2006 YAMAHA YZ125LC clutch

2-9
SPECMAINTENANCE SPECIFICATIONS
NOTE:
1. First, tighten the ring nut approximately 38 Nm (3.8 m•kg, 27 ft•lb) by using the ring nut wrench,
then loosen the ring nut one turn.
2. Retighten the ring nut 7 Nm (0.7 m•kg, 5.1 ft•lb).
Part to be tightened Thread size Q'tyT ightening torqueNm m•kg ft•lb
Handle crown and outer tube M 8 ×1.25 4 23 2.3 17
Under bracket and outer tube M 8 ×1.25 4 20 2.0 14
Handle crown and steering shaft M24 ×1.0 1 145 14.5 105
Handlebar holder (upper) M 8 ×1.25 4 28 2.8 20
Handlebar holder (lower) M12 ×1.25 2 40 4.0 29
Steering ring nut M28 ×1.0 1 Refer to NOTE.
Front fork and damper assembly M51 ×1.5 2 30 3.0 22
Front fork and adjuster M22 ×1.25 2 55 5.5 40
Damper assembly and base valve M42 ×1.5 2 29 2.9 21
Adjuster and damper assembly M12 ×1.25 2 29 2.9 21
Bleed screw (front fork) and base valve M 5 ×0.8 2 1 0.1 0.7
Front fork and protector M 6 ×1.0 6 7 0.7 5.1
Cable guide (front brake hose) and under bracketM 6 ×1.0 1 4 0.4 2.9
Protector and brake hose holder M 6 ×1.0 2 7 0.7 5.1
Throttle cable cap M 4 ×0.7 2 1 0.1 0.7
Front brake master cylinder and bracket M 6 × 1.0 2 9 0.9 6.5
Brake lever (bolt) M 6 ×1.0 1 6 0.6 4.3
(nut) M 6 ×1.0 1 6 0.6 4.3
Brake lever position locknut M 6 ×1.0 1 5 0.5 3.6
Clutch lever (nut) M 6 ×1.0 1 4 0.4 2.9
Clutch lever holder M 5 ×0.8 2 4 0.4 2.9
Front brake master cylinder cap M 4 ×0.7 2 2 0.2 1.4
Front brake hose union bolt (master cylinder)M10 ×1.25 1 30 3.0 22
Front brake hose union bolt (caliper) M10 ×1.25 1 30 3.0 22
Front brake caliper and front fork M 8 ×1.25 2 23 2.3 17
Front brake caliper and brake hose holder M 6 ×1.0 1 10 1.0 7.2
Grip cap upper and lower M 6 ×1.0 2 4 0.4 2.9
Brake caliper (front and rear) and pad pin plugM10 ×1.0 2 3 0.3 2.2
Brake caliper (front and rear) and pad pin M10 ×1.0 2 18 1.8 13
Brake caliper (front and rear) and bleed screwM 8 ×1.25 2 6 0.6 4.3
Front wheel axle and nut M16 ×1.5 1 105 10.5 75
Front wheel axle holder M 8 ×1.25 4 23 2.3 17
Front brake disc and wheel hub M 6 ×1.0 6 12 1.2 8.7
Rear brake disc and wheel hub M 6 ×1.0 6 14 1.4 10
Footrest bracket and frame M10 ×1.25 4 55 5.5 40
Brake pedal mounting M 8 ×1.25 1 26 2.6 19


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1C3-9-31-2A 4/30/05 2:37 PM Page 10

2-13
SPECCABLE ROUTING DIAGRAM
EC240000
CABLE ROUTING DIAGRAM
1“ENGINE STOP” button lead
2Throttle cable
3Clutch cable
4Ground lead
5High tension cord
6Clamp
7Air vent hose
8Radiator breather hose
9CDI magneto lead
0YPVS breather hose
qEngine bracket (right)
wEngine bracket (left)
eCrankcase breather hose
rOverflow hose
tConnector coverAPass the clutch cable on the
outside of the throttle cable and
“ENGINE STOP” button lead.
BAlign the throttle cable locating
tape with the cable guide.
CPass the throttle cable, clutch
cable and “ENGINE STOP”
button lead above the radiator
hose.
DInstall the ignition coil, side
core and ground lead together
to the frame. Take care to fas-
ten the ground lead so that its
terminal is within the indicated
range.
EClamp the throttle cable and
high tension cord to the frame.FClamp the clutch cable to the
left engine bracket. Clamp the
clutch cable below the posi-
tioning grommet.
GPass the air vent hose back of
the throttle cable.
HPass the air vent hose, over-
flow hose and crankcase
breather hose between the
frame and connecting rod.
IPass the radiator breather
hose and YPVS breather hose
outside the engine bracket and
inside the down tube. Then
pass the radiator breather
hose inside the YPVS breather
hose.
1C3-9-31-2B 5/11/05 9:50 AM Page 26

