2016 YAMAHA WR 450F suspension

MAINTENANCE AFTER BREAK-IN
1-31
EAS2GC1055
MAINTENANCE AFTER BREAK-IN
After a break-in, perform careful maintenance
to get ready for the next practice or race.
Refer to “PRE-OPERATION INSPECTION
AND MAINTENANCE” on page 3-9.
EAS2GC1056MAJOR MAINTENANCE
1. For the engine• Leaks around the engineCheck for pressure l eaks from the cylinder
head or the cylinder, oil leaks from the
crankcase or the case cover, leaks from the
coolant system, and other leaks.
• Check that the valve, the cylinder head, the cylinder, the piston, and the piston ring fit
one another, and that contact between the
valve and the cylinder head, and that be-
tween the cylinder and the piston are cor-
rect.
• Engine oil change Drain the oil, and check for dirt and foreign
materials such as metal chips. (If any foreign
material is mixed, disassemble and check
the crankcase.)
Pour the specified amount of the recom-
mended oil.
• AC magneto
Check for looseness in mounted areas of
the rotor and the stator.
Check that the connector is not being dis-
connected.
• Silencer Check the main body and stay for cracks.
Check for leaks.
• Mounting bolts and nuts Check for looseness in mounted areas of
parts, as well as engine mounting bolts and
engine brackets.
2. For the chassis
• Check welds and mounted areas of the frame, the swingarm, the link, the bracket,
and so on, for looseness and cracks.
• Wheel (s) Check the wheel for runout. Check the
spoke for looseness.
• Brake(s) Check the brake disc mounting bolt for
looseness.
Check that the reservoir contains the speci-
fied amount of brake fluid. Check for leaks. • Cable
Grease and adjust cables.
•Drive chain
Lubricate the drive chain and adjust its ten-
sion.
• Fuel tank
Clean the inside of the fuel tank. Check for
leaks.
• Suspension
Check for oil leaks in the front fork or the rear
shock absorber. Check that the mounted
conditions are good.
• Sprocket Check for looseness in the sprocket mount-
ed on the rear wheel.
• Mounting bolts and nuts
Check mounted areas for looseness.
ECA
NOTICE
After a break-in or before each race, always
check the points shown in “TORQUE-
CHECK POINTS” for tightening torques and
retighten them. (Refer to “TORQUE-CHECK
POINTS” on page 1-32.)
• Greasing and oilingAlways grease or oil the specified points.

TORQUE-CHECK POINTS
1-32
EAS2GC1057
TORQUE-CHECK POINTS
Frame constructionFrame to rear frame
Frame to engine protector
Combined seat and fuel tank Fuel tank to frame
Engine mounting Frame to engine
Engine bracket to engine
Engine bracket to frame
Seat Seat 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 Link Assembly of links
Link to frame
Link to rear shock absorber
Link to swingarm
Mounting of rear shock absorber Rear shock absorber and frame
Mounting of swingarm Tightening of pivot shaft
Wheel (s) Mounting of wheel Front Tightening of wheel axle
Tightening of axle holder
Tightening of spoke nipple
Rear Tightening of wheel axle Wheel to rear wheel sprocket
Tightening of spoke nipple
Brake(s) Front Brake caliper to front fork
Brake disc to wheel
Tightening of union bolt
Brake master cylinder to handle-
bar
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
Shift pedal Shift pedal to shift shaft

CHASSIS SPECIFICATIONS
2-8
Rear brakeType Hydraulic single disc brake
Operation Right foot operation
Brake pedal position 5.0 mm (0.20 in)
Rear disc brake
Disc outside diameter  thickness 245.0  4.0 mm (9.65  0.16 in)
Brake disc thickness limit 3.5 mm (0.14 in)
Brake disc runout limit (as measured on wheel) 0.15 mm (0.0059 in)
Brake pad lining thickness 6.4 mm (0.25 in)
Limit 1.0 mm (0.04 in)
Master cylinder inside diameter 11.0 mm (0.43 in)
Caliper cylinder inside diameter 25.40 mm (1.00 in)
Specified brake fluid DOT 4
Steering Steering bearing type Taper roller bearing
Center to lock angle (left) 43.0 °
Center to lock angle (right) 43.0 °
Front suspension
Type Telescopic fork
Spring/shock absorber type Coil spring/Hydraulic damper
Front fork travel 310.0 mm (12.20 in)
Fork spring free length 470.0 mm (18.50 in)
Limit 465.0 mm (18.31 in)
Fork spring installed length 470.0 mm (18.50 in)
Spring rate K1 4.50 N/mm (0.46 kgf/mm, 25.71 lbf/in)
Spring stroke K1 0.0–310.0 mm (0.00–12.20 in)
Inner tube outer diameter 48 mm (1.9 in)
Inner tube bending limit 0.2 mm (0.01 in)
Optional spring available Yes
Recommended oil Yamaha Suspension Oil S1
Quantity 545.0 cm
3 (18.43 US oz, 19.18 Imp.oz)
Rebound damping adjusting positions
Minimum 20 clicks out*
Standard 11 clicks out*
Maximum Fully turned in * With the adjuster fully turned in
Compression damping adjusting positions Minimum 20 clicks out*
Standard 13 clicks out*
Maximum Fully turned in
* With the adjuster fully turned in

