2013 YAMAHA YZ450F steering

CONTENTS
CHAPTER 1
GENERAL INFOR-
MATION
LOCATION OF
IMPORTANT LABELS ..... 1-1
DESCRIPTION ................. 1-5
CONSUMER
INFORMATION................. 1-6
FEATURES....................... 1-7
INCLUDED PARTS .......... 1-9
IMPORTANT
INFORMATION................. 1-9
HANDLING THE
ELECTRONIC PARTS ... 1-10
CHECKING OF
CONNECTION ................ 1-10
SPECIAL TOOLS ........... 1-12
CONTROL
FUNCTIONS ................... 1-17
STARTING
AND BREAK-IN.............. 1-17
TORQUE-CHECK
POINTS........................... 1-19
CLEANING
AND STORAGE ............. 1-20
CHAPTER 2
SPECIFICATIONS
GENERAL
SPECIFICATIONS ............ 2-1
MAINTENANCE
SPECIFICATIONS ............ 2-3
TIGHTENING
TORQUES ...................... 2-11
LUBRICATION
DIAGRAMS .................... 2-17
CABLE ROUTING
DIAGRAM ....................... 2-18
CHAPTER 3
REGULAR INSPEC-
TION AND AD-
JUSTMENTS
MAINTENANCE
INTERVALS ...................... 3-1
PRE-OPERATION
INSPECTION
AND MAINTENANCE ....... 3-5
ENGINE ............................ 3-6
CHASSIS ........................ 3-14
ELECTRICAL ................. 3-24
CHAPTER 4
ENGINE
SEAT
AND SIDE COVERS ......... 4-1
EXHAUST PIPE
AND SILENCER ............... 4-3
RADIATOR ....................... 4-5
CAMSHAFTS.................... 4-8
CYLINDER HEAD........... 4-13
VALVES AND
VALVE SPRINGS ........... 4-17
CYLINDER
AND PISTON .................. 4-21
CLUTCH ......................... 4-25
OIL FILTER ELEMENT
AND WATER PUMP ....... 4-29
BALANCER .................... 4-33
OIL PUMP ....................... 4-35
KICK SHAFT
AND SHIFT SHAFT ........ 4-38
AC MAGNETO................ 4-43
ENGINE REMOVAL ....... 4-45
CRANKCASE
AND CRANKSHAFT ...... 4-50
TRANSMISSION,
SHIFT CAM
AND SHIFT FORK .......... 4-56
CHAPTER 5
CHASSIS
FRONT WHEEL
AND REAR WHEEL .........5-1
FRONT BRAKE
AND REAR BRAKE..........5-6
FRONT FORK .................5-16
HANDLEBAR..................5-24
STEERING ......................5-28
SWINGARM ....................5-32
REAR
SHOCK ABSORBER ......5-37
CHAPTER 6
FUEL SYSTEM
FUEL TANK ......................6-1
THROTTLE BODY ............6-4
CHAPTER 7
ELECTRICAL
ELECTRICAL
COMPONENTS AND
WIRING DIAGRAM ...........7-1
IGNITION SYSTEM...........7-3
THROTTLE POSITION
SENSOR SYSTEM ...........7-6
FUEL INJECTION
SYSTEM............................7-9
FUEL PUMP SYSTEM ....7-35
ELECTRICAL
COMPONENTS...............7-36
CHAPTER 8
TUNING
CHASSIS ..........................8-1

1-6
CONSUMER INFORMATION
CONSUMER INFORMATION
There are two significant reasons for
knowing the serial number of your
machine:
1. When ordering parts, you can
give the number to your Yamaha
dealer for positive identification of
the model you own.
2. If your machine is stolen, the au-
thorities will need the number to
search for and identify your ma-
chine.
VEHICLE IDENTIFICATION
NUMBER
The vehicle identification number "1"
is stamped on the right of the steering
head pipe.
ENGINE SERIAL NUMBER
The engine serial number "1" is
stamped into the elevated part of the
right-side of the engine.
MODEL LABEL
The model label "1" is affixed to the
frame under the rider's seat. This in-
formation will be needed to order
spare parts.