2-15
SPECCABLE ROUTING DIAGRAM
1High tension cord
2“ENGINE STOP” button lead
3Ignition coil lead
4Clamp
5CDI unit
6CDI unit band
7Radiator breather hose
8CDI magneto lead
9Connector cover
0Throttle cable
qClutch cable
wCDI unit stay
APass the high tension cord to
the left of the radiator hose.
BUsing a plastic locking tie,
clamp the “ENGINE STOP”
button lead, ignition coil leadand CDI magneto lead togeth-
er with the clamp ends back-
ward and then cut off the tie
end.
CClamp to the frame the throttle
cable, clutch cable, ignition coil
lead and “ENGINE STOP” but-
ton lead. In so doing, clamp
the ignition coil lead and
“ENGINE STOP” button lead at
their protecting tubes. Tighten
the clamp so that the “ENGINE
STOP” button lead is not
pulled when the handlebar is
turned to the right and left.
DPass the CDI magneto lead
and radiator breather hose
between the frame and the
radiator(right).EClamp the CDI magneto lead
to the frame at its locating
tape.
FBring the connector cover into
contact with the coupler.
GLocate the clamp ends in the
arrowed range.
HInsert the CDI unit band until it
stops at the CDI unit stay.
IPass the CDI magneto lead
and radiator breather hose
between the frame and the
radiator hose so that they
come within the arrow-indicat-
ed range. Also take care so
that the CDI magneto lead
passes on the left of the radia-
tor breather hose.
1C3-9-31-2B 5/11/05 9:50 AM Page 30

2-17
SPECCABLE ROUTING DIAGRAM
AInstall the brake hose so that its pipe portion
directs as shown and lightly touches the projec-
tion on the master cylinder.
BPass the “ENGINE STOP” button lead in the
middle of the clutch holder.
CClamp the “ENGINE STOP” button lead to the
handlebar to 3 clicks.
DPass the brake hose in front of the number
plate and through the cable guide.
EPass the clutch cable through the cable guide
on the number plate. 1Brake hose
2Master cylinder
3“ENGINE STOP” button lead
4“ENGINE STOP” button
5Throttle cable
6Clutch cable
7Clamp
8Cable guide
1C3-9-31-2B 5/11/05 9:50 AM Page 34

3-1
MAINTENANCE INTERVALS
INSP
ADJ
EC300000
REGULAR INSPECTION AND ADJUSTMENTS
EC310053
MAINTENANCE INTERVALS
The following schedule is intended as a general guide to maintenance and lubrication. Bear in mind
that such factors as weather, terrain, geographical location, and individual usage will alter the required
maintenance and lubrication intervals. If you are a doubt as to what intervals to follow in maintaining
and lubricating your machine, consult your Yamaha dealer.
Item Remarks
After
break-
inEvery
raceEvery
thirdEvery
fifthAs re-
quired
Inspect crack
Inspect carbon deposits
and eliminate them
Check ring end gap
Inspect carbon deposits
and eliminate them
Check gasket
Inspect score marks
Inspect wear
Inspect carbon deposits
and eliminate them
Inspect housing, friction
plate, clutch plate and
spring
Yamalube 4 (10W-30) or
SAE 10W-30 SE motor oil
Inspect wear
Use chain lube
Chain slack: 48~58 mm
(1.9~2.3 in) PISTON
Inspect and clean

Replace
PISTON RING
Inspect
Replace
PISTON PIN, SMALL END BEARING
Inspect
Replace
CYLINDER HEAD
Inspect and clean
Retighten
CYLINDER
Inspect and clean
Replace
YPVS
Inspect and clean
CLUTCH
Inspect and adjust
Replace
TRANSMISSION
Replace oil
Inspect
Replace bearing
SHIFT FORK, SHIFT CAM, GUIDE BAR
Inspect
ROTOR NUT
Retighten
MUFFLER
Inspect
Clean
Retighten
CRANK
Inspect and clean
CARBURETOR
Inspect, adjust and clean
SPARK PLUG
Inspect and clean
Replace
DRIVE CHAIN
Lubricate, slack, alignment
Replace
1C3-9-31-3A 4/28/05 2:48 PM Page 2