CHASSIS SPECIFICATIONS
2-9
Rear suspensionType Swingarm (link suspension)
Spring/shock absorber type Coil spring/Gas-hydraulic damper
Rear shock absorber assembly travel 126.0 mm (4.96 in)
Spring free length 275.0 mm (10.83 in)
Spring installed length 263.0 mm (10.35 in)
Spring rate K1 56.00 N/mm (5.71 kgf/mm, 319.76 lbf/in)
Spring stroke K1 0.0–150.0 mm (0.00–5.91 in)
Optional spring available Yes
Enclosed gas/air pressure (STD) 980 kPa (9.8 kgf/cm
2, 139.4 psi)
Spring preload adjusting positions
Minimum Position in which the spring is turned in 1.5 mm
(0.06 in) from its free length.
Standard Position in which the spring is turned in 12 mm
(0.47 in) from its free length.
Maximum Position in which the spring is turned in 18 mm
(0.71 in) from its free length.
Rebound damping adjusting positions Minimum 30 clicks out*
Standard 14 clicks out*
Maximum Fully turned in
* With the adjuster fully turned in
Compression damping setting
(for fast compression damping)Minimum 2 turns out*
Standard 1-3/4 turns out*
Maximum Fully turned in
* With the adjuster fully turned in
Compression damping setting
(for slow compression damping)Minimum 20 clicks out*
Standard 10 clicks out*
Maximum Fully turned in
* With the adjuster fully turned in
Swingarm Swingarm end free play limit (radial) 1.0 mm (0.04 in)
Swingarm end free play limit (axial) 0.2–0.9 mm (0.01–0.04 in)
Drive chainSize/manufacturer DID520VM2/DAIDO
Number of links 114
Drive chain slack (on a suitable stand) 50.0–60.0 mm (1.97–2.36 in)
15-link length limit 239.3 mm (9.42 in)

3
PERIODIC CHECKS AND ADJUSTMENTS
PERIODIC MAINTENANCE............................................................................. 3-1
INTRODUCTION ........................................................................................ 3-1
PERIODIC MAINTENANCE CHART FOR THE EMISSION
CONTROL SYSTEM ....................... .......................................................... 3-1
GENERAL MAINTENANCE AND LUBRICATION CHART ........................ 3-2
MAINTENANCE INTERVALS FOR COMPETITION USE ......................... 3-4
PRE-OPERATION INSPECTION AND MAINTENANCE ................................. 3-9
GENERAL INSPECTION AND MAINTENANCE........................................ 3-9
ENGINE .......................................................................................................... 3-10
CHECKING THE COOLANT LEVEL ........................................................ 3-10
CHECKING THE COOLING SYSTEM ..................................................... 3-10
CHANGING THE COOLANT.................................................................... 3-10
CHECKING THE RADIATOR CAP .......................................................... 3-11
CHECKING THE RADIATOR CAP VALVE OPENING PRESSURE ....... 3-11
CHECKING THE COOLANT CIRCULATORY SYSTEM FOR LEAKS .... 3-12
ADJUSTING THE CLUTCH LEVER FREE PLAY .................................... 3-12
ADJUSTING THE THROTTLE GRIP FREE PLAY .................................. 3-13
LUBRICATING THE THROTTLE CABLE ................................................ 3-14
CLEANING THE AIR FILTER ELEMENT................................................. 3-14
CHECKING THE THROTTLE BODY JOINT ............................................ 3-15
CHECKING THE BREATHER HOSES .................................................... 3-15
CHECKING THE EXHAUST SYSTEM............................. ........................ 3-15
CHECKING THE FUEL LINE ................................................................... 3-16
CHECKING THE ENGINE OIL LEVEL............................. ........................ 3-16
CHANGING THE ENGINE OIL ................................................................ 3-17
ADJUSTING THE ENGINE IDLING SPEED ......... ................................... 3-19
ADJUSTING THE VALVE CLEARANCE ................................................. 3-20
CLEANING THE SPARK ARRESTER ..................................................... 3-24
CHASSIS ........................................................................................................ 3-25
BLEEDING THE BRAKE SYST EM .......................................................... 3-25
CHECKING THE BRAKE HOSE .............................................................. 3-26
ADJUSTING THE FRONT BRAKE .......................................................... 3-26
ADJUSTING THE REAR BRAKE ............................................................. 3-27
CHECKING THE FRONT BR AKE PADS ................................................. 3-27
CHECKING THE REAR BRAKE PADS ........................... ........................ 3-29
CHECKING THE REAR BRAKE PAD INSULATOR ................................ 3-30
CHECKING THE BRAKE FLUID LEVEL.................................................. 3-30
ADJUSTING THE DRIVE CHAIN SLACK ................................................ 3-31
CHECKING THE FRONT FORK LEGS ................................................... 3-31
CHECKING THE FRONT FORK PROTECTOR GUIDE .......................... 3-32
CLEANING THE FRONT FORK OI L SEAL AND DUST SEAL ................ 3-32
AIR BLEEDING FROM FRONT FORK .................................................... 3-32
ADJUSTING THE FRONT FORK LEGS .................................................. 3-33
CHECKING THE SWINGARM OPERATION ........................................... 3-34
CHECKING THE REAR SUSPENSION ................................................... 3-34

