2005 YAMAHA YZ125LC crankcase

4-45
ENGYPVS GOVERNOR
Extent of removal Order Part name Q’ty Remarks
YPVS GOVERNOR REMOVAL
Preparation for Crankcase cover (right)
Refer to “KICK AXLE, SHIFT SHAFT AND
removalPRIMARY DRIVE GEAR” section.
1 Governor assembly 1
2 Dowel pin 1 Refer to “REMOVAL POINTS”.
3 Retainer 1
4 Ball 4
5 Retainer weight 1
6 Plain washer 4
7 Thrust bearing 2
8 Collar 1
9 Plate 1
10 Compression spring 1
11 Governor gear 1
12 Governor shaft 1
EC4K0000
YPVS GOVERNOR
1
Extent of removal:1YPVS governor removal and disassembly
5 Nm (0.5 m•kg, 3.6 ft•lb)
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4-47
ENGYPVS GOVERNOR
2. Install:
9Ball 1
9Retainer 2
To governor shaft 3.
NOTE:
Apply the transmission oil on the retainer and
ball.
3. Install:
9Dowel pin 1
NOTE:
9While compressing the spring, install the dowel
pin.
9Make sure the dowel pin fits into the groove a
in the retainer.
4. Install:
9Governor assembly 1
NOTE:
Align the groove ain the governor with the fork
band set the governor in the crankcase cover.
1C3-9-30-4C 25/5/04 7:17 PM Page 22

4-48
ENGWATER PUMP
Extent of removal Order Part name Q’ty Remarks
WATER PUMP DISASSEMBLY
Preparation for Crankcase cover (right)
Refer to “KICK AXLE, SHIFT SHAFT AND
removalPRIMARY DRIVE GEAR” section.
1 Water pump housing cover 1
2 Impeller shaft gear 1
3 Dowel pin 1Refer to “REMOVAL POINTS”.
4 Plain washer 1
5 Impeller shaft assembly 1
6 Bearing 1
Refer to “REMOVAL POINTS”.
7 Oil seal 2
EC4G0000
WATER PUMP
1
2
Extent of removal:1Impeller shaft removal2Oil seal removal








10 Nm (1.0 m•kg, 7.2 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
1C3-9-30-4C 25/5/04 7:17 PM Page 24

4-50
ENGWATER PUMP
EC444300
Impeller shaft gear
1. Inspect:
9Gear teeth a
Wear/Damage Replace.
EC4H4600
Bearing
1. Inspect:
9Bearing 1
Rotate inner race with a finger.
Rough spot/Seizure Replace.
EC444400
Oil seal
1. Inspect:
9Oil seal 1
Wear/Damage Replace.
EC4G5000
ASSEMBLY AND INSTALLATION
EC4G5111
Oil seal
1. Install:
9Oil seal (inside) 1
9Oil seal (outside) 2
NOTE:
9Apply the lithium soap base grease on the oil
seal lip.
9Install the oil seal with its manufacture's marks or
numbers facing the crankcase cover (right) 3.
2. Install:
9Bearing 1
NOTE:
Install the bearing by pressing its outer race par-
allel.
1C3-9-30-4C 25/5/04 7:17 PM Page 28

4-52
ENGCDI MAGNETO
Extent of removal Order Part name Q’ty Remarks
CDI MAGNETO REMOVAL
Preparation for Seat and fuel tank Refer to “SEAT, FUEL TANK AND
removal SIDE COVERS” section.
Bolt [Radiator (left)] Refer to “RADIATOR” section.
Disconnect the CDI magneto lead.
1 Crankcase cover (left) 1
2 Nut (rotor) 1 Use special tool.
3 Rotor 1 Refer to “REMOVAL POINTS”.
4 Stator 1
5 Woodruff key 1
EC4L0000
CDI MAGNETO
1
Extent of removal:1CDI magneto removal



7 Nm (0.7 m•kg, 5.1 ft•lb)
56 Nm (5.6 m•kg, 40 ft•lb)
5 Nm (0.5 m•kg, 3.6 ft•lb)
1C3-9-30-4C 25/5/04 7:18 PM Page 32

4-55
ENGCDI MAGNETO
7. Connect:
9CDI magneto lead 1
Refer to “CABLE ROUTING DIAGRAM”
section in the CHAPTER 2.
8. Install:
9Gasket [crankcase cover (left)]
9Crankcase cover (left) 1
9Screw [crankcase cover (left)] 2
NOTE:
Tighten the screws in stage, using a crisscross
pattern.
5 Nm (0.5 m•kg, 3.6 ft•lb)
1C3-9-30-4C 25/5/04 7:18 PM Page 38

4-61
ENGCRANKCASE AND CRANKSHAFT
Extent of removal Order Part name Q’ty Remarks
CRANKCASE AND CRANKSHAFT
REMOVAL
Preparation for Engine Refer to “ENGINE REMOVAL”section.
removal Piston Refer to “
CYLINDER HEAD, CYLINDER
AND PISTON
” section.
Primary drive gear
Kick idle gearRefer to “
KICK AXLE, SHIFT SHAFT AND
Stopper leverPRIMARY DRIVE GEAR”section.
Rotor and stator Refer to “CDI MAGNETO” section.
1 Segment 1 Refer to “REMOVAL POINTS”.
2 Bolt [L=45 mm (1.77 in)] 6
3 Bolt [L=55 mm (2.17 in)] 4
4 Bolt [L=65 mm (2.56 in)] 1
5 Bolt [L=75 mm (2.95 in)] 1
6 Holder 1
7 Crankcase (right) 1 Use special tool.
8 Crankcase (left) 1 Refer to “REMOVAL POINTS”.
9 Crankshaft 1 Use special tool.
Refer to “REMOVAL POINTS”.
10 Oil seal 2
11 Bearing 2 Refer to “REMOVAL POINTS”.





EC4N0000
CRANKCASE AND CRANKSHAFT
12
3
Extent of removal:1Crankcase separation2Crankshaft removal
3Crankshaft bearing removal



30 Nm (3.0 m•kg, 22 ft•lb)10 Nm (1.0 m•kg, 7.2 ft•lb)
20 Nm (2.0 m•kg, 14 ft•lb)
14 Nm (1.4 m•kg, 10 ft•lb)
1C3-9-30-4D 25/5/04 7:15 PM Page 12

4-62
ENGCRANKCASE AND CRANKSHAFT
EC4N3000
REMOVAL POINTS
EC4N3212
Crankcase
1. Remove:
9Crankcase (right) 1
Use the crankcase separating tool 2.
NOTE:
9Make appropriate bolts 3as shown available
by yourself and attach the tool with them.
9Fully tighten the tool holding bolts, but make
sure the tool body is parallel with the case. If
necessary, one screw may be backed out
slightly to level tool body.
9As pressure is applied, alternately tap on the
front engine mounting boss and transmission
shafts.
cC
Use soft hammer to tap on the case half.
Tap only on reinforced portions of case. Do
not tap on gasket mating surface. Work
slowly and carefully. Make sure the case
halves separate evenly. If one end “hangs
up”, take pressure off the push screw, re-
align, and start over. If the cases do not
separate, check for a remaining case
screw or fitting. Do not force.
Rotor puller:
YU-1362-A/90890-01362
1C3-9-30-4D 25/5/04 7:15 PM Page 14