1-12
SPECIAL TOOLS
SPECIAL TOOLS
The proper special tools are necessary for complete and accurate tune-up and assembly. Using the correct special tool will
help prevent damage caused by the use of improper tools or improvised techniques. The shape and part number used for
the special tool differ by country, so two types are provided. Refer to the list provided to avoid errors when placing an order.
• For U.S.A. and Canada, use part number starting with "YM-", "YU-" or "ACC-".
• For others, use part number starting with "90890-".
Tool name/Part number How to use Illustration
Dial gauge and stand
YU-3097, 90890-01252
Stand
YU-1256These tools are used to check each
part for runout or bend.
Crankshaft installing tool
Crankshaft installing pot
YU-90050, 90890-01274
Crankshaft installing bolt
YU-90050, 90890-01275
Spacer (crankshaft installer)
YM-91044, 90890-04081
Adapter (M12)
YU-90063, 90890-01278These tools are used to install the
crankshaft.
Piston pin puller set
YU-1304, 90890-01304 This tool is used to remove the pis-
ton pin.
Radiator cap tester
YU-24460-01, 90890-01325
Radiator cap tester adapter
YU-33984, 90890-01352These tools are used for checking
the cooling system.
Steering nut wrench
YU-33975, 90890-01403 This tool is used when tighten the
steering ring nut to specification.

1-19
TORQUE-CHECK POINTS
TORQUE-CHECK POINTS
Concerning the tightening torque, refer to "TIGHTENING TORQUES" section in the CHAPTER 2.
Frame construction Frame to rear frame
Combined seat and fuel tank Fuel tank to frame
Exhaust system Silencer to rear frame
Engine mounting Frame to engine
Engine bracket to engine
Engine bracket to frame
Steering Steering stem to handlebar Steering stem to frame
Steering stem to upper bracket
Upper bracket to handlebar
Suspension Front Steering stem to front fork Front fork to upper bracket
Front fork to lower bracket
Rear For link type Assembly of links
Link to frame
Link to rear shock absorber
Link to swingarm
Installation of rear shock absorber Rear shock absorber to frame
Installation of swingarm Tightening of pivot shaft
Wheel Installation of wheel Front Tightening of wheel axle
Tightening of axle holder
Rear Tightening of wheel axle
Wheel to rear wheel sprocket
Brake Front Brake caliper to front fork
Brake disc to wheel
Tightening of union bolt
Brake master cylinder to handlebar
Tightening of bleed screw
Tightening of brake hose holder
Rear Brake pedal to frame
Brake disc to wheel
Tightening of union bolt
Brake master cylinder to frame
Tightening of bleed screw
Tightening of brake hose holder
Fuel system Fuel pump to fuel tank

2-9
MAINTENANCE SPECIFICATIONS
CHASSISItem Standard Limit
Steering system: Steering bearing type Taper roller bearing ----
Front suspension: USA, CDN EUROPE, AUS, NZ, ZA Front fork travel 310 mm (12.2 in) ←----
Fork spring free length 470.0 mm (18.5 in) ←465.0 mm
(18.3 in)
Spring rate, STD K = 4.6 N/mm (0.469 kg/ mm, 26.3 lb/in)←
----
Optional spring Yes← ----
Oil capacity 551 cm
3 (19.4 lmp oz,
18.63 US oz) ←
----
Oil grade Suspension oil "S1"←----
Inner tube outer diameter 48 mm (1.89 in)← ----
Front fork top end 0 mm (0 in)←----
Rear suspension: USA, CDN EUROPE, AUS, NZ, ZA
Shock absorber travel 132.0 mm (5.20 in)←----
Spring free length 260.0 mm (10.24 in)←254.8 mm
(10.03 in)
Fitting length 250.0 mm (9.84 in) 246.0 mm (9.69 in) ----
Preload length
1.5–18 mm (0.06–0.71
in) ←
Spring rate, STD K = 56.0 N/mm (5.7 kg/
mm, 319.2 lb/in) K = 54.0 N/mm (5.5 kg/
mm, 308.0 lb/in)----
Optional spring Yes← ----
Enclosed gas pressure 1,000 kPa (10 kg/cm
2,
142 psi) ←
----
Swingarm: Swingarm free play limitEnd ---- 1.0 mm (0.04 in)
Wheel: Front wheel type Spoke wheel ----
Rear wheel type Spoke wheel ----
Front rim size/materia l 21 × 1.60/Aluminum ----
Rear rim size/materia l 19 × 2.15/Aluminum ----
Rim runout limit: Radial ---- 2.0 mm (0.08 in)
Lateral ---- 2.0 mm (0.08 in)
Drive chain: Type/manufacturer DID5 20DMA2 SDH/DAIDO ----
Number of links 113 links + joint ----
Chain slack 50–60 mm (2.0–2.4 in) ----
Chain length (15 links) ---- 242.9 mm (9.563 in)

