2014 YAMAHA YZ450F oil

SHIFT SHAFT
5-49
EAS1SL1254
SHIFT SHAFT
Removing the shift shaft and stopper lever
OrderPart nameQ’tyRemarks
Primary driven gearRefer to “CLUTCH” on page 5-37.
1Shift pedal1
2Shift shaft1
3Oil seals1
4Collars1
5Shift shaft spring1
6Roller1
7Shift guide1
8Shift lever assembly1
9Shift lever1
10Pawl2
11Pawl pin2
12Spring2
13Stopper lever1
LS
1 3
10 Nm (1.0 m kgf, 7.2 ft lbf)
13
15 14
10 Nm (1.0 m kgf, 7.2 ft lbf)
30 Nm (3.0 m kgf, 22 ft lbf)
LT
610 11 12
118
1210
4
25
LT
7
LT
E
10 Nm (1.0 mkgf, 7.2 ftIbf)T.R.

SHIFT SHAFT
5-52
EAS1SL1260INSTALLING THE STOPPER LEVER
1. Install:
• Torsion spring “1”
• Collar “2”
• Stopper lever “3”
• Bolt (stopper lever) “4”
EAS1SL1261INSTALLING THE SEGMENT
1. Install:
• Segment “1”
• Segment bolt
TIP
• Align the notch “a” on the segment with the
pin “b” on the shift cam.
• With the stopper lever pushed down, install
the segment.
ECA1DX1022
NOTICE
If the segment gets an impact, it may be
damaged. Take care not to give an impact to
it when tightening the bolt.
EAS1SL1262
INSTALLING THE SHIFT GUIDE AND SHIFT
LEVER ASSEMBLY
1. Install:
• Spring “1”
• Pawl pin “2”
•Pawl “3”
(to the shift lever “4”)
TIP
Apply the engine oil on the spring, pawl pin and
pawl.
2. Install:
• Shift lever assembly “1”
(to the shift guide “2”)
3. Install:
• Shift lever assembly “1”
• Shift guide “2”
TIP
• The shift lever assembly is installed at the
same time as the shift guide.
• Apply the engine oil on the segment bolt shaft.
Bolt (stopper lever)
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
LOCTITE®
Segment bolt
30 Nm (3.0 m·kgf, 22 ft·lbf)
T R..
42
13
LT
T R..
1
2
1 2

SHIFT SHAFT
5-53
4. Tighten:
• Shift guide bolt “1”
EAS1SL1263INSTALLING THE SHIFT SHAFT
1. Install:
• Roller “1”
• Shift shaft spring “2” (to shift shaft)
• Collar “3” (to shift shaft)
• Shift shaft “4”
TIP
Apply the engine oil on the roller and shift shaft.
2. Install:
• Oil seal
EAS1SL1264
INSTALLING THE SHIFT PEDAL
1. Install:
• Shift pedal “1”
• Shift pedal bolt “2”
TIP
Align the punch mark “a” on the shift shaft with
the punch mark “b” in the shift pedal.
Shift guide bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
LOCTITE®
T R..
1 1
LT
E
E
1
23
4
New
Shift pedal bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)T R..
a
12b

OIL PUMP AND BALANCER GEAR
5-54
EAS1SL1265
OIL PUMP AND BALANCER GEAR
Removing the oil pump
OrderPart nameQ’tyRemarks
Primary driven gearRefer to “CLUTCH” on page 5-37.
Right crankcase coverRefer to “CLUTCH” on page 5-37.
1Oil pump assembly1
2Oil pump cover1
3Outer rotor1
4Dowel pin1
5Inner rotor1
6Oil pump drive shaft1
7Rotor housing1
For installation, reverse the removal proce-dure.
2.0 Nm (0.20 mkgf, 1.4 ftIbf)T.R.
5 Nm (0.5 mkgf, 3.6 ftIbf)T.
R
.
LT
E
3
2
1
4
5
7
6

OIL PUMP AND BALANCER GEAR
5-55
Removing the balancer
OrderPart nameQ’tyRemarks
Primary driven gearRefer to “CLUTCH” on page 5-37.
Right crankcase coverRefer to “CLUTCH” on page 5-37.
StatorRefer to “AC MAGNETO” on page 5-59.
1Nut (balancer)1
2Nut (primary drive gear)1
3Nut (balancer shaft driven gear)1
4Lock washer1
5Balancer1
6Straight key1
7Conical washer1
8Primary drive gear1
9Balancer shaft drive gear1
10Lock washer1
11Balancer weight gear1
For installation, reverse the removal proce-dure.
45 Nm (4.5 mkgf, 33 ftIbf)T.R.
100 Nm (10 mkgf, 72 ftlbf)T.R.
50 Nm (5.0 mkgf, 36 ftIbf)T.R.
New

