oil change YAMAHA YZ250F 2001 Manuale duso (in Italian)

6. GASOLINE CAN CAUSE INJURY.
If you should swallow some gasoline,
inhale excess gasoline vapors, or
allow any gasoline to get into your
eyes, contact a doctor immediately. If
any gasoline spills onto your skin or
clothing, immediately wash skin areas
with soap and water, and change your
clothes.
7. ONLY OPERATE THE MACHINE IN AN
AREA WITH ADEQUATE VENTILA-
TION.
Never start the engine or let it run for
any length of time in an enclosed area.
Exhaust fumes are poisonous. These
fumes contain carbon monoxide,
which by itself is odorless and color-
less. Carbon monoxide is a dangerous
gas which can cause unconscious-
ness or can be lethal.
8. PARK THE MACHINE CAREFULLY;
TURN OFF THE ENGINE.
Always turn off the engine if you are
going to leave the machine. Do not
park the machine on a slope or soft
ground as it may fall over.
9. THE ENGINE EXHAUST PIPE, MUF-
FLER, AND OIL TANK WILL BE VERY
HOT AFTER THE ENGINE HAS BEEN
RUN.
Be careful not to touch them or to
allow any clothing item to contact
them during inspection or repair.
10. PROPERLY SECURE THE MACHINE
BEFORE TRANSPORTING IT.
When transporting the machine in
another vehicle, always be sure it is
properly secured and in an upright
position and that the fuel cock is in
the “OFF” position. Otherwise, fuel
may leak out of the carburetor or fuel
tank.

GEN
INFO

1 - 1
DESCRIPTION
EC100000
GENERAL INFORMATION
EC110000
DESCRIPTION
1
Clutch lever
2
Decompression lever
3
Front brake lever
4
Throttle grip
5
Radiator cap
6
Fuel tank cap
7
Oil tank cap
8
Engine stop switch
9
Kickstarter crank
0
Fuel tank
A
Radiator
B
Coolant drain bolt
C
Rear brake pedal
D
Valve joint
E
Fuel cock
F
Cold starter knob
G
Hot starter knob (red)
H
Drive chain
I
Air filter
J
Shift pedal
K
Front fork
NOTE:

l
The machine you have purchased may differ
slightly from those shown in the following.
l
Designs and specifications are subject to
change without notice.
1

SPEC

2 - 2
GENERAL SPECIFICATIONS
Oil capacity:
Engine oil
Periodic oil change 1.5 L (1.32 Imp qt, 1.59 US qt)
With oil filter replacement 1.6 L (1.41 Imp qt, 1.69 US qt)
Total amount 1.7 L (1.50 Imp qt, 1.80 US qt)
Coolant capacity (including all routes): 0.9 L (0.79 Imp qt, 0.95 US qt)
Air filter: Wet type element
Fuel:
Type Premium unleaded fuel with a research octane
number of 95 or higher. (Except for AUS)
Unleaded fuel only (For AUS)
Tank capacity 8.0 L (1.76 Imp gal, 2.11 US gal)
Carburetor:
Type FCR-MX37
Manufacturer KEIHIN
Spark plug:
Type/manufacturer CR8E/NGK
U24ESR-N/DENSO
Gap 0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
Clutch type: Wet, multiple-disc
Transmission:
Primary reduction system Gear
Primary reduction ratio 57/17 (3.353)
Secondary reduction system Chain drive
Secondary reduction ratio 48/13 (3.692)
Transmission type Constant mesh, 5-speed
Operation Left foot operation
Gear ratio: 1st 30/14 (2.143)
2nd 28/16 (1.750)
3rd 29/20 (1.450)
4th 27/22 (1.227)
5th 25/24 (1.042)
Chassis:
Frame type Semi double cradle
Caster angle 27.1˚
Trail 117.4 mm (4.62 in)
Tire:
Type With tube
Size (front) 80/100-21 51M (For USA, CDN, ZA, AUS, NZ
and F)
80/100-21 MT320 (For EUROPE except F)
Size (rear) 100/90-19 57M (For USA, CDN, ZA, AUS, NZ
and F)
100/90-19 MT320 (For EUROPE except F)
Tire pressure (front and rear) 100 kPa (1.0 kg/cm
2

, 15 psi)

