2003 YAMAHA YZ125LC lock

7-16
TUNSETTING
EC722011
Front fork setting
The front fork setting should be made depending
on the rider’s feeling of an actual run and the cir-
cuit conditions.
The front fork setting includes the following three
factors:
1. Setting of air spring characteristics
9Change the fork oil level.
2. Setting of spring preload
9Change the spring.
9Install the adjustment washer.
3. Setting of damping force
9Change the compression damping.
9Change the rebound damping.
The spring acts on the load and the damp-
ing force acts on the cushion travel speed.
EC723001
Change in level and characteristics of fork oil
Damping characteristic near the final stroke can
be changed by changing the fork oil amount.
cC
Adjust the oil level in 5 mm (0.2 in) incre-
ments or decrements. Too low oil level
causes the front fork to produce a noise at
full rebound or the rider to feel some pres-
sure on his hands or body. Alternatively,
too high oil level will develop unexpectedly
early oil lock with the consequent shorter
front fork travel and deteriorated perfor-
mance an characteristics. Therefore, adjust
the front fork within the specified range.
åAir spring characteristics in relation to oil level
change
∫Load
çStroke
1Max. oil level
2Standard oil level
3Min. oil level
Standard oil level:
135 mm (5.31 in)
Extent of adjustment:
80~150 mm (3.15~5.91 in)
From top of outer tube with
inner tube and damper rod fully
compressed without spring.
A

7-20
TUNSETTING
EC72B000
Rear suspension setting
The rear suspension setting should be made
depending on the rider’s feeling of an actual run
and the circuit conditions.
The rear suspension setting includes the follow-
ing two factors:
1. Setting of spring preload
9Change the set length of the spring.
9Change the spring.
2. Setting of damping force
9Change the rebound damping.
9Change the compression damping.
EC72C001
Choosing set length
1. Place a stand or block under the engine to
put the rear wheel above the floor, and mea-
sure the length abetween the rear wheel
axle center and the rear fender holding bolt.
2. Remove the stand or block from the engine
and with a rider astride the seat, measure
the sunken length bbetween the rear wheel
axle center and the rear fender holding bolt.
3. Loosen the locknut 1and make adjustment
by turning the spring adjuster 2to achieve
the standard figure from the subtraction of
the length bfrom the length a.
Standard figure:
90~100 mm (3.5~3.9 in)

7-20
TUN
REGLAGE
EINSTELLUNG
REGISTRAZIONE
Einstellung der Hinterradfederung
Die Einstellung der Hinterradfederung
soll entsprechend dem Gefühl des
Fahrers nach einer Testfahrt und den
Bedingungen der Strecke vorgenom-
men werden.
Die Einstellung der Hinterradfederung
beinhaltet die folgenden beiden Fakto-
ren:
1. Einstellung der Federvorspan-
nung
9Änderung der Federlänge
9Umstellung der Feder
2. Einstellung der Dämpfungskraft
9Änderung der Ausfederdämp-
fung
9Änderung der Federfeder-
dämpfungRéglage de la suspension arrière
Effectuer le réglage de la suspension
arrière en fonction de la sensation lors
de la conduite ainsi que des conditions
de route.
Les deux réglages de la suspension
arrière sont les suivants:
1. Réglage de la précharge du ressort
9Régler la longueur du ressort.
9Changer de type de ressort.
2. Réglage de la force d’amortisse-
ment
9Régler la force de rebond.
9Régler la force de compression.
Choix de la longueur de ressort
1. Placer un support ou un bloc sous
le moteur pour surélever la roue
arrière et mesurer la longueur a
entre le centre de l’axe de roue
arrière et le boulon de fixation du
garde-boue arrière.
2. Retirer le support ou le bloc et
mesurer, avec une personne assise
correctement sur la selle, la lon-
gueur bentre le centre de l’axe de
roue arrière et le boulon de fixa-
tion du garde-boue arrière.
3. Desserrer le contre-écrou 1et
effectuer le réglage en tournant le
dispositif de réglage 2desorte à
régler à la valeur standard obtenue
en soustrayant la longueur bde la
longueur a.
Wahl der Einstellänge
1. Einen Ständer oder Block unter
den Motor stellen, um das Hinter-
rad anzuheben, und den Abstand
azwischen der Hinterradachs-
mitte und der Hinterradkotflügel-
Halteschraube messen.
2. Den Ständer oder Block vom
Motor entfernen und bei aufsit-
zendem Fahrer die eingetauchte
Tiefe bzwischen der Hinterrad-
achsmitte und der Hinterradkot-
flügel-Halteschraube messen.
3. Die Gegenmutter 1lösen, und
die Einstellung durch Drehen des
Federeinstellers 2vornehmen,
um den Standardwert von der
Subtraktion der Länge bvon der
Länge azu erhalten.IC72C001
Scelta della lunghezza registrata
1. Collocare sotto il motore un sup-
porto o un blocco per rialzare dal
suolo la parte superiore e misurare
la lunghezza afra il centro
dell’asse della ruota posteriore e il
bullone di tenuta del parafango
posteriore.
2. Togliere dal motore il supporto o il
blocco e, con un guidatore a caval-
cioni della sella, misurare la lun-
ghezza abbassata bfra il centro
dell’asse della ruota posteriore e il
bullone di tenuta del parafango
posteriore.
3. Allentare il controdado 1ed
effettuare la regolazione ruotando
il regolatore della molla 2per
ottenere la cifra normale sottraen-
do la lunghezza bdalla lunghezza
a.
IC72B000
Registrazione della sospensione
posteriore
La registrazione della sospensione
posteriore dovrebbe essere effettuata in
base alla sensazione che il guidatore ha
di una corsa effettiva e alle condizioni
del circuito.
La registrazione della sospensione poste-
riore comprende i seguenti due fattori:
1. Registrazione del precarico della
molla
9Cambiare la lunghezza registra-
ta della molla.
9Cambiare la molla.
2. Registrazione della forza di smor-
zamento
9Cambiare lo smorzamento
dell’estensione.
9Cambiare lo smorzamento della
compressione.
Valeur standard:
90~100 mm (3,5~3,9 in)
Standardwert:
90~100 mm (3,5~3,9 in)Cifra normale:
90~100 mm (3,5~3,9 in)