2-13
TIGHTENING TORQUES
CHASSIS
△- marked portion shall be checked for torque tightening after break-in or before each race.
ItemThread
sizeQ'ty Tightening torque Remarks
△Upper bracket and outer tube M8 4 21 Nm (2.1 m•kg, 15 ft•lb)
△Lower bracket and outer tube M8 4 21 Nm (2.1 m•kg, 15 ft•lb)
△Upper bracket and steering stem M24 1 145 Nm (14.5 m•kg, 105 ft•lb)
△Handlebar upper holder M8 4 28 Nm (2.8 m•kg, 20 ft•lb)
△Handlebar lower holder M10 2 34 Nm (3.4 m•kg, 24 ft•lb)
△Steering ring nut M28 1 Refer to TIP.
Front fork and damper assembly M51 2 30 Nm (3.0 m•kg, 22 ft•lb)
Front fork and adjuster M22 2 55 Nm (5.5 m•kg, 40 ft•lb)Copper
washer
Damper assembly and base valve M42 2 29 Nm (2.9 m•kg, 21 ft•lb)
Adjuster and damper assembly M12 2 29 Nm (2.9 m•kg, 21 ft•lb)
Bleed screw (front fork) and base valve M5 2 1 Nm (0.1 m•kg, 0.7 ft•lb)
△Front fork and front fork protector M6 6 5 Nm (0.5 m•kg, 3.6 ft•lb)
△Front fork protector and brake hose hold-
erM6 2 8 Nm (0.8 m•kg, 5.8 ft•lb)
Throttle grip cap M5 2 4 Nm (0.4 m•kg, 2.9 ft•lb)
Clutch lever holder M6 2 5 Nm (0.5 m•kg, 3.6 ft•lb)
Clutch lever mounting nut M6 1 4 Nm (0.4 m•kg, 2.9 ft•lb)
Clutch lever position lock nut M5 1 5 Nm (0.5 m•kg, 3.6 ft•lb)
△Front brake master cylinder and bracket M6 2 9 Nm (0.9 m•kg, 6.5 ft•lb)
Front brake master cylinder cap M4 2 2 Nm (0.2 m•kg, 1.4 ft•lb)
Brake lever mounting bolt M6 1 6 Nm (0.6 m•kg, 4.3 ft•lb)
Brake lever mounting nut M6 1 6 Nm (0.6 m•kg, 4.3 ft•lb)
Brake lever position locknut M6 1 5 Nm (0.5 m•kg, 3.6 ft•lb)
△Cable guide (front brake hose) and under
bracketM6 1 4 Nm (0.4 m•kg, 2.9 ft•lb)
△Front brake hose union bolt (brake master
cylinder)M10 1 30 Nm (3.0 m•kg, 22 ft•lb)Copper
washer
△Front brake hose union bolt (brake cali-
per)M10 1 30 Nm (3.0 m•kg, 22 ft•lb)Copper
washer
△Front brake caliper and front fork M8 2 28 Nm (2.8 m•kg, 20 ft•lb)
Brake caliper (front and rear) and pad pin
plugM10 2 2 Nm (0.2 m•kg, 1.4 ft•lb)
△Brake caliper (front and rear) and pad pin M10 2 18 Nm (1.8 m•kg, 13 ft•lb)
△Brake caliper (front and rear) and bleed
screwM8 2 6 Nm (0.6 m•kg, 4.3 ft•lb)
△Front wheel axle and axle nut M16 1 105 Nm (10.5 m•kg, 75 ft•lb)
△Front wheel axle holder M8 4 21 Nm (2.1 m•kg, 15 ft•lb)
△Front brake disc and wheel hub M6 6 12 Nm (1.2 m•kg, 8.7 ft•lb)
△Rear brake disc and wheel hub M6 6 14 Nm (1.4 m•kg, 10 ft•lb)
△
Footrest bracket and frame M10 4 55 Nm (5.5 m•kg, 40 ft•lb)TORX