2

3 - 1
INSP
ADJ

MAINTENANCE INTERVALS
EC300000
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS
The following schedule is intended as a general guide to maintenance and lubrication. Bear in mind
that such factors as weather, terrain, geographical location, and individual usage will alter the
required maintenance and lubrication intervals. If you are a doubt as to what intervals to follow in
maintaining and lubricating your machine, consult your Yamaha dealer.
ItemAfter
break-inEvery
race
Every
third
(or
500 km)Every
fifth
(or
1,000 km)
As re-
quiredRemarks
ENGINE OIL
Replace
Inspect
c

cc

c
OIL FILTER ELEMENT, OIL STRAINER
Clean
c

VALVES
Check the valve clearances.
Inspect
Replace
c

c

c

c
The engine must be cold.
Check the valve seats
and valve stems for wear.
VALVE SPRINGS
Inspect
Replace
c

c
Check the free length and
the tilt.
VALVE LIFTERS
Inspect
Replace
c

c
Check for scratches and
wear.
CAMSHAFTS
Inspect
Replace
c

c
Inspect the camshaft sur-
face.
TIMING CHAIN SPROCKETS, TIMING
CHAIN
Inspect
Replace
c

c
Check for wear on the
teeth and for damage.
PISTON
Inspect
Clean
Replace
c

c

c

c
Inspect crack
Remove carbon
PISTON RING
Inspect
Replace
c

c

c
Check ring end gap
PISTON PIN
Inspect
Replace
c

c

CYLINDER HEAD
Inspect and clean
c
Remove carbon
Change gasket
CYLINDER
Inspect and clean
Replace
c

c
Inspect score marks
Inspect wear
CLUTCH
Inspect and adjust
Replace
c

c

c
Inspect housing, friction
plate, clutch plate and
spring
TRANSMISSION
Inspect
Replace bearing
c

c



3

3 - 16
INSP
ADJ
ENGINE OIL REPLACEMENT
4. Remove:
lOil tank cap 1
lFrame oil drain bolt 2
lCrankcase oil drain bolt 3
lOil filter element drain bolt 4
Drain the crankcase and oil tank
(frame) of its oil.
5. Remove:
lLower engine bracket
lOil hose clamp 1
lBolt (oil hose) 2
lOil hose 3
lOil strainer (frame) 4
6. Inspect:
lOil strainer (frame)
lClogged ® Blow.
7. If the oil filter is to be replaced during this
oil change, remove the following parts
and reinstall them.
Replacement steps:
lRemove the oil filter element cover 1 and
oil filter element 2.
lCheck the O-rings 3, if cracked or dam-
aged, replace them with a new one.
lInstall the oil filter element and oil filter ele-
ment cover.
T R..
Oil filter element cover:
10 Nm (1.0 m • kg, 7.2 ft • lb)

3 - 17
INSP
ADJ
ENGINE OIL REPLACEMENT
8. Install:
lCopper washer 1
lOil strainer (frame) 2
lOil hose 3
lBolt (oil hose) 4
lOil hose clamp 5
lLower engine bracket
9. Install:
lCopper washer
lOil filter element drain bolt
lCrankcase oil drain bolt
lFrame oil drain bolt
10. Fill:
lEngine oil
11. Check:
lOil leakage
12. Install:
lOil tank cap
13. Check:
lEngine oil level
Oil quantity:
Total amount:
1.7 L (1.50 Imp qt, 1.80 US qt)
Periodic oil change:
1.5 L (1.32 Imp qt, 1.59 US qt)
With oil filter replacement:
1.6 L (1.41 Imp qt, 1.69 US qt)
T R..90 Nm (9.0 m · kg, 65 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
T R..2 Nm (0.2 m · kg, 1.4 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
T R..20 Nm (2.0 m · kg, 14 ft · lb)
T R..23 Nm (2.3 m · kg, 17 ft · lb)

