lock YAMAHA YZ125LC 2006 Workshop Manual

5-32
CHASFRONT FORK
EC554502
Inner tube
1. Inspect:
9Inner tube surface a
Score marksRepair or replace.
Use #1,000 grit wet sandpaper.
Damaged oil lock pieceReplace.
9Inner tube bends
Out of specificationReplace.
Use the dial gauge 1.
NOTE:
The bending value is shown by one half of the
dial gauge reading.
w
Do not attempt to straighten a bent inner
tube as this may dangerously weaken the
tube.
Inner tube bending limit:
0.2 mm (0.008 in)
EC554600
Outer tube
1. Inspect:
9Outer tube 1
Score marks/Wear/DamageReplace.
Adjuster
1. Inspect:
9Adjuster 1
9O-ring 2
Wear/DamageReplace.
1C3-9-31-5B 5/11/05 1:30 PM Page 14

5-34
CHASFRONT FORK
5. Measure:
9Oil level (left and right) a
Out of specification  Adjust.
Standard oil level:
145~148 mm (5.71~5.83 in)
From top of fully stretched
damper assembly.
6. Tighten:
9Locknut 1
NOTE:
Fully finger tighten the locknut onto the
damper assembly.
7. Loosen:
9Compression damping adjuster 1
NOTE:
9Loosen the compression damping adjuster fin-
ger tight.
9Record the set position of the adjuster (the
amount of turning out the fully turned in posi-
tion).
8. Install:
9Base valve 1
To damper assembly 2.
NOTE:
First bring the damper rod pressure to a maxi-
mum. Then install the base valve while releas-
ing the damper rod pressure.
9. Check that the damper assembly is fully
stretched.
Not fully stretched  Repeat the steps 2 to 8.
1C3-9-31-5B 9/12/05 3:57 PM Page 18

5-38
CHASFRONT FORK
22. Check:
9Inner tube smooth movement
Tightness/Binding/Rough spots Repeat the
steps 15 to 21.
23. Measure:
9Distance a
Out of specificationTurn into the locknut.
Distance a a
:
19 mm (0.75 in) or more
Between damper assembly
1 1
bottom and locknut 2
2bottom.
24. Install:
9Collar 1
9Fork spring 2
To damper assembly 3.
NOTE:
Install the collar with its larger dia. end afacing
the fork spring.
25. Install:
9Damper assembly 1
To inner tube 2.
cC
To install the damper assembly into the
inner tube, hold the inner tube aslant. If the
inner tube is held vertically, the damper
assembly may fall into it, damaging the
valve inside.
26. Loosen:
9Rebound damping adjuster 1
NOTE:
9Loosen the rebound damping adjuster finger
tight.
9Record the set position of the adjuster (the
amount of turning out the fully turned in posi-
tion).
1C3-9-31-5B 9/12/05 3:57 PM Page 26

5-39
CHASFRONT FORK
27. Install:
9Push rod 1
9Copper washer 2
9Adjuster 3
To damper assembly 4.
NOTE:
9While compressing the inner tube 5, set the
cap bolt ring wrench 7between the inner tube
and locknut 6.
9Fully finger tighten the adjuster onto the
damper assembly.
28. Inspect:
9Gap abetween adjuster 1and locknut 2.
Out of specificationRetighten and read-
just the locknut.
NOTE:
If the adjuster is installed out of specification,
proper damping force cannot be obtained.
29. Tighten:
9Adjuster (locknut) 1
NOTE:
Hold the locknut 2and tighten the adjuster with
specified torque.
30. Install:
9Adjuster 1
To inner tube.
31. Fill:
9Front fork oil 1
From outer tube top.
*For EUROPE
29 Nm (2.9 m•kg, 21 ft•lb)
55 Nm (5.5 m•kg, 40 ft•lb)
Gap a abetween adjuster and locknut :
0.5~1.0mm (0.02~0.04 in)
Recommended oil:
Suspension oil "S1"
Standard oil amount:
340 cm
3(12.0 Imp oz, 11.5 US oz)
*335 cm
3(11.8 Imp oz, 11.3 US oz)
Extent of adjustment:
300
~380 cm3(10.6~13.4 Imp oz,
10.1~12.8 US oz)
Cap bolt ring wrench:
YM-01501/90890-01501
1C3-9-31-5B 9/12/05 3:57 PM Page 28

