2001 YAMAHA YZ125LC relay

2-10
SPECMAINTENANCE SPECIFICATIONS
Part to be tightened Thread size Q'tyT ightening torqueNm m•kg ft•lb
Rear brake master cylinder and frame M 6 ´1.0 2 10 1.0 7.2
Rear brake reservoir tank and frame M 6 ´1.0 1 7 0.7 5.1
Rear brake hose union bolt (caliper) M10 ´1.25 1 30 3.0 22
Rear brake hose union bolt (master cylinder) M10 ´1.25 1 30 3.0 22
Rear wheel axle and nut M20 ´1.5 1 125 12.5 90
Nipple (spoke) – 72 3 0.3 2.2
Driven sprocket and wheel hub M 8 ´1.25 6 42 4.2 30
Disc cover and rear brake caliper M 6 ´1.0 2 7 0.7 5.1
Protector and rear brake caliper M 6 ´1.0 2 7 0.7 5.1
Engine mounting:
Engine and frame (front) M10 ´1.25 1 69 6.9 50
Engine and frame (lower) M10 ´1.25 1 69 6.9 50
Engine bracket and frame M 8 ´1.25 2 34 3.4 24
Engine bracket and engine M 8 ´1.25 1 34 3.4 24
Pivot shaft and nut M16 ´1.5 1 85 8.5 61
Relay arm and swingarm M14 ´1.5 1 80 8.0 58
Relay arm and connecting rod M14 ´1.5 1 80 8.0 58
Connecting rod and frame M14 ´1.5 1 80 8.0 58
Rear shock absorber and frame M10 ´1.25 1 56 5.6 40
Rear shock absorber and relay arm M10 ´1.25 1 53 5.3 38
Rear frame and frame M 8 ´1.25 3 29 2.9 21
Swingarm and brake hose holder M 5 ´–4 4 0.4 2.9
Chain tensioner mounting M 8 ´1.25 2 19 1.9 13
Chain support and swingarm M 6 ´1.0 3 7 0.7 5.1
Seal guard and swingarm M 5 ´0.8 4 5 0.5 3.6
Fuel tank mounting M 6 ´1.0 2 10 1.0 7.2
Fuel tank and fuel cock M 6 ´1.0 2 7 0.7 5.1
Fuel tank and seat set bracket M 6 ´1.0 1 7 0.7 5.1
Fuel tank and hooking screw (fitting band) M 6 ´1.0 1 7 0.7 5.1
Fuel tank and fuel tank bracket M 6 ´1.0 4 7 0.7 5.1
Air scoop mounting M 6 ´1.0 8 3 0.3 2.2
Front fender mounting M 6 ´1.0 4 7 0.7 5.1
Rear fender mounting M 6 ´1.0 4 7 0.7 5.1
Side cover mounting M 6 ´1.0 4 7 0.7 5.1
Seat mounting M 6 ´1.0 2 7 0.7 5.1
Number plate M 6 ´1.0 1 7 0.7 5.1
NOTE:
s
s- marked portion shall be checked for torque tightening after break-in or before each race.
s
s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
s s
5MV-9-30-2A 6/19/00 1:15 PM Page 11

3-2
MAINTENANCE INTERVALS
INSP
ADJ
Item Remarks
COOLING SYSTEM
Check coolant level and leakagell
Check radiator cap operationl
Replace coolantlEvery two years
Inspect hosesl
OUTSIDE NUTS AND BOLTS Refer to “STARTING
RetightenllAND BREAK-IN” section
in the CHAPTER 1.
AIR FILTER
Clean and lubricatellUse foam air-filter oil
Replacel
FRAME
Clean and inspectll
FUEL TANK, COCK
Clean and inspectll
BRAKES
Adjust lever position and pedal heightll
Lubricate pivot pointll
Check brake disc surfacell
Check fluid level and leakagell
Retighten brake disc bolts, caliper bolts,
ll
master cylinder bolts and union bolts
Replace padsl
Replace brake fluidlEvery one year
FRONT FORKS
Inspect and adjustll
Replace oilllSuspension oil “01”
Replace oil seall
FRONT FORK OIL SEAL AND DUST SEAL
Clean and lubellLithium base grease
REAR SHOCK ABSORBER
Inspect and adjustll
Lube ll
Molybdenum disulfide grease
Retightenll
CHAIN GUARD AND ROLLERS
Inspectll
SWINGARM
Inspect and retightenll
RELAY ARM, CONNECTING ROD
Inspect and lubellMolybdenum disulfide grease
STEERING HEAD
Inspect free play and retightenll
Clean and lubelLithium base grease
Replace bearingl
TIRE, WHEELS
Inspect air pressure, wheel run-out,
ll
tire wear and spoke looseness
Retighten sprocket boltll
Inspect bearingsl
Replace bearingsl
LubricatelLithium base grease
THROTTLE, CONTROL CABLE
Check routing and connectionllYamaha cable lube or
LubricatellSAE 10W-30 motor oil
After
break-
inEvery
raceEvery
thirdEvery
fifthAs re-
quired
3
5MV-9-30-3A 6/19/00 1:52 PM Page 3

5-52
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
EC570000
Extent of removal:1Swingarm removal
1
w
Support the machine securely so there is no dan-
ger of it falling over.
ü
ý
þ
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, 51 ft•lb)
85 Nm (8.5 m•kg, 61 ft•lb)
5MV-9-30-5D 6/19/00 1:26 PM Page 2

