2007 YAMAHA YZ250LC oil type

INSP
ADJ
3-13
TRANSMISSION OIL REPLACEMENT
3. Check:
9Transmission oil level
EC35K002
TRANSMISSION OIL REPLACEMENT
1. Start the engine and warm it up for several
minutes and wait for five minute.
2. Place the machine on a level place and hold
it on upright position by placing the suitable
stand under the engine.
3. Place a suitable container under the engine.
Transmission oil level checking steps:
9Remove the oil check bolt 1.
9Inspect the oil level.
NOTE:
Be sure the machine is positioned straight
up when inspecting the oil level.
w
Never attempt to remove the oil check bolt
just after high speed operation. The heat-
ed oil could spout out, causing danger.
Wait until the oil cools down.
Oil flows outOil level is correct.
Oil does not flow outOil level is low.
Add transmission
oil until oil flows
out.
9Inspect the gasket (oil check bolt), replace if
damaged.
9Tighten the oil check bolt.
Recommended oil:
Yamalube 4 (10W-30) or SAE
10W-30 type SE motor oil
Oil check bolt:
10 Nm (1.0 m•kg, 7.2 ft•lb)
1P8-9-32-3a 4/28/06 10:52 AM Page 34

INSP
ADJ
3-14
PILOT AIR SCREW ADJUSTMENT
4. Remove:
9Oil drain bolt 1
9Oil filler cap 2
Drain the transmission oil.
5. Install:
9Aluminum washer
9Oil drain bolt 1
6. Fill:
9Transmission oil
Recommended oil:
Yamalube 4 (10W-30) or SAE
10W-30 type SE motor oil
Oil capacity
(periodic oil change):
0.75 L (0.66 Imp qt, 0.79 US qt)
23 Nm (2.3 m•kg, 17 ft•lb)
7. Check:
9Oil leakage
8. Check:
9Transmission oil level
9. Install:
9Oil filler cap 2
EC35L021
PILOT AIR SCREW ADJUSTMENT
1. Adjust:
9Pilot air screw 1
Adjusting steps:
9Turn in the pilot air screw until it is lightly
seated.
9Turn out the pilot air screw by the factory-set
number of turns.
NOTE:
To optimize the fuel flow at a smaller throttle
opening, each machine’s pilot air screw has
been individually set at the factory. Before
adjusting the pilot air screw, turn it in fully and
count the number of turns. Record this num-
ber as the factory-set number of turns out.
Pilot air screw:
1 turn out
*2-1/4 turns out
**1-1/4 turns out
(for reference only)
*For EUROPE
**For AUS, NZ and ZA
1P8-9-32-3a 4/28/06 10:52 AM Page 36

5-24
CHASFRONT BRAKE AND REAR BRAKE
2. Install:
9Brake hose holder 1
9Screw (brake hose holder) 2
cC
After installing the brake hose holders,
make sure the brake hose does not contact
the spring (rear shock absorber). If it does,
correct its twist.
EC5A5620
Brake fluid
1. Fill:
9Brake fluid
Until the fluid level reaches “LOWER” level
line a.
w
9Use only the designated quality brake fluid:
otherwise, the rubber seals may deterio-
rate, causing leakage and poor brake per-
formance.
9Refill with the same type of brake fluid;
mixing fluids may result in a harmful chemi-
cal reaction and lead to poor performance.
9Be careful that water does not enter the
master cylinder when refilling. Water will
significantly lower the boiling point of the
fluid and may result in vapor lock.
cC
Brake fluid may erode painted surfaces or
plastic parts. Always clean up spilled fluid
immediately.
AFront
BRear
Recommended brake fluid:
DOT #4
2 Nm (0.2 m•kg, 1.4 ft•lb)
1P8-9-32-5a 4/10/06 4:40 PM Page 48