5-53
CHASSTEERING
4. Install:
9Ring nut 1
Tighten the ring nut using the ring nut
wrench 2.
Refer to “STEERING HEAD INSPECTION
AND ADJUSTMENT” section in the CHAP-
TER 3.
5. Check the steering shaft by turning it lock to
lock. If there is any binding, remove the
steering shaft assembly and inspect the
steering bearings.
6. Install:
9Plain washer 1
7. Install:
9Front fork 1
9Handle crown 2
NOTE:
9Temporarily tighten the pinch bolts (under
bracket).
9Do not tighten the pinch bolts (handle crown)
yet.
8. Install:
9Plain washer 1
9Steering shaft nut 2
7 Nm (0.7 m•kg, 5.1 ft•lb)
145 Nm (14.5 m•kg, 105 ft•lb)
1C3-9-31-5C 5/11/05 1:13 PM Page 24

5-63
CHASREAR SHOCK ABSORBER
Extent of removal:1Rear shock absorber removal 2Rear shock absorber disassembly
56 Nm (5.6 m•kg, 40 ft•lb)
53 Nm (5.3 m•kg, 38 ft•lb)
32 Nm (3.2 m•kg, 23 ft•lb)
EC580000
REAR SHOCK ABSORBER
29 Nm (2.9 m•kg, 21 ft•lb)
2 Nm (0.2 m•kg, 1.4 ft•lb)
Extent of removal Order Part name Q’ty Remarks
REAR SHOCK ABSORBER
REMOVAL
Preparation forHold the machine by placing the
removalsuitable stand under the engine.
SeatRefer to “SEAT, FUEL TANK AND
SIDE COVERS” section in the CHAPTER 4.
SilencerRefer to “EXHAUST PIPE AND
SILENCER” section in the CHAPTER 4.
1 Clamp (air cleaner joint) 1 Loosen the bolt (air cleaner joint).
2 Rear frame 1
3
Bolt (rear shock absorber-relay arm)1 Hold the swingarm.
4 Bolt (rear shock absorber-frame) 1
5 Rear shock absorber 1
6 Locknut 1
7 Adjuster 1
8 Spring seat 2
9 Spring guide (lower) 1
10 Spring guide (upper) 1
11 Spring (rear shock absorber) 1
12 Bearing 2 Refer to “REMOVAL POINTS”.
2
w
Support the machine securely so there is no dan-
ger of it falling over.
1
1C3-9-31-5D 4/28/05 4:07 PM Page 18

5-67
CHASREAR SHOCK ABSORBER
EC5852B5
Rear shock absorber
1. Install:
9Dust seal 1
9O-ring 2
9Collar 3
NOTE:
9Apply the molybdenum disulfide grease on the
dust seal lips and collars.
9Apply the lithium soap base grease on the O-
rings.
2. Install:
9Bush 1
9Collar 2
9Dust seal 3
NOTE:
9Apply the molybdenum disulfide grease on the
bearing and dust seal lips.
9Install the dust seals with their lips facing out-
ward.
4. Adjust:
9Spring length (installed)
Refer to “REAR SHOCK ABSORBER
SPRING PRELOAD ADJUSTMENT” sec-
tion in the CHAPTER 3.
5. Tighten:
9Locknut 1
3. Tighten:
9Adjuster 1
1C3-9-31-5D 4/28/05 4:08 PM Page 26

