relay YAMAHA YZ450F 2007 Owners Manual

SPEC
2 - 16
NOTE:
- marked portion shall be checked for torque tightening after break-in or before each race.Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Rear wheel axle and nut M20 × 1.5 1 125 12.5 90
Driven sprocket and wheel hub M8 × 1.25 6 42 4.2 30
Nipple (spoke)—72 3 0.3 2.2
Disc cover and rear brake caliper M6 × 1.0 2 10 1.0 7.2
Protector and rear brake caliper M6 × 1.0 2 7 0.7 5.1
Chain puller adjust bolt and locknut M8 × 1.25 2 19 1.9 13
Engine mounting:
Engine upper bracket and frame M10 × 1.25 4 55 5.5 40
Engine lower bracket and frame M8 × 1.25 4 34 3.4 24
Engine and engine bracket (front) M10 × 1.25 1 53 5.3 38
Engine and engine bracket (upper) M10 × 1.25 1 55 5.5 40
Engine and frame (lower) M10 × 1.25 1 53 5.3 38
Engine guard M6 × 1.0 1 10 1.0 7.2
Engine skid plate mounting M6 × 1.0 3 10 1.0 7.2
CDI unit bracket mounting M6 × 1.0 2 7 0.7 5.1
Cable guide and CDI unit bracket M5 × 0.8 2 4 0.4 2.9
Cable guide and frame M5 × 0.8 1 5 0.5 3.6
Pivot shaft and nut M16 × 1.5 1 85 8.5 61
Relay arm and swingarm M14 × 1.5 1 70 7.0 50
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 (upper) M8 × 1.25 1 32 3.2 23
Rear frame and frame (lower) M8 × 1.25 2 32 3.2 23
Swingarm and brake hose holder M5 × 0.8 4 2 0.2 1.4
Swingarm and patch M4 × 0.7 4 2 0.2 1.4
Drive chain tensioner mounting (upper) M8 × 1.25 1 16 1.6 11
Drive chain tensioner mounting (lower) M8 × 1.25 1 16 1.6 11
Chain support and swingarm M6 × 1.0 3 7 0.7 5.1
Seal guard and swingarm M5 × 0.8 4 6 0.6 4.3
Fuel tank mounting boss and frame M10 × 1.25 1 20 2.0 14
Fuel tank mounting M6 × 1.0 2 9 0.9 6.5
Fuel tank and fuel cock M6 × 1.0 2 4 0.4 2.9
Fuel tank and seat set bracket M6 × 1.0 1 7 0.7 5.1
Fuel tank and fuel tank bracket M6 × 1.0 4 7 0.7 5.1
Seat mounting M8 × 1.25 2 23 2.3 17
Side cover mounting M6 × 1.0 2 7 0.7 5.1
Air scoop and fuel tank M6 × 1.0 6 7 0.7 5.1
Air scoop and radiator panel (lower) M6 × 1.0 2 7 0.7 5.1
Front fender mounting M6 × 1.0 4 7 0.7 5.1
Rear fender mounting (front) M6 × 1.0 2 7 0.7 5.1
Rear fender mounting (rear) M6 × 1.0 2 16 1.6 11
Number plate M6 × 1.0 1 7 0.7 5.1
MAINTENANCE SPECIFICATIONS

3 - 3
INSP
ADJ
MAINTENANCE INTERVALS
FRONT FORK OIL SEAL AND DUST
SEAL
Clean and lube Lithium base grease
PROTECTOR GUIDE
Replace
REAR SHOCK ABSORBER
(After
rain ride)
Inspect and adjust
LubeMolybdenum disulfide
grease
Replace spring seat Every one year
Retighten
CHAIN GUARD AND ROLLERS
Inspect
SWINGARM
Molybdenum disulfide
grease
Inspect, lube and retighten
RELAY ARM, CONNECTING ROD
Molybdenum disulfide
grease
Inspect, lube and retighten
STEERING HEAD
Inspect free play and retighten
Clean and lube Lithium base grease
Replace bearing
TIRE, WHEELS
Inspect air pressure, wheel run-out,
tire wear and spoke looseness
Retighten sprocket bolt
Inspect bearings
Replace bearings
Lubricate Lithium base grease
THROTTLE, CONTROL CABLE
Yamaha cable lube or
SAE 10W-30 motor oil Check routing and connection
Lubricate
HOT STARTER, CLUTCH LEVER
Inspect free playItemAfter
break-inEvery
race
Every
third
(or
500 km)Every
fifth
(or
1,000 km)As re-
quiredRemarks

5 - 54
CHASSWINGARM
EC570000
SWINGARM
Extent of removal:
1 Swingarm removal
Extent of removal Order Part name Q’ty Remarks
SWINGARM REMOVAL
WARNING
Support the machine securely so there is no
danger of it falling over.
Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Brake hose holder
Refer to “FRONT BRAKE AND REAR
BRAKE” section.
Rear caliper
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
1

5 - 55
CHASSWINGARM
EC578000
SWINGARM DISASSEMBLY
Extent of removal:
1 Swingarm disassembly
2 Connecting rod removal and disassembly
3 Relay arm removal and disassembly
Extent of removal Order Part name Q’ty Remarks
SWINGARM DISASSEMBLY
1 Cap 2 Refer to “REMOVAL POINTS”.
2 Relay arm 1
3 Connecting rod 1
4 Collar 2
5 Oil seal 2
6 Thrust bearing 2
7 Bush 2
8 Oil seal 8
9 Bearing 10 Refer to “REMOVAL POINTS”.
1
2
32
3

5 - 56
CHASSWINGARM
EC573000
REMOVAL POINTS
Cap
1. Remove:
•Cap (left) 1
NOTE:
Remove with a slotted-head screwdriver
inserted under the mark a on the cap (left).
EC573200
Bearing
1. Remove:
•Bearing 1
NOTE:
Remove the bearing by pressing its outer race.
EC574010
INSPECTION
Wash the bearings, bushes and collars in a
solvent.
EC574111
Swingarm
1. Inspect:
•Bearing 1
•Bush 2
Free play exists/unsmooth revolution/rust
→ Replace bearing and bush as a set.
2. Inspect:
•Oil seal 3
Damage → Replace.
Relay arm
1. Inspect:
•Bearing 1
•Collar 2
Free play exists/unsmooth revolution/rust
→ Replace bearing and collar as a set.
2. Inspect:
•Oil seal 3
Damage → Replace.

