2004 YAMAHA YZ125LC Rear shock

3-29
REAR SHOCK ABSORBER INSPECTION
INSP
ADJ
9STANDARD POSITION:
This is the position which is back by the spe-
cific number of clicks from the fully turned-in
position.
cC
Do not force the adjuster past the minimum
or maximum extent of adjustment. The ad-
juster may be damaged.
w
Always adjust each front fork to the same
setting. Uneven adjustment can cause
poor handling and loss of stability.
3. Install:
9Rubber cap
EC36K000
REAR SHOCK ABSORBER INSPECTION
1. Inspect:
9Swingarm smooth action
Abnormal noise/Unsmooth action 
Grease the pivoting points or repair the
pivoting points.
Damage/Oil leakage Replace.
Minimum
20 clicks out
(from maximum
position)
Extent of adjustment:
Maximum
Fully turned in
position
Standard position:
12 clicks out
*13 clicks out
*For EUROPE
5XE-9-30-3B 4/16/03 10:24 AM Page 22

3-30
REAR SHOCK ABSORBER SPRING PRELOAD
ADJUSTMENTINSP
ADJ
EC36M014
REAR SHOCK ABSORBER SPRING
PRELOAD ADJUSTMENT
1. Elevate the rear wheel by placing the suit-
able stand under the engine.
2. Remove:
9Rear frame
3. Loosen:
9Locknut 1
4. Adjust:
9Spring preload
By turning the adjuster 2.
NOTE:
9Be sure to remove all dirt and mud from around
the locknut and adjuster before
adjustment.
9The length of the spring (installed) changes 1.5
mm (0.06 in) per turn of the adjuster.
cC
Never attempt to turn the adjuster beyond
the maximum or minimum setting.
5. Tighten:
9Locknut
6. Install:
9Rear frame (upper)
9Rear frame (lower)
Stiffer Increase the spring preload.
(Turn the adjuster 2 2
in.)
Softer Decrease the spring pre-
load. (Turn the adjuster 2 2
out.)
Extent of adjustment
240.5~258.5 mm
(9.47~10.18 in)
*255.5~273.5 mm
(10.06~10.77 in)
Spring length (installed) a a
:
Standard length
248 mm (9.76 in)
*265 mm (10.43 in)
*For EUROPE
32 Nm (3.2 m•kg, 23 ft•lb)
29 Nm (2.9 m•kg, 21 ft•lb)
5XE-9-30-3B 4/16/03 10:24 AM Page 24

3-31
REAR SHOCK ABSORBER REBOUND DAMPING
FORCE ADJUSTMENTINSP
ADJ
EC36N014
REAR SHOCK ABSORBER REBOUND
DAMPING FORCE ADJUSTMENT
1. Adjust:
9Rebound damping force
By turning the adjuster 1.
9STANDARD POSITION:
This is the position which is back by the specif-
ic number of clicks from the fully turned-in posi-
tion. (Which align the punch mark aon the ad-
juster with the punch mark bon the bracket.)
cC
Do not force the adjuster past the mini-
mum or maximum extent of adjustment.
The adjuster may be damaged.
Stiffer a a
Increase the rebound damping
force. (Turn the adjuster 1 1
in.)
Softer b b
Decrease the rebound
damping force. (Turn the ad-
juster 1 1
out.)
Minimum
20 clicks out
(from maximum
position)
Extent of adjustment:
Maximum
Fully turned in
position
Standard position:
About 11 clicks out
5XE-9-30-3B 4/16/03 10:24 AM Page 26