6-3
ELEC
SYSTEME D’ALLUMAGE
ZÜNDANLAGE
SISTEMA DI ACCENSIONE
TEST DER ZÜNDFUNKENSTRECKE
1. Den Zündkerzenstecker von der
Zündkerze abtrennen.
2. Den dynamischen Zündfunken-
prüfer 1(Zündungs-Prüfgerät
2) gemäß Abbildung an-
schließen.
9Zündkerzenstecker 3
9Zündkerze 4
AFür USA und CDN
BAußer USA und CDN
3. Den Motor mit Hilfe des Kickstar-
ters durchdrehen.
4. Die Zündfunkenstrecke kontrollie-
ren.
5. Den Motor anlassen und die
Zündfunkenstrecke vergrößern,
bis es zu Fehlzündungen kommt.
(nur für USA und CDN)
INSPEKTION DES ANSCHLUSSES
DER KUPPLUNGEN UND KABEL
1. Kontrollieren:
9Anschluss der Kupplungen und
Kabel
Rost/Staub/Lockerheit/Kurz-
schlussReparieren oder
erneuern.
INSPEKTION DES MOTORSTOPP-
KNOPFES „ENGINE STOP“
1. Prüfen:
9Kontakt des Motorstoppknop-
fes „ENGINE STOP“
Kein Stromdurchgang, wenn gedrückt
Erneuern.
Stromdurchgang, wenn freigelassen
Erneuern.ESSAI DE L’INTERVALLE
D’ETINCELLEMENT
D’ ALLUMAGE
1. Déconnecter le capuchon de bou-
gie de la bougie.
2. Connecter le testeur dynamique
d’étincelle 1(testeur d’allumage
2) comme indiqué.
9Capuchon de bougie 3
9Bougie 4
A Pour USA et CDN
BExcepté pour USA et CDN
3. Actionner la pédale de kick.
4. Contrôler l’écartement d’étincelle
d’allumage.
5. Démarrer le moteur et augmenter
l’intervalle d’étincellement jusqu’à
ce qu’un raté se produise. (unique-
ment USA et CDN)
VERIFICATION DE CONNEXION
DES COUPLEURS ET FILS
1. Contrôler:
9Connexion des coupleurs et fils
Rouille/poussière/desserré/court
-circuit→
Réparer ou changer.
VERIFICATION DU BOUTON
D’ARRET DU MOTEUR “ENGINE
STOP”.
1. Examiner:
9Conductibilité du bouton d’arrêt
du moteur “ENGINE STOP”
Pas de continuité lorsqu’enfoncé 
Changer.
Continuité lorsque relâché  Changer.
IC622001
TEST DELLA DISTANZA TRA
GLI ELETTRODI
1. Scollegare la calotta della candela
dalla candela.
2. Collegare il tester dinamico delle
scintille 1(apparecchio per il
controllo dell’accensione 2) come
illustrato.
9Calotta della candela 3
9Candela 4
APer USA e CDN
BTranne che per USA e CDN
3. Azionare la pedivella della messa
in moto.
4. Controllare la distanza tra gli elet-
trodi dell’accensione.
5. Avviare il motore e aumentare la
distanza tra gli elettrodi finché non
si verifica uno scatto a vuoto. (sol-
tanto per USA e CDN)
IC624000
ISPEZIONE DEL
COLLEGAMENTO DI
ACCOPPIATORI E CONDUTTORI
1. Controllare:
9Collegamento di accoppiatori e
conduttori
Ruggine/Polvere/Allentamen-
to/Cortocircuito Ripararli o
sostituirli.
IC625002
ISPEZIONE DEL PULSANTE
“ARRESTO MOTORE”
1. Ispezionare:
9Comportamento del pulsante
“ARRESTO MOTORE”
Assenza di continuità mentre è premuto
Sostituirlo.
Continuità mentre viene rilasciato 
Sostituirlo.B/W B
Posizione12del seletto
re del tester
PREM-
11UTO
RILAS-Ω× ×

1
CIATO
Conduttore (+) del tester 
Conduttore Nero/Bianco 1
Conduttore (–) del tester 
Conduttore Nero 2
Distanza minima tra gli
elettrodi:
6,0 mm (0,24 in)
Ecartement d’étincelle
minimum:
6,0 mm (0,24 in)
Fil (+) de testeur 
Fil noir/blanc 1
Fil (–) de testeur 
Fil noir 2
B/W BPosition de12sélecteur du
testeur
ENFO-
11NCE
RELA-Ω× ×

1
CHE
Min. Zündfunkenstrecke:
6,0 mm (0,24 in)
Positives (+) Kabel des Prüfgerätes
Schwarz/Weißes Kabel 1
Negatives (–) Kabel des Prüfgerätes
Schwarzes Kabel 2
B/W BPosition des12Wählschaltersam Prüfgerät
GEDR-11ÜCKT
FREIGE-Ω×
×

1
LASSEN
1C3-9-31-6 4/21/05 3:31 PM Page 9

6-4
ELECIGNITION SYSTEM
EC626003
IGNITION COIL INSPECTION
1. Inspect:
9Primary coil resistance
Out of specification Replace.
2. Inspect:
9Secondary coil resistance
Out of specification Replace.
NOTE:
9Remove the spark plug cap by turning it coun-
terclockwise and inspect.
9Install the spark plug cap by turning it clock-
wise until it is tight.
Tester (+) leadYellow lead 1
Tester (–) lead
Black lead 2
Tester (+) leadSpark plug lead 1
Tester (–) lead
Yellow lead 2
Primary coil Tester selector
resistance position
0.24~0.36Ωat
Ω× 1
20°C (68°F)
Secondary coil Tester selector
resistance position
5.7~8.5kΩat
kΩ× 1
20°C (68°F)
1C3-9-31-6 4/21/05 3:31 PM Page 10

EC72P010
Front fork setting parts
9Front fork spring 1
NOTE:
The I.D. mark (slits) ais proved on the end of
the spring.
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.
SPRING SPRINGI.D.
TYPE
RATE PART NUMBERMARK
(slits)
SOFT 0.398 1C3-23141-A0 I
STD 0.408 1C3-23141-N0 –
0.418 1C3-23141-C0 III
0.428 1C3-23141-D0 IIII
0.438 1C3-23141-E0 IIIII
STIFF 0.449 1C3-23141-F0 I-I
0.459 1C3-23141-G0 I-II
0.469 1C3-23141-H0 I-III
0.479 1C3-23141-J0 I-IIII
7-17
TUNSETTING
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.
1C3-9-31-7B 5/11/05 11:30 AM Page 10