5 - 57
CHASSWINGARM
Connecting rod
1. Inspect:
•Bearing 1
•Collar 2
Free play exists/unsmooth revolution/rust
→ Replace bearing and collar as a set.
2. Inspect:
•Oil seal 3
Damage → Replace.
EC575000
ASSEMBLY AND INSTALLATION
Bearing and oil seal
1. Install:
•Bearing 1
•Oil seal 2
To swingarm.
NOTE:
•Apply the molybdenum disulfide grease on
the bearing when installing.
•Install the bearing by pressing it on the side
having the manufacture’s marks or numbers.
•First install the outer and then the inner bear-
ings to a specified depth from inside.
Installed depth of bearings:
Outer
a: Zero mm (Zero in)
Inner
b: 6.5 mm (0.26 in)
2. Install:
•Bearing 1
•Plain washer 2
•Oil seal 3
To relay arm.
NOTE:
•Apply the molybdenum disulfide grease on
the bearing when installing.
•Install the bearing by pressing it on the side
having the manufacture’s marks or numbers.
•Apply the molybdenum disulfide grease on
the plain washer.
Installed depth of bearings
a:
Zero mm (Zero in)

5 - 58
CHASSWINGARM
3. Install:
•Bearing 1
•Oil seal 2
To connecting rod.
NOTE:
•Apply the molybdenum disulfide grease on
the bearing when installing.
•Install the bearing by pressing it on the side
having the manufacture’s marks or numbers.
Installed depth of bearings
a:
Zero mm (Zero in)
Swingarm
1. Install:
•Bush 1
•Thrust bearing 2
•Oil seal 3
•Collar 4
To swingarm 5.
NOTE:
Apply the molybdenum disulfide grease on the
bushes, thrust bearings, oil seal lips and con-
tact surfaces of the collar and thrust bearing.
2. Install:
•Collar 1
•Washer 2
To relay arm 3.
NOTE:
Apply the molybdenum disulfide grease on the
collars and oil seal lips.

5 - 59
CHASSWINGARM
3. Install:
•Collar 1
To connecting rod 2.
NOTE:
Apply the molybdenum disulfide grease on the
collar and oil seal lips.
4. Install:
•Connecting rod 1
•Bolt (connecting rod) 2
•Plain washer 3
•Nut (connecting rod) 4
To relay arm 5.
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
T R..80 Nm (8.0 m · kg, 58 ft · lb)
5. Install:
•Relay arm 1
•Bolt (relay arm) 2
•Plain washer 3
•Nut (relay arm) 4
To swingarm.
NOTE:
•Apply the molybdenum disulfide grease on
the bolt circumference and threaded portion.
•Do not tighten the nut yet.
6. Install:
•Swingarm 1
•Pivot shaft 2
NOTE:
•Apply the molybdenum disulfide grease on
the pivot shaft.
•Insert the pivot shaft from right side.
T R..85 Nm (8.5 m · kg, 61 ft · lb)
7. Check:
•Swingarm side play a
Free play exists → Replace thrust bear-
ing.
•Swingarm up and down movement b
Unsmooth movement/binding/rough
spots → Grease or replace bearings,
bushes and collars.

5 - 60
CHASSWINGARM
8. Install:
•Bolt (connecting rod) 1
•Plain washer 2
•Nut (connecting rod) 3
NOTE:
•Apply the molybdenum disulfide grease on
the bolt.
•Do not tighten the nut yet.
9. Install:
•Bolt (rear shock absorber-relay arm) 1
•Nut (rear shock absorber-relay arm) 2
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
T R..53 Nm (5.3 m · kg, 38 ft · lb)
10. Tighten:
•Nut (connecting rod) 1
T R..80 Nm (8.0 m · kg, 58 ft · lb)
11. Tighten:
•Nut (relay arm) 1
T R..70 Nm (7.0 m · kg, 50 ft · lb)
12. Install:
•Cap 1
NOTE:
Install the cap (right) with its mark a facing
forward.

5 - 62
CHASREAR SHOCK ABSORBER
EC580000
REAR SHOCK ABSORBER
Extent of removal:
1 Rear shock absorber removal
2 Rear shock absorber disassembly
Extent of removal Order Part name Q’ty Remarks
REAR SHOCK ABSORBER
REMOVAL
WARNING
Support the machine securely so there is no
danger of it falling over.Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Seat Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section in the CHAPTER 4.
Silencer Refer to “EXHAUST PIPE AND
SILENCER” section in the CHAPTER 4.
1 Clamp (air filter joint) 1 Only loosening.
2Rear frame 1
3 Bolt (rear shock absorber-relay
arm)1 Hold the swingarm.
4 Bolt (rear shock absorber-frame) 1
5 Rear shock absorber 1
6 Locknut 1 Only loosening.
7 Adjuster 1 Only loosening.
8 Spring seat 2
1
2