5-64
CHASREAR SHOCK ABSORBER
EC586000
HANDLING NOTE
w
This shock absorber is provided with a
separate type tank filled with high-pressure
nitrogen gas. To prevent the danger of ex-
plosion, read and understand the following
information before handling the shock ab-
sorber.
The manufacturer can not be held respon-
sible for property damage or personal in-
jury that may result from improper han-
dling.
1. Never tamper or attempt to disassemble
the cylinder or the tank.
2. Never throw the shock absorber into an
open flame or other high heat. The shock
absorber may explode as a result of ni-
trogen gas expansion and/or damage to
the hose.
3. Be careful not to damage any part of the
gas tank. A damaged gas tank will impair
the damping performance or cause a
malfunction.
4. Take care not to scratch the contact sur-
face of the piston rod with the cylinder;
or oil could leak out.
5. Never attempt to remove the plug at the
bottom of the nitrogen gas tank. It is very
dangerous to remove the plug.
6. When scrapping the shock absorber, fol-
low the instructions on disposal.
EC587000
NOTES ON DISPOSAL (YAMAHA DEAL-
ERS ONLY)
Before disposing the shock absorber, be sure to
extract the nitrogen gas from valve 1. Wear eye
protection to prevent eye damage from escaping
gas and/or metal chips.
w
To dispose of a damaged or worn-out
shock absorber, take the unit to your
Yamaha dealer for this disposal procedure.
1P8-9-32-5d 4/5/06 5:58 PM Page 20

7-2
SETTINGTUN
That is:
9Higher temperature expands the air with its
resultant reduced density.
9Higher humidity reduces the amount of oxygen
in the air by so much of the water vapor in the
same air.
9Lower atmospheric pressure (at a high altitude)
reduces the density of the air.
EC713001
Test run
After warming up the engine equipped with the
standard type carburetor(s) and spark plug(s),
run two or three laps of the circuit and check the
smooth operation of the engine and discoloration
of spark plug(s).
åNormal
∫Over burned (too lean)
çOil fouled (too rich)
Discoloration Condition of spark plug
NormalInsulator is dry and
burnt brown.
Over burned
Insulator is whitish.
(too lean)
Oil fouled Insulator is sooty and
(too rich) wet.
A
B
C
1P8-9-32-7 4/28/06 3:47 PM Page 4

7-11
SETTINGTUN
EC71M010
Change of the heat range of spark plugs
Judging from the discoloration of spark plugs, if
they are found improper, it can be corrected by
the following two methods; changing carburetor
settings and changing the heat range of spark
plug.
9In principle, it is advisable to first use spark
plugs of standard heat range, and judging from
the discoloration of spark plugs, adjust carbure-
tor settings.
9If the calibration No. of the main jet must be
changed by ±15, it is advisable to change the
heat range of spark plugs and newly select the
proper main jet.
NOTE:
9When checking the discoloration of spark
plugs, be sure to stop the engine immediately
after a run and check.
9Avoid racing.
9When changing the heat range of spark plugs,
never attempt to change it more than ±1 rank.
9When using a spark plug other than standard,
check its heat range against the standard and
check that it is a resistance type.
9Note that even if the discoloration seems prop-
er, it may slightly vary with the spark plug
maker and oil in use.
Standard spark plugBR8EG/NGK(resistance type)
1P8-9-32-7 4/28/06 3:47 PM Page 26