7-24
TUNSETTING
EC72H010
Suspension setting
9Front fork
NOTE:
9If any of the following symptoms is experienced with the standard position as the base, make reset-
ting by reference to the adjustment procedure given in the same chart.
9Before any change, set the rear shock absorber sunken length to the standard figure 90~100 mm
(3.5~3.9 in).
Section
Symptom
JumpLarge
Medium Small Check Adjust
gap gap gap
Compression damping Turn adjuster counterclockwise (about 2 clicks)
Stiff over entire to decrease damping.
range111Oil level (oil amount) Decrease oil level by about 5~10 mm (0.2~0.4
in).
Spring Replace with soft spring.
Unsmooth Outer tube Check for any bends, dents, and other notice-
movement over 1111Inner tube able scars, etc. If any, replace affected parts.
entire range
Under bracket tightening Retighten to specified torque.
torque
Poor initial Rebound damping Turn adjuster counterclockwise (about 2 clicks)
movement1to decrease damping.
Oil seal Apply grease in oil seal wall.
Compression damping Turn adjuster clockwise (about 2 clicks) to in-
Soft over entire crease damping.
range, bottoming 11Oil level (oil amount) Increase oil level by about 5~10 mm (0.2~0.4
outin).
Spring Replace with stiff spring.
Stiff toward stroke
1Oil level (oil amount) Decrease oil level by about 5 mm (0.2 in).
end
Soft toward stroke
1Oil level (oil amount) Increase oil level by about 5 mm (0.2 in).
end, bottoming out
Stiff initial
1111Compression dampingTurn adjuster counterclockwise (about 2 clicks)
movement to decrease damping.
Compression damping Turn adjuster clockwise (about 2 clicks) to in-
crease damping.
Low front, tending Rebound damping Turn adjuster counterclockwise (about 2 clicks)
to lower front 11to decrease damping.
postureBalance with rear end Set sunken length for 95~100 mm (3.7~3.9 in)
when one passenger is astride seat (lower rear
posture).
Oil level (oil amount) Increase oil level by about 5 mm (0.2 in).
Compression damping Turn adjuster counterclockwise (about 2 clicks)
to decrease damping.
“Obtrusive” front, Balance with rear end Set sunken length for 90~95 mm (3.5~3.7 in)
tending to upper 11when one passenger is astride seat (upper rear
front postureposture).
Spring Replace with soft spring.
Oil lever (oil amount) Decrease oil level by about 5~10 mm (0.2~0.4
in).

7-25
TUNSETTING
9Rear shock absorber
NOTE:
9If any of the following symptoms is experienced with the standard position as the base, make reset-
ting by reference to the adjustment procedure given in the same chart.
9Adjust the rebound damping in 2-click increments or decrements.
9Adjust the low compression damping in 1-click increments or decrements.
9Adjust the height compression damping in 1/6 turn increments or decrements.
Section
Symptom
JumpLarge
Medium Small Check Adjust
gap gap gap
Rebound damping Turn adjuster counterclockwise (about 2 clicks)
Stiff, tending to
11to decrease damping.
sink Spring set length Set sunken length for 90~100 mm (3.5~3.9 in)
when one passenger is astride seat.
Rebound damping Turn adjuster clockwise (about 2 clicks) to in-
Spongy and crease damping.
unstable11Low compression Turn adjuster clockwise (about 1 click) to in-
damping crease damping.
Spring Replace with stiff spring.
Heavy and Rebound damping Turn adjuster counterclockwise (about 2 clicks)
dragging11to decrease damping.
Spring Replace with soft spring.
Rebound damping Turn adjuster counterclockwise (about 2 clicks)
to decrease damping.
Low compression Turn adjuster clockwise (about 1 click) to in-
damping crease damping.
Poor road gripping1High compression Turn adjuster clockwise (about 1/6 turn) to
damping increase damping.
Spring set length Set sunken length for 90~100 mm (3.5~3.9 in)
when one passenger is astride seat.
Spring Replace with soft spring.
High compression Turn adjuster clockwise (about 1/6 turn) to in-
damping crease damping.
Bottoming out11Spring set length Set sunken length for 90~100 mm (3.5~3.9 in)
when one passenger in astride seat.
Spring Replace with stiff spring.
Rebound damping Turn adjuster clockwise (about 2 clicks) to in-
Bouncing11crease damping.
Spring Replace with soft spring.
High compression Turn adjuster counterclockwise (about 1/6
damping turn) to decrease damping.
Stiff travel11Spring set length Set sunken length for 90~100 mm (3.5~3.9 in)
when one passenger is astride seat.
Spring Replace with soft spring.