OIL PUMP AND BALANCER GEAR
5-56
EAS1SL1266REMOVING THE BALANCER
1. Straighten the lock washer tab.
2. Loosen:
• Balancer nut “1”
• Primary drive gear nut “2”
• Balancer weight gear nut “3”
TIP
Place an aluminum plate “a” between the teeth
of the balancer drive gear “4” and balancer
weight gear “5”.
EAS1SL1267CHECKING THE PRIMARY DRIVE GEAR,
BALANCER SHAFT DRIVE GEAR, AND
BALANCER WEIGHT GEAR
1. Check:
• Primary drive gear “1”
• Balancer shaft drive gear “2”
• Balancer weight gear “3”
Wear/damage  Replace.
EAS1SL1268CHECKING THE BALANCER
1. Check:
•Balancer
Crack/damage  Replace.
EAS1SL1269CHECKING THE OIL PUMP
1. Check:
• Oil pump drive gear
• Oil pump driven gear
• Oil pump housing
• Oil pump housing cover
Cracks/damage/wear  Replace the defec-
tive part(s).
2. Measure:
• Inner-rotor-to-outer-rotor-tip clearance “a”
• Outer-rotor-to-oil-pump-housing clearance
“b”
• Oil-pump-housing-to-inner-rotor-and-outer-
rotor clearance “c”
Out of specification  Replace the oil pump.
1
5
4
2
a
43
a
5
Inner-rotor-to-outer-rotor-tip
clearance
Less than
0.150 mm (0.0059 in)
Outer-rotor-to-oil-pump-housing
clearance
0.13–0.18 mm (0.0051–0.0071 in)
Oil-pump-housing-to-inner-and-
outer-rotor

clearance
0.06–0.11 mm (0.0024–0.0043 in)

OIL PUMP AND BALANCER GEAR
5-57
3. Check:
• Oil pump operation
Rough movement  Repeat steps (1) and
(2) or replace the defective part(s).
EAS1SL1270ASSEMBLING THE OIL PUMP
1. Install:
• Oil pump drive shaft “1”
• Inner rotor “2”
• Dowel pin “3”
TIP
• Apply the engine oil on the oil pump drive
shaft and inner rotor.
• Fit the dowel pin into the groove in the inner
rotor.
2. Install:
• Outer rotor “1”
TIP
Apply the engine oil on the outer rotor.
3. Install:
• Oil pump cover “1”
• Oil pump cover screw “2”
EAS1SL1271INSTALLING THE OIL PUMP AND BALANC-
ER GEAR
1. Install:
• Oil pump assembly “1”
• Oil pump assembly bolt “2”
ECA1DX1023
1. Inner rotor
2. Outer rotor
3. Oil pump housing
b
a 1
2
3
c
21
3
Oil pump cover screw
2 Nm (0.2 m·kgf, 1.4 ft·lbf)
Oil pump assembly bolt
5 Nm (0.5 m·kgf, 3.6 ft·lbf)
LOCTITE®
1
E
T R..
2
1
T R..
1
2
LT

OIL PUMP AND BALANCER GEAR
5-58
NOTICE
After tightening the bolts, make sure that
the oil pump turns smoothly.
2. Install:
• Balancer weight gear “1”
TIP
Install the balancer weight gear and balancer
shaft with their lower splines “a” aligning with
each other.
3. Install:
• Balancer drive gear “1”
TIP
• Align the punched mark “a” on the balancer
drive gear with the punched mark “b” on the
balancer weight gear.
• Install the balancer drive gear and crankshaft
with the lower splines “c” aligning with each
other.
4. Install:
• Lock washer “1”
• Balancer weight gear nut “2”
• Primary drive gear “3”
• Conical washer “4”
• Primary drive gear nut “5”
• Straight key “6”
•Balancer “7”
• Lock washer “8”
• Balancer nut “9”
TIP
• Apply engine oil to the contact surface and
threaded portion of the primary drive gear nut.
• Apply engine oil to the contact surfaces of the
conical washer.
• Place an aluminum plate “a” between the
teeth of the balancer drive gear “10” and bal
-
ancer weight gear “11”.
• Install the conical washer with its convex sur-
face “b” outward.
5. Bend the lock washer tab.
Balancer weight gear nut
50 Nm (5.0 m·kgf, 36 ft·lbf)
Primary drive gear nut
100 Nm (10 m·kgf, 72 ft·lbf)
New
T R..
New
T R..
Balancer nut
45 Nm (4.5 m·kgf, 33 ft·lbf)
New
T R..
1
2 11
10
a
3 45
1011
a
b
3