3-32
REAR SHOCK ABSORBER LOW COMPRESSION
DAMPING FORCE ADJUSTMENTINSP
ADJ
EC36c000
REAR SHOCK ABSORBER LOW
COMPRESSION DAMPING FORCE
ADJUSTMENT
1. Adjust:
9Low compression damping force
By turning the adjuster 1.
9STANDARD POSITION:
This is the position which is back by the specif-
ic number of clicks from the fully turned-in posi-
tion. (Which align the punch mark aon the ad-
juster with the punch mark bon the high com-
pression damping adjuster.)
cC
Do not force the adjuster past the mini-
mum or maximum extent of adjustment.
The adjuster may be damaged.
Stiffer a a
Increase the low compression
damping force. (Turn the ad-
juster 1 1
in.)
Softer b b
Decrease the low compres-
sion damping force. (Turn
the adjuster 1 1
out.)
Minimum
20 clicks out
(from maximum
position)
Extent of adjustment:
Maximum
Fully turned in
position
Standard position:
About 13 clicks out
*About 12 clicks out
*For EUROPE
5XE-9-30-3B 4/16/03 10:24 AM Page 28

3-33
REAR SHOCK ABSORBER HIGH COMPRESSION
DAMPING FORCE ADJUSTMENTINSP
ADJ
EC36d000
REAR SHOCK ABSORBER HIGH
COMPRESSION DAMPING FORCE
ADJUSTMENT
1. Adjust:
9High compression damping force
By turning the adjuster 1.
9STANDARD POSITION:
This is the position which is back by the specif-
ic number of turns from the fully turned-in posi-
tion. (Which align the punch mark aon the ad-
juster with the punch mark bon the adjuster
body.)
cC
Do not force the adjuster past the mini-
mum or maximum extent of adjustment.
The adjuster may be damaged.
Stiffer a a
Increase the high compression
damping force. (Turn the ad-
juster 1 1
in.)
Softer b b
Decrease the high compres-
sion damping force. (Turn
the adjuster 1 1
out.)
Minimum
2 turns out
(from maximum
position)
Extent of adjustment:
Maximum
Fully turned in
position
Standard position:
About 1-1/8 turns out
5XE-9-30-3B 4/16/03 10:24 AM Page 30

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
1 Nm (0.1 m•kg, 0.7 ft•lb)
5XE-9-30-5A 4/28/03 6:07 PM Page 48

5-51
CHASSWINGARM
Extent of removal Order Part name Q’ty Remarks
SWINGARM REMOVAL
Preparation for
Hold the machine by placing the
removalsuitable stand under the engine.
Brake hose holderRefer to “FRONT BRAKE AND
Rear caliperREAR BRAKE”section.
Bolt (brake pedal) Shift the brake pedal backward.
Drive chain
1 Chain support 1
2 Chain tensioner (lower) 1
3
Bolt (rear shock absorber-relay arm)1 Hold the swingarm.
4 Bolt (connecting rod) 1
5 Pivot shaft 1
6 Swingarm 1 Extent of removal:
1Swingarm removal
1
w
Support the machine securely so there is no dan-
ger of it falling over.



EC570000
SWINGARM
53 Nm (5.3 m•kg, 38 ft•lb)
80 Nm (8.0 m•kg, 58 ft•lb)
19 Nm (1.9 m•kg, 13 ft•lb)
7 Nm (0.7 m•kg, 5.1 ft•lb)
85 Nm (8.5 m•kg, 61 ft•lb)
5XE-9-30-5D 4/28/03 6:02 PM Page 2

5-57
CHASSWINGARM
10. Tighten:
9Nut (connecting rod) 1
11. Tighten:
9Nut (relay arm) 1
80 Nm (8.0 m•kg, 58 ft•lb)
80 Nm (8.0 m•kg, 58 ft•lb)
8. Install:
9Bolt (connecting rod) 1
9Plain washer 2
9Nut (connecting rod) 3
NOTE:
9Apply the molybdenum disulfide grease on the
bolt.
9Do not tighten the nut yet.
9. Install:
9Bolt (rear shock absorber-relay arm) 1
9Nut (rear shock absorber-relay arm) 2
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
53 Nm (5.3 m•kg, 38 ft•lb)
7. Check:
9Swingarm side play
a
Free play exists  Replace thrust bearing.
9Swingarm up and down movement b
Unsmooth movement/Binding/Rough
spotsGrease or replace bearings, bushes
and collars.
5XE-9-30-5D 4/28/03 6:02 PM Page 14