2004 YAMAHA YZ125LC brake

5-44
CHASHANDLEBAR
10. Install:
9Bolt (grip cap) 1
w
9Install the grip cap so that the gaps a a
and
b b
between the bolt (grip cap) and brake
lever 2 2
are equal. If you make a mistake in
the grip cap installation position, the brake
lever may contact the grip cap, resulting in
poor brake performance.
9After tightening the bolts, check that the
throttle grip 3 3
moves smoothly. If it does
not, retighten the bolts for adjustment.
11. Install:
9“ENGINE STOP” button 1
9Clutch lever holder 2
9Bolt (clutch lever holder) 3
9Clamp 4
NOTE:
9The “ENGINE STOP” button, clutch lever hold-
er and clamp should be installed according to
the dimensions shown.
9Pass the “ENGINE STOP” button lead in the
middle of the clutch holder.
12. Install:
9Clutch cable 1
NOTE:
Apply the lithium soap base grease on the clutch
cable end.
13. Adjust:
9Clutch lever free play
Refer to “CLUTCH ADJUSTMENT” section in
the CHAPTER 3.
4 Nm (0.4 m•kg, 2.9 ft•lb)
4 Nm (0.4 m•kg, 2.9 ft•lb)
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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

7-11
TUNSETTING
Symptom Setting Checking
0~1/4 throttle Use jet needle having a smaller Number of turns-back 
* Hard breathing diameter. Correct properly
Speed down Overflow from carburetor
0~1/4 throttle Use jet needle having a larger
Poor acceleration diameter.
White smoke
Unstable at low speeds Lower jet needle clip position.
Pinking noise (1 groove down)
Turn in pilot air screw.
Poor response at extremely Reduce pilot jet calibration No. Dragging brake
low speed Turn out pilot air screw. Overflow from carburetor
If not effect, reverse the
above procedures.
Poor response in Raise jet needle clip position.
the range of low to If no effect, reverse the above
intermediate speeds procedures.
Poor response when Check overall settings. Check air cleaner for fouling.
throttle is opened quickly Use main jet having lower
calibration No.
Raise jet needle clip position.
(1 groove up)
If no effect, reverse the above
procedures.
Poor engine operation Turn in pilot air screw. Check throttle valve operation.
This should be taken simply for an example.
It is necessary to set the carburetor while
checking the operating conditions of the
engine and discoloration of spark plugs.
Normally, carburetor setting is made by
means of the main jet, jet needle clip position
(including one with 0.5 difference), pilot jet
and pilot air screw. If the result of setting is
still unsatisfactory, it is advisable to change
the diameter of the straight portion the jet
needle.
*In case of hard breathing, check the air vent hose for clogging.
5XE-9-30-7A 4/30/03 9:39 AM Page 25