ENG
4 - 51
EMBRAYAGE
KUPPLUNG
FRIZIONE
Reibscheiben
1. Messen:
lReibscheibenstärke
Unvorschriftsmäßig ® Die
Reibscheiben im Satz
erneuern.
Die Reibscheiben an vier
Stellen messen.
Kupplungsscheiben
1. Messen:
lVerzug der Kupplungsschei-
ben
Unvorschriftsmäßig ®
Kupplungsscheiben im Satz
erneuern.
Eine Richtplatte 1 und eine
Fühlerlehre 2 verwenden.
Reibscheibenstärke
2,9–3,1 mm
2,7 mm
Verzugsgrenze
0,1 mm
Druckhebel
1. Kontrollieren:
lDruckhebelwelle 1
Verschleiß/Beschädigung ®
Erneuern.
Druckstangen
1. Kontrollieren:
lDruckstange 1 1
lLager 2
lUnterlegscheibe 3
lDruckstange 2 4
lKugel 5
Verschleiß/Beschädigung/
Verbiegung ® Erneuern. Disque de friction
1. Mesurer:
lEpaisseur de disque de friction
Hors-spécification ® Changer
tous les disques de friction.
Mesurer chaque disque en qua-
tre endroits.
Disque d’embrayage
1. Mesurer:
lVoile de disque d’embrayage
Hors spécification ® Rampla-
cer tous les disques
d’embrayage.
Utiliser une plaque à surfacer
1 et une jauge d’épaisseur 2.
Epaisseur de disque de
friction:
2,9 à 3,1 mm
(0,114 à 0,122 in)
: 2,7 mm
(0,106 in)
Limite de déformation:
0,1 mm (0,004 in)
Levier de poussée
1. Contrôler:
lArbre de levier de poussée 1
Usure/endommagement ®
Ramplacer.
Tige de poussée
1. Contrôler:
lTige de poussée 1 1
lRoulement 2
lRondelle 3
lTige de poussée 2 4
lBille 5
Usure/endommagement/défor-
mation ® Ramplacer.Disco conduttore
1. Misurare:
lSpessore del disco conduttore
Fuori specifica ® Sostituire in
blocco il disco conduttore.
Misurare tutti i quattro punti.
Disco condotto
1. Misurare:
lDeformazione del disco con-
dotto
Fuori specifica ® Sostituire in
blocco il disco condotto.
Utilizzare un piano di riscon-
tro 1 ed uno spessimetro 2.
Spessore del disco condut-
tore:
2,9 ~ 3,1 mm
(0,114 ~ 0,122 in)
: 2,7 mm
(0,106 in)
Limite di deformazione:
0,1 mm (0,004 in)
Alberino della leva spingente
1. Ispezionare:
lAlberino della leva spingente
1
Usura/danno ® Sostituire.
Asta di punteria
1. Ispezionare:
lAsta di punteria 1 1
lCuscinetto 2
lRondella 3
lAsta di punteria 2 4
lSfera 5
Usura/danno/flessioni ® Sosti-
tuire.

4 - 57
ENG
OIL FILTER ELEMENT, WATER PUMP AND RIGHT
CRANKCASE COVER
REMOVAL POINTS
Impeller shaft
1. Remove:
lImpeller 1
lWasher 2
lImpeller shaft 3
NOTE:
Hold the impeller shaft on its width across the
flats a with spanners, etc. and remove the
impeller.
EC4G3210
Oil seal
NOTE:
It is not necessary to disassemble the water
pump, unless there is an abnormality such as
excessive change in coolant level, discolora-
tion of coolant, or milky transmission oil.
1. Remove:
lBearing 1
2. Remove:
lOil seal 1
INSPECTION
Oil delivery pipe
1. Inspect:
lOil delivery pipe 1
Bend/damage ® Replace.
Clogged ® Blow.

5 - 3
CHAS

ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD
RUOTA ANTERIORE E RUOTA POSTERIORE
AUSBAU
Hinterrad
1. Demontieren:
l
Rad
1

HINWEIS:

Das Rad nach vorne stoßen und die
Antriebskette
2
abnehmen.
Radlager (nach Bedarf)
1. Demontieren:
l
Lager
1

HINWEIS:

Die Lager mit einem Lageraustreiber
2
ausbauen.
PRÜFUNG
Rad
1. Messen:
l
Felgenschlag
Unvorschriftsmäßig
®

Instand setzen/Erneuern.
Max. Felgenschlag
Höhenschlag
1
:
2,0 mm
Seitenschlag
2
:
2,0 mm
2. Kontrollieren:
l
Lager
Den inneren Laufring mit
dem Finger drehen.
Schwergängigkeit/Freßspu-
ren
®
Erneuern.
HINWEIS:

Lager, Dichtringe und Hülse im Satz
erneuern.
POINTS DE DEPOSE
Roue arrière
1. Déposer:
l
Roue
1

N.B.:

Pousser la roue vers l’avant et déposer la
chaîne de transmission
2
.
Roulement de roue (si nécessaire)
1. Déposer:
l
Roulement
1
N.B.:
Déposer le roulement en utilisant un
arrache-roulement courant 2.
CONTROLE
Roue
1. Mesure:
lVoile de roue
Hors limite ® Réparer/rempla-
cer.
Limite de voile de la roue:
Radial 1: 2,0 mm
(0,08 in)
Latéral 2: 2,0 mm
(0,08 in)
2. Contrôler:
lRoulement
Faire tourner la bague inté-
rieure avec le doigt.
Point dur/grippage ® Rempla-
cer.
N.B.:
Changer à la fois les roulements, la
bague d’étanchéité et la collerette de
roue.PUNTI DI RIMOZIONE
Ruota posteriore
1. Rimuovere:
lRuota 1
NOTA:
Spingere la ruota in avanti e rimuovere
la catena di trasmissione 2.
Cuscinetto della ruota (se necessario)
1. Rimuovere:
lCuscinetto 1
NOTA:
Rimuovere il cuscinetto impiegando un
estrattore per cuscinetti 2.
ISPEZIONE
Ruota
1. Misurare:
lScentratura
Fuori limite ® Riparare/sosti-
tuire.
Limite di disassamento
ruota:
Radiale 1: 2,0 mm
(0,08 in)
Laterale 2: 2,0 mm
(0,08 in)
2. Ispezionare:
lCuscinetto
Far ruotare l’anello interno con
un dito.
Punti rugosi/grippaggio ®
Sostituire.
NOTA:
Sostituire in blocco i cuscinetti, il parao-
lio ed il collarino della ruota.

5 - 4
CHAS
ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD
RUOTA ANTERIORE E RUOTA POSTERIORE
Radachse
1. Messen:
lRadachsschlag
Unvorschriftsmäßig ®
Erneuern.
Die Meßuhr 1 verwenden.
HINWEIS:
Der Radachsschlag entspricht der
Hälfte der Meßuhranzeige.
WARNUNG
Nie versuchen, eine verbogene
Achse zu richten.
Max. Radachsschlag
0,5 mm
Bremsscheibe
1. Messen:
lBremsscheibenschlag (nur
Hinterrad-Bremsscheibe)
Die Meßuhr 1 verwenden.
Unvorschriftsmäßig ® Fel-
genschlag prüfen.
Falls im Sollbereich, die
Bremsscheibe erneuern.
2. Messen:
lBremsscheibenstärke a
Unvorschriftsmäßig ®
Erneuern.
Max. Bremsscheiben-
verzug
0,15 mm
Bremsscheiben-Min-
deststärke
Vorn
3,0 mm
2,5 mm
Hinten
4,0 mm
3,5 mm
Axe de roue
1. Mesurer:
lDéformation de l’axe de roue
Hors-spécification ® Rempla-
cer.
Utiliser le comparateur 1.
N.B.:
La valeur de déformation est égale à la
moitié de la lecture du comparateur.
AVERTISSEMENT
Ne jamais tenter de redresser un axe
tordu.
Limite de déformation de
l’axe de roue:
0,5 mm (0,020 in)
Disque de frein
1. Mesurer:
lDéflexion de disque de frein
(disque de frein arrière unique-
ment)
Utiliser le comparateur 1.
Hors spécification ® Exami-
ner le voile de roue.
Si le voile de la roue est nor-
mal, changer le disque de frein.
2. Mesurer:
lEpaisseur de disque de frein a
Hors limite ® Remplacer.
Limite de déflexion de dis-
que:
:0,15 mm
(0,006 in)
Limite d’usure de disque:
Avant:
3,0 mm (0,12 in)
: 2,5 mm
(0,10 in)
Arrière:
4,0 mm (0,16 in)
: 3,5 mm
(0,14 in)
Asse della ruota
1. Misurare:
lDeformazioni asse della ruota
Fuori specifica ® Regolare.
Utilizzare un comparatore 1.
NOTA:
Il valore di deformazione corrisponde
alla metà del valore indicato dal compa-
ratore.
AVVERTENZA
Non tentare di raddrizzare un asse
deformato.
Limite di deformazione
dell’asse della ruota:
0,5 mm (0,020 in)
Disco freno
1. Misurare:
lDeflessione disco del freno
(solo disco del freno poste-
riore)
Utilizzare un comparatore 1.
Fuori specifica ® Ispezionare
il disassamento della ruota.
Se il disassamento è in buone
condizioni, sostituire il disco
del freno.
2. Misurare:
lSpessore del disco del freno a
Fuori limite ® Sostituire.
Limite di deflessione del
disco freno:
Posteriore:
: 0,15 mm
(0,006 in)
Spessore del disco freno:
Anteriore:
3,0 mm (0,12 in)
: 2,5 mm
(0,10 in)
Posteriore:
4,0 mm (0,16 in)
: 3,5 mm
(0,14 in)