2007 YAMAHA YZ450F water pump

4 - 60
ENG
OIL FILTER, WATER PUMP AND CRANKCASE COVER
(RIGHT)
EC4G5220
Impeller shaft
1. Install:
Impeller shaft 1
Plain washer 2
Impeller 3
NOTE:
Take care so that the oil seal lip is not dam-
aged or the spring does not slip off its posi-
tion.
When installing the impeller shaft, apply the
engine oil on the oil seal lip, bearing and
impeller shaft. And install the shaft while
turning it.
Hold the impeller shaft on its width across
the flats a with spanners, etc. and install the
impeller.
T R..14 Nm (1.4 m · kg, 10 ft · lb)
Crankcase cover (right)
1. Install:
Dowel pin 1
O-ring 2
Collar 3
Gasket 4
NOTE:
Apply the lithium soap base grease on the O-
ring.
New
New
2. Install:
Crankcase cover (right) 1
Bolt 2
Bolt
NOTE:
Apply the engine oil on the impeller shaft
end.
When installing the crankcase cover onto the
crankcase, be sure that the impeller shaft
end 2 aligns with the balancer end slot 3.
Tighten the bolts in stage, using a crisscross
pattern.
T R..12 Nm (1.2 m · kg, 8.7 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

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ENG
OIL FILTER, WATER PUMP AND CRANKCASE COVER
(RIGHT)
Kick crank
1. Install:
Kick starter 1
Plain washer
Bolt (kick starter)
NOTE:
Install so that there is a clearance a of 8mm
(0.31 in) or more between the kick starter and
frame and that the kick starter does not contact
the crankcase cover when it is pulled.
T R..33 Nm (3.3 m · kg, 24 ft · lb)
2. Install:
Oil tank breather hose 1
Clamp 2
T R..2 Nm (0.2 m · kg, 1.4 ft · lb)
Water pump housing
1. Install:
Dowel pin 1
O-ring 2
NOTE:
Apply the lithium soap base grease on the O-
ring.
New
2. Install:
Water pump housing 1
Bolt (water pump housing) 2
Plain washer 3
Coolant drain bolt 4
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
New
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

4 - 62
ENG
OIL FILTER, WATER PUMP AND CRANKCASE COVER
(RIGHT)
3. Install:
O-ring
Coolant pipe 1
Bolt (coolant pipe) 2
NOTE:
Apply the lithium soap base grease on the O-
ring.
New
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
Oil filter
1. Install:
Oil filter 1
O-ring 2
Oil filter cover 3
Bolt (oil filter cover)
NOTE:
Apply the lithium soap base grease on the O-
ring.
New
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

4 - 63
ENGBALANCER
BALANCER
BALANCER
Extent of removal:
1 Balancer drive gear
2 Balancer
Extent of removal Order Part name Q’ty Remarks
BALANCER REMOVAL
Preparation for removal Clutch housing Refer to “CLUTCH” section.
Crankcase cover (right) Refer to “OIL FILTER, WATER PUMP AND
CRANKCASE COVER (RIGHT)” section.
Stator Refer to “CDI MAGNETO” section.
1 Nut (balancer) 1
Refer to “REMOVAL POINTS”. 2 Nut (primary drive gear) 1
3 Nut (balancer driven gear) 1
4 Lock washer 1
5 Balancer 1
6 Straight key 1
7 Conical washer 1
8 Primary drive gear 1
9 Balancer drive gear 1
10 Lock washer 1
11 Balancer driven gear 1
2
1
2
1

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ENGOIL PUMP
OIL PUMP
OIL PUMP
Extent of removal:
1 Oil pump removal
2 Oil pump disassembly
Extent of removal Order Part name Q’ty Remarks
OIL PUMP REMOVAL AND DIS-
ASSEMBLY
Preparation for removal Clutch housing Refer to “CLUTCH” section.
Crankcase cover (right) Refer to “OIL FILTER, WATER PUMP AND
CRANKCASE COVER (RIGHT)” section.
1 Circlip 1
2 Plate washer 1
3 Oil pump drive gear 1
4 Oil pump assembly 1
5 Dowel pin 2
6 Outer rotor 2 1
7 Circlip 1
8 Inner rotor 2 1
9Pin 1
10 Oil pump cover 1
11 Outer rotor 1 1
12 Inner rotor 1 1
2
1