2016 YAMAHA WR 450F engine

CLUTCH
6-48
5. Install:• Bearing “1”
• Washer “2”
• Circlip “3” To push rod 1 “4”.
TIP
Apply the engine oil on the bearing and washer.
6. Install:• Push rod 2 “1”
•Ball “2”
• Push rod 1 “3”
TIP
Apply the engine oil on the push rod 1, 2 and
ball.
7. Install:
• Pressure plate “1” 8. Install:
• Clutch spring
• Clutch spring bolt
TIP
Tighten the bolts in stages and in a crisscross
pattern.
9. Install:• O-ring “1”
TIP
Apply the lithium-soap-based grease to the O-
ring.
10.Install:• Clutch cover “1”
• Clutch cover bolt
TIP
Tighten the bolts in stages and in a crisscross
pattern.
NewClutch spring bolt10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Clutch cover bolt 10 Nm (1.0 m·kgf, 7.2 ft·lbf)
T R..
New
T R..

KICKSTATER
6-52
3. Install:• Spring guide “1”
TIP
Slide the spring guide into the kick shaft, make
sure the groove “a” in the spring guide fits on
the stopper of the torsion spring.
4. Install:• Kick shaft assembly “1”
TIP
• Before installation, apply molybdenum disul-fide grease to the contacting surfaces of the
kick shaft ratchet wheel guide “2” and the kick
shaft stopper “a”.
• Apply the engine oil on the kick shaft.
• Slide the kick shaft assembly into the crank-
case and make sure the kick shaft stopper “a”
fits into the kick shaft ratchet wheel guide. 5. Install:
• Torsion spring “1”
TIP
Turn the torsion spring clockwise and hook into
the proper hole “a” in the crankcase.
EAS2GC1286INSTALLING THE KICK IDLE GEAR
1. Install:• Kick idle gear “1”
• Washer “2”
• Circlip “3”
TIP
• Apply the engine oil on the kick idle gear inner circumference.
• Install the kick idle gear with its depressed
side “a” toward you.
1
2
a
b
New

SHIFT SHAFT
6-55
EAS2GC1293INSTALLING THE STOPPER LEVER
1. Install:• Torsion spring “1”
• Collar “2”
• Stopper lever “3”
• Bolt (stopper lever) “4”
EAS2GC1294INSTALLING 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.
ECA
NOTICE
If the segment gets an impact, the stopper
lever may be damaged. Take care not to
give an impact to it when tightening the bolt.
EAS2GC1295INSTALLING 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..
2
1
3
4
LT
T R..1
2
1
2

SHIFT SHAFT
6-56
4. Tighten:• Shift guide bolt “1”
EAS2GC1296INSTALLING THE SHIFT SHAFT
1. Install:• Roller “1”
• Shift haft spring “2” (to shift shaft)
• Collar “3” (to shift shaft)
• Shift shaft “4”
TIP
Apply the engine oil on the roller, collar and
shift shaft.
2. Install:• Oil seal
EAS2GC1297INSTALLING 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®
Shift pedal bolt 12 Nm (1.2 m·kgf, 8.7 ft·lbf)
T R..
1
1
LT
E
E
1
2 3
4
New
T R..
a
12 b

OIL PUMP AND BALANCER GEAR
6-60
3. Check:• Oil pump operationRough movement  Repeat steps (1) and
(2) or replace the defective part(s).
EAS2GC1303ASSEMBLING 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”
Inner-rotor-to-outer-rotor-tip
clearance
0.000–0.150 mm (0.0000–0.0059
in)
Limit 0.20 mm (0.0079 in)
Outer-rotor-to-oil-pump-housing
clearance 0.13–0.18 mm (0.0051–0.0071 in)
Limit 0.24 mm (0.0094 in)
Oil-pump-housing-to-inner-and-
outer-rotor clearance 0.06–0.11 mm (0.0024–0.0043 in)
Limit 0.17 mm (0.0067 in)
1. Inner rotor
2. Outer rotor
3. Oil pump housing
b
a
1
2
3
c
Oil pump cover screw
2.0 Nm (0.20 m·kgf, 1.4 ft·lbf)
21
3
1
E
T R..
2
1

OIL PUMP AND BALANCER GEAR
6-61
EAS2GC1304INSTALLING THE OIL PUMP AND BALANC-
ER GEAR
1. Install:• Oil pump assembly “1”
• Oil pump assembly bolt “2”
ECA1DX1023
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 sp lines “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 wash er with its convex sur-
face “b” outward.
Oil pump assembly bolt
5 Nm (0.5 m·kgf, 3.6 ft·lbf)
LOCTITE®
T R..
1
2
LT
Balancer weight gear nut50 Nm (5.0 m·kgf, 36 ft·lbf)
Primary drive gear nut 100 Nm (10 m·kgf, 72 ft·lbf)
Balancer nut 45 Nm (4.5 m·kgf, 33 ft·lbf)
ba
New
T R..
New
T R..
New
T R..

GENERATOR AND STARTER CLUTCH
6-63
EAS2GC1305
GENERATOR AND STARTER CLUTCH
Removing the generator
Order Job/Parts to remove Q’tyRemarks
Drain the engine oil. Refer to “CHANGING THE ENGINE OIL” on
page 3-17.
Seat and fuel tank Refer to “GENERAL CHASSIS” on page 5-1
and “FUEL TANK” on page 8-1.
Disconnect the AC magneto lead.
Clutch cable
Shift pedal Refer to “SHIFT SHAFT” on page 6-53.
1 Cover (Damper assembly) 1
2 Damper assembly 1
3 Left crankcase cover 1
4Gasket 1
5 Dowel pin 2
6 Starter idle gear 1
7 Bearing 1
8 Starter idle gear shaft 1
9 Generator rotor 1
10 Woodruff key 1
T R..
T R..
T R..
5
5 10
87
6
21
13 3
4
11 9
12
T R..
T R..
T R..LT
LT
T R..
T R..
14
LT
LT

GENERATOR AND STARTER CLUTCH
6-66
EAS2GC1308INSTALLING THE STARTER CLUTCH
1. Install:• Stator “1”
• Stator bolt “2”
• Crankshaft position sensor “3”
• Holder “4”
• Crankshaft position sensor bolt “5”
TIP
• Pass the stator coil lead between ribs “a”, and put it in part “b” so that there is no slack.
• Pass crankshaft sensor lead “c” over stator
coil lead “d”.
• Pass the crankshaft sensor lead outside of rib “a” and place the excess end next to boss “e”.
• Make sure that the end surface of holder “f” does not get caught on rib “a”.
• Place the stator coil lead and crankshaft sen-
sor lead inside the U-shaped space “g”of the
holder.
• Tighten the stator bolt using the T25 bit.
• Apply the sealant to the grommet of the AC
magneto lead. 2. Install
• Starter clutch drive gear “1”
TIP
Apply the engine oil on the starter clutch drive
gear inner circumference.
Stator bolt
7 Nm (0.7 m·kgf, 5.1 ft·lbf)
LOCTITE®
Crankshaft position sensor bolt 10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Yamaha bond No. 1215 90890-85505
(Three bond No.1215®)
T R..
T R..
g
d
c
ea
a
b
f
LT