7-14
REGLAGE
EINSTELLUNG
REGISTRAZIONETUN
Einstellung der Vorderradgabel
Die Einstellung der Vorderradgabel
soll entsperechend dem Gefühl des
Fahrers nach einer Testfahrt und den
Bedingungen der Strecke vorgenom-
men werden.
Die Einstellung der Vorderradgabel bein-
haltet die folgenden drei Faktoren:
1. Einstellung der Luftfedereigen-
schaften
9Änderung der Gabelölmenge
2. Einstellung der Federvorspan-
nung
9Umstellung der Feder
3. Einstellung der Dämpfungskraft
9Änderung der Einfederdämp-
fung
9Änderung der Ausfederdämp-
fung
Die Federn wirken auf die Last
ein, und die Dämpfungskraft
wirkt auf die Dämpfungsele-
ment-Bewegungsgeschwindig-
keit.
Änderungen bei der Menge und
den Eigenschaften des Gabelöls
Die Dämpfungseigenschaften in der
Nähe des Endhubes können geändert
werden, indem die Gabelölmenge
geändert wird.
dD
Die Ölmenge in Schritten von 5 cm3
(0,2 Imp oz, 0,2 US oz) erhöhen oder
verringern. Eine zu kleine Ölmenge
führt bei vollem Rückstoß zu einem
durch die Teleskopgabel produzier-
ten Geräusch, oder dazu, dass der
Fahrer an seinen Händen oder an
seinem Körper einen Druck wahr-
nimmt. Im Gegensatz dazu
führt eine zu große Ölmenge dazu,
dass die Lufteigenschaft dazu neigt,
steifer zu werden, was zu einer
Beeinträchtigung der Leistung und
der Eigenschaften führt. Die Tele-
skopgabel aus diesem Grund inner-
halb des spezifizierten Bereichs ein-
stellen.
Réglages de la fourche avant
Régler la fourche avant en fonction de
la sensation lors de la conduite ainsi
que des conditions du terrain.
Les trois réglages de la fourche avant
sont les suivants:
1. Réglage de l’amortissement pneu-
matique
9Ajuster le quantité de l’huile de
fourche.
2. Réglage de la précontrainte du res-
sort
9Changer de type de ressort.
3. Réglage de l’amortissement
9Régler la force de compression.
9Régler la force de rebond.
Le ressort a une action sur la
charge et la suspension a une
action sur la vitesse de la course
d’amortissement.
Changement de quantité et de carac-
téristiques de l’huile de fourche
Les caractéristiques d’amortissement en
fin de course peuvent être modifiées en
changeant la quantité d’huile de fourche.
fF
Ajuster la quantité d’huile par incré-
ments ou décréments de 5 cm3(0,2
Imp oz, 0,2 US oz). Avec une quantité
d’huile insuffisante, la fourche émet
un bruit au rebond maximum, ou
alors le pilote ressent une pression
sur ses mains ou son corps. Inverse-
ment, une trop grande quantité
d’huile produit une tendance au dur-
cissement de la fourche avec, comme
conséquence, une détérioration des
performances et des caractéristiques.
Voilà pourquoi il convient d’ajuster
la fourche dans la plage spécifiée.
IC722011
Registrazione della forcella anteriore
La registrazione della forcella anteriore
dovrebbe essere effettuata in base alla sen-
sazione che il guidatore ha di una corsa
effettiva e alle condizioni del circuito.
La registrazione della forcella anteriore
comprende i seguenti tre fattori:
1. Registrazione delle caratteristiche
della sospensione pneumatica
9Cambiare il quantità d’olio della
forcella.
2. Registrazione del precarico della
molla
9Cambiare la molla.
3. Registrazione della forza di smor-
zamento
9Cambiare lo smorzamento della
compressione.
9Cambiare lo smorzamento
dell’estensione.
La molla agisce sul carico e la
forza di smorzamento agisce
sulla velocità di corsa
dell’ammortizzatore.
IC723001Modifica della quantità e delle carat-
teristiche dell’olio per forcella
Le caratteristiche di smorzamento in
prossimità della corsa finale possono
essere modificate modificando la quan-
tità d’olio per forcella.
iI
Regolare la quantità d’olio in incre-
menti o decrementi di 5 cm3(0,2 Imp
oz, 0,2 US oz). Una quantità d’olio
insufficiente fa sì che la forcella ante-
riore produca un rumore in piena
estensione o che il guidatore avverta
una certa pressione sulle mani o sul
corpo. Con una quantità d'olio ecces-
siva, invece, le caratteristiche aerodi-
namiche tenderanno ad essere più
rigide, peggiorando prestazioni e
caratteristiche. Quindi la forcella
anteriore deve essere regolata entro la
gamma specificata.
Quantité d’huile stan-
dard :
340 cm
3(12,0 Imp oz,
11,5 US oz)
*345 cm
3(12,1 Imp oz,
11,7 US oz)
Etendue de réglage:
300~380 cm
3
(10,6~13,4 Imp oz,
10,1~12,8 US oz)
ACaractéristiques de ressort pneumatique
en relation avec le changement de quanti-
té d’huile
BCharge
CCourse
1Quantité d’huile max.
2Quantité d’huile standard
3Quantité d’huile min.
Standard-Ölmenge:
340 cm3(12,0 Imp oz,
11,5 US oz)
*345 cm
3(12,1 Imp oz,
11,7 US oz)
Einstellumfang:
300~380 cm
3
(10,6~13,4 Imp oz,
10,1~12,8 US oz)
Quantità d’olio standard:
340 cm3(12,0 Imp oz,
11,5 US oz)
*345 cm
3(12,1 Imp oz,
11,7 US oz)
Gamma di regolazione:
300~380 cm
3
(10,6~13,4 Imp oz,
10,1~12,8 US oz)
ALuftfedereigenschaften im Verhältnis
zur Änderung der Ölmenge
BBelastung
CFederweg
1Max. Ölmenge
2Standard-Ölmenge
3Min. Ölmenge
ACaratteristiche della sospensione pneu-
matica in relazione alla variazione della
quantità d’olio
BCarico
CCorsa
1Quantità d’olio max.
2Quantità d’olio normale
3Quantità d’olio min.
* Pour EUROPE
* Für EUROPA
* Per EUROPA
1P8-9-32-7 4/28/06 3:48 PM Page 33