3-4
PRE-OPERATION INSPECTION AND MAINTENANCE
INSP
ADJ
EC320000
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating
condition.
Before using this machine, check the following points.
EC321000
GENERAL INSPECTION AND MAINTENANCE
Item Routine Page
Coolant Check that coolant is filled up to the radiator filler cap.
Check the cooling system for leakage.P3-5~9
Fuel Check that a fresh mixture of oil and gasoline is filled in
the fuel tank. Check the fuel line for leakage.P1-12
Transmission oil Check that the oil level is correct. Check the crankcase
for leakage.P3-12~14
Gear shifter and clutch Check that gears can be shifted correctly in order and
that the clutch operates smoothly.P3-9
Throttle grip/Housing Check that the throttle grip operation and free play
are correctly adjusted. Lubricate the throttle grip and P3-10~11
housing, if necessary.
Brakes Check the play of front brake and effect of front and
rear brake.P3-17~23
Chain Check chain slack and alignment. Check that the chain
is lubricated properly.P3-24~26
Wheels Check for excessive wear and tire pressure. Check for
loose spokes and have no excessive play.P3-34~35
Steering Check that the handlebar can be turned smoothly and
have no excessive play.P3-35~36
Front forks and Check that they operate smoothly and there is no oil
rear shock absorber leakage.P3-26~33
Cables (wires) Check that the clutch and throttle cables move smooth-
ly. Check that they are not caught when the handlebars —
are turned or when the front forks travel up and down.
Muffler Check that the muffler is tightly mounted and has no
cracks.P3-15~16
Sprocket Check that the driven sprocket tightening bolt is
not loose.P3-24
Lubrication Check for smooth operation. Lubricate if necessary. P3-37
Bolts and nuts Check the chassis and engine for loose bolts and nuts. P1-16
Lead connectors Check that the CDI magneto, CDI unit, and ignition coil
are connected tightly.P1-6
Settings Is the machine set suitably for the condition of the
racing course and weather or by taking into account the
P7-1~23
results of test runs before racing? Are inspection and
maintenance completely done?
1C3-9-31-3A 4/28/05 2:48 PM Page 14

3-9
INSP
ADJ
CLUTCH ADJUSTMENT
4. Inspect:
9Pressure
Impossible to maintain the specified pres-
sure for 10 seconds Repair.
9Radiator 1
9Radiator hose joint 2
Coolant leakage Repair or replace.
9Radiator hose 3
Swelling Replace.
2. Adjust:
9Clutch lever free play
EC359020
CLUTCH ADJUSTMENT
1. Check:
9Clutch lever free play a
Out of specification Adjust.
NOTE:
9Before adjustment, expose the adjuster by
moving the boot 3and cap 4away.
9Make minute adjustment on the lever side
using the adjuster 5.
9After adjustment, check proper operation of
clutch lever.
Clutch lever free play a a
:
8~13 mm (0.31~0.51 in)
Clutch lever free play adjustment steps:
9Loosen the locknut 1.
9Turn the adjuster 2until free play ais with-
in the specified limits.
9Tighten the locknut.
Locknut:
4 Nm (0.4 m•kg, 2.9 ft•lb)
3. Install:
9Cap 1
9Boot 2
NOTE:
Place the tip aof the cap in the boot.
1C3-9-31-3A 4/28/05 2:48 PM Page 26

3-37
LUBRICATION
INSP
ADJ
EC36a042
LUBRICATION
To ensure smooth operation of all components,
lubricate your machine during setup, after break-
in, and after every race.
1All control cable
2Clutch lever pivot
3Shift pedal pivot
4Footrest pivot
5Throttle-to-handlebar contact
6Drive chain
7Throttle roller cable guide
8Throttle roller sliding surface
9Tube guide cable winding portion
0Throttle cable end
qClutch cable endÅUse Yamaha cable lube or equivalent on
these areas.
ıUse SAE10W-30 motor oil or suitable chain
lubricants.
ÇLubricate the following areas with high quali-
ty, lightweight lithium-soap base grease.
cC
Wipe off any excess grease, and avoid getting
grease on the brake discs.
A
A
CC
AB
AA
1C3-9-31-3B 4/30/05 3:00 PM Page 38