5-53
CHASSWINGARM
Extent of removal Order Part name Q’ty Remarks
SWINGARM DISASSEMBLY
1Cap 2
2Relay arm 1
3Connecting rod 1
4Collar 2
5Oil seal 2
6Thrust bearing 2
7Bush 2
8Oil seal 8
9Bearing 8 Refer to “REMOVAL POINTS”.
EC578000
SWINGARM DISASSEMBLY
Extent of removal:1Swingarm disassembly 2Connecting rod removal and disassembly
3Relay arm removal and disassembly
1
2
3
23
80 Nm (8.0 m•kg, 58 ft•lb)
5 Nm (0.5 m•kg, 3.6 ft•lb)
80 Nm (8.0 m•kg, 58 ft•lb)
5MV-9-30-5D 6/19/00 1:26 PM Page 4

5-54
CHASSWINGARM
EC573000
REMOVAL POINTS
EC573200
Bearing
1. Remove:
9Bearing 1
NOTE:
Install the bearing by pressing its outer race.
EC574010
INSPECTION
Wash the bearings, bushes, collars, and covers in
a solvent.
EC574111
Swingarm
1. Inspect:
9Bearing 1
9Bush 2
Free play exists/Unsmooth revolution/Rust Õ
Replace bearing and bush as a set.
2. Inspect:
9Oil seal 3
Damage ÕReplace.
EC574210
Relay arm
1. Inspect:
9Bearing 1
9Collar 2
Free play exists/Unsmooth revolution/Rust Õ
Replace bearing and collar as a set.
2. Inspect:
9Oil seal 3
Damage ÕReplace.
EC574310
Connecting rod
1. Inspect:
9Bearing 1
9Collar 2
Free play exists/Unsmooth revolution/Rust Õ
Replace bearing and collar as a set.
2. Inspect:
9Oil seal 3
Damage ÕReplace.
5MV-9-30-5D 6/19/00 1:26 PM Page 6

5-55
CHASSWINGARM
EC575000
ASSEMBLY AND INSTALLATION
EC575202
Bearing and oil seal
1. Install:
9Bearing 1
9Oil seal 2
To swingarm.
NOTE:
9Apply the molybdenum disulfide grease on the
bearing when installing.
9Install the bearing by pressing it on the side hav-
ing the manufacture's marks or numbers.
9First install the outer and then the inner bear-
ings to a specified depth from inside.
2. Install:
9Bearing 1
9Oil seal 2
To relay arm.
NOTE:
9Apply the molybdenum disulfide grease on the
bearing when installing.
9Install the bearing by pressing it on the side hav-
ing the manufacture's marks or numbers.
3. Install:
9Bearing 1
9Oil seal 2
To connecting rod.
NOTE:
9Apply the molybdenum disulfide grease on the
bearing when installing.
9Install the bearing by pressing it on the side hav-
ing the manufacture's marks or numbers.
Installed depth of bearings:
Outer a a
: Zero mm (Zero in)
Inner b b
: 8.5 mm (0.33 in)
Installed depth of bearings a a
:
5 mm (0.20 in)
Installed depth of bearings a a
:
5 mm (0.20 in)
5MV-9-30-5D 6/19/00 1:26 PM Page 8

5-56
CHASSWINGARM
EC5751B1
Swingarm
1. Install:
9Bush 1
9Thrust bearing 2
9Oil seal 3
9Collar 4
To swingarm 5.
NOTE:
Apply the molybdenum disulfide grease on the
bushes, thrust bearings and oil seal lips.
2. Install:
9Collar 1
To relay arm 2.
NOTE:
Apply the molybdenum disulfide grease on the
collars, bearings and oil seal lips.
3. Install:
9Collar 1
To connecting rod 2.
NOTE:
Apply the molybdenum disulfide grease on the
collar, bearings and oil seal lips.
4. Install:
9Connecting rod 1
9Bolt (connecting rod) 2
9Plain washer 3
9Nut (connecting rod) 4
To relay arm 5.
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
cC
Install the nut on the left side of the chas-
sis. If you make a mistake in its installation
position, the nut contacts the swingarm
when stroking the rear shock absorber.
80 Nm (8.0 m•kg, 58 ft•lb)
5MV-9-30-5D 6/19/00 1:26 PM Page 10

5-57
CHASSWINGARM
5. Install:
9Relay arm 1
9Bolt (relay arm) 2
9Plain washer 3
9Nut (relay arm) 4
To swingarm.
NOTE:
9Apply the molybdenum disulfide grease on the
bolt.
9Do not tighten the nut yet.
6. Install:
9Swingarm 1
9Pivot shaft 2
NOTE:
9Apply the molybdenum disulfide grease on the
pivot shaft.
9Insert the pivot shaft from right side.
7. Check:
9Swingarm side play a
Free play exists Õ Replace thrust bearing.
9Swingarm up and down movement b
Unsmooth movement/Binding/Rough
spotsÕGrease or replace bearings, bushes
and collars.
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:
9Plain washer 1
9Bolt (rear shock absorber-relay arm) 2
NOTE:
9Apply the molybdenum disulfide grease on the
bolt.
9Insert the bolt from right side.
85 Nm (8.5 m•kg, 61 ft•lb)
53 Nm (5.3 m•kg, 38 ft•lb)
5MV-9-30-5D 6/19/00 1:26 PM Page 12