2-15
TIGHTENING TORQUES
1. First, tighten the steering ring nut approximately 38 Nm (3.8 m•kg, 27 ft•lb) by using the steering nut wrench, then loosen
the steering ring nut one turn.
2. Retighten the steering ring nut 7 Nm (0.7 m•kg, 5.1 ft•lb).
ELECTRICALSeat M8 2 22 Nm (2.2 m•kg, 16 ft•lb)
△Side cover M6 4 7 Nm (0.7 m•kg, 5.1 ft•lb)
Heat protector M5 2 4 Nm (0.4 m•kg, 2.9 ft•lb)
△Air scoop and air duct M6 2 7 Nm (0.7 m•kg, 5.1 ft•lb)
Radiator and radiator guard M6 2 10 Nm (1.0 m•kg, 7.2 ft•lb)
△Air scoop and radiator guard M6 2 7 Nm (0.7 m•kg, 5.1 ft•lb)
△Front fender M6 4 10 Nm (1.0 m•kg, 7.2 ft•lb)
△Rear fender (front) M6 3 7 Nm (0.7 m•kg, 5.1 ft•lb)
△Rear fender (rear) M6 2 18 Nm (1.8 m•kg, 13 ft•lb)
△Mud flap — 2 1 Nm (0.1 m•kg, 0.7 ft•lb)
△Number plate M6 1 7 Nm (0.7 m•kg, 5.1 ft•lb)Item
Thread
sizeQ'ty Tightening torque Remarks
ItemThread
sizeQ'ty Tightening torque Remarks
Stator M5 3 8 Nm (0.8 m•kg, 5.8 ft•lb)
Rotor M12 1 65 Nm (6.5 m•kg, 47 ft•lb)
Crankshaft position sensor M6 2 10 Nm (1.0 m•kg, 7.2 ft•lb)
Throttle position sensor M5 1 3 Nm (0.3 m•kg, 2.2 ft•lb)
Injector M5 2 3 Nm (0.3 m•kg, 2.2 ft•lb)
Ignition coil M5 2 4 Nm (0.4 m•kg, 2.9 ft•lb)
Coolant temperature sensor M10 1 16 Nm (1.6 m•kg, 11 ft•lb)
Rectifier/regulator M6 2 7 Nm (0.7 m•kg, 5.1 ft•lb)
Ignition coil bracket M6 2 10 Nm (1.0 m•kg, 7.2 ft•lb)
Intake air pressure sensor M5 1 5 Nm (0.5 m•kg, 3.6 ft•lb)
Atmospheric pressure sensor M5 1 4 Nm (0.4 m•kg, 2.9 ft•lb)
Atmospheric pressure sensor bracket M6 1 7 Nm (0.7 m•kg, 5.1 ft•lb)
Condenser bracket M6 2 7 Nm (0.7 m•kg, 5.1 ft•lb)
Ground lead M5 1 4 Nm (0.4 m•kg, 2.9 ft•lb)
△ECU M5 2 4 Nm (0.4 m•kg, 2.9 ft•lb)
ECU bracket M6 2 7 Nm (0.7 m•kg, 5.1 ft•lb)

2-19
CABLE ROUTING DIAGRAM
1. Fuel tank breather hose
2. Coupler for connecting optional
part
3. Cylinder head breather hose
4. Hose holder
5. Radiator hose 3A. Insert the end of the fuel tank
breather hose into the hole in
the steering stem.
B. Fit the accessory coupler into
the connector to fasten it to the
bracket.
C. Point the end of the cylinder
head breather hose downward.
D. Pass the cylinder head breather
hose through the hose holder,
making sure that the stopper on
the hose contacts the holder.
E. Route the cylinder head breath-
er hose between the frame and
radiator hose 3, and to the out-
side of the AC magneto lead.