank
9
Fuel tank
0
Radiator
A
Coolant drain bolt
B
Rear brake pedal
C
Valve joint
D
Fuel cock
E
Cold starter knob
F
Drive chain
G
Air filter
H
Shift pedal
I
Dipstick
J
Front fork
NOTE:


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 Paper 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 28 2.8 20
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 8 0.8 5.8
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 (pull) M6
×
1.0 1 4 0.4 2.9
Throttle cable (return) M12
×
1.0 1 11 1.1 8.0
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 di carta ----
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 28 2,8 20
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 8 0,8 5,8
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
Cavo dell’acceleratore (tiraggio) M6
×
1,0 1 4 0,4 2,9
Cavo dell’acceleratore (rilascio) M12
×
1,0 1 11 1,1 8,0
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

2 - 18
SPEC

CABLE ROUTING DIAGRAM
EC240000
CABLE ROUTING DIAGRAM
1
Fuel tank breather hose
2
Clutch cable
3
Oil tank breather hose
4
Hot starter cable
5
Cylinder head breather hose
6
Cable guide
7
Hose guide
8
Brake hose
9
Engine stop switch lead
0
Clamp
A
Sub-wire harness
B
Throttle position sensor lead
C
Neutral switch lead
D
Oil hose
E
CDI magneto lead
F
Radiator breather hose
G
Carburetor breather hose
H
Carburetor overflow hose
Å
Insert the end of the fuel tank
breather hose into the hole in
the steering stem cap.
ı
Pass the hot starter cable
between the cylinder head
breather hose, oil tank breather
hose and ignition coil, then on
the outside of the left engine
bracket.
Ç
Pass the clutch cable through
the cable guides.
Î
Pass the clutch cable in front of
the radiator mounting boss.
‰
Fit the brake hose into the
guides on the protector.
Ï
Fasten the neutral switch lead
and CDI magneto lead to the
cable guide with a plastic locking
tie and cut off the tie end.
Ì
Fasten the engine stop switch
lead, neutral switch lead and
CDI magneto lead.
Ó
Fasten the engine stop switch
lead and sub-wire harness at the
protecting tube for the engine
stop switch lead.
È
Fasten the sub-wire harness
and hot starter cable at the white
tape for the sub-wire harness.
Ô
Fasten the sub-wire harness.

Pass the sub-wire harness
between the engine brackets.
A
C-C
B
CC
A
D
F
C
1
2
3
4
5 6 6 78
G
H
G0
0DCB0 0 0
A 9
0
0
B
0 Ï
Ì
Ó
Ô

Ô
Ò
˜
ˆ Ø 0 E F
∏ Œ Å
ı
Ç Î Ç ‰
Â
0
È