PERIODIC MAINTENANCE
3-7
BRAKESAdjust lever posi-
tion and pedal
height
Lubricate pivot
point
Check brake disc
surface
Check fluid level
and leakage
Retighten brake
disc bolts, caliper
bolts, master cylin-
der bolts and union
bolts
Replace pads
Replace brake flu-
id Every one year
FRONT FORKS Inspect and adjust
Replace oil Yamaha Suspension Oil S1
Replace oil seal
FRONT FORK OIL
SEAL AND DUST
SEAL Clean and lube Lithium-soap-based grease
PROTECTOR
GUIDE
Replace
REAR SHOCK AB-
SORBER (After
rain
ride)
Inspect and adjust
Lube Molybdenum disulfide grease
Retighten
DRIVE CHAIN
GUARD AND ROLL-
ERS
Inspect
DRIVE CHAIN
STOPPER Inspect ITEM
After
break- in Every
race Every
third (or
500
km) Every
fifth (or
1,000 km) As re-
quired Remarks

CHASSIS
3-33
3. Tighten:• Air bleed screw
EAS2GC1115ADJUSTING THE FRONT FORK LEGSEWA
WARNING
• Always adjust the left and right front forks evenly. If this is not done, the vehicle may
have poor stability.
• Securely support the vehicle so that there
is no danger of it falling over.
Rebound damping
ECA
NOTICE
Do not turn the adjuster forcibly beyond its
adjusting range.
1. Adjust: • Rebound damping
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Turn the adjuster “1” in the direction of “a” or
“b” to make an adjustment.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
Compression dampingECA
NOTICE
Do not turn the adjuster forcibly beyond its
adjusting range.
1. Adjust:• Compression damping
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Turn the adjuster “1” in the direction of “a” or “b” to make an adjustment.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
Air bleed screw1.3 Nm (0.13 m·kgf, 0.94 ft·lbf)
Direction “a” Rebound damping is increased (sus-
pension is harder).
Direction “b” Rebound damping is decreased (sus-
pension is softer).
Rebound damping adjusting posi-
tionsMaximumFully turned in
Standard 11 clicks out*
Minimum 20 clicks out*
* With the adjuster fully turned in
T R..
1
Direction “a” Compression damping is increased
(suspension is harder).
Direction “b” Compression damping is decreased
(suspension is softer).
Compression damping adjusting
positions Maximum Fully turned in
Standard 13 clicks out*
Minimum 20 clicks out*
* With the adjuster fully turned in
1
a b
ab
1

CHASSIS
3-34
EAS2GC1116CHECKING THE SWINGARM OPERATION
1. Check:• Swingarm smooth action
• Swingarm free playRefer to “SWINGARM” on page 5-65.
EAS2GC1117CHECKING THE REAR SUSPENSION
1. Stand the vehicle upright on a level surface.
EWA
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Check:• Rear shock absorber assemblyGas leaks/oil leaks  Replace the rear
shock absorber assembly.
Refer to “REAR SHOCK ABSORBER AS-
SEMBLY” on page 5-58.
3. Check: • Rear shock absorber assembly smooth ac-tion
• Rear suspension link smooth action Sit astride the seat and shake your body up
and down several times to check whether
the rear shock absorber assembly operates
smoothly.
Unsmooth operation  Correct or replace.
Refer to “REAR SHOCK ABSORBER AS-
SEMBLY” on page 5-58.
EAS2GC1118ADJUSTING THE REAR SHOCK ABSORB-
ER ASSEMBLY
Use a suitable stand to raise the rear wheel off
the ground.
EWA
WARNING
Securely support the vehicle so that there is
no danger of it falling over. Spring preload
ECA
NOTICE
Do not turn the adjuster forcibly beyond its
adjusting range.
1. Remove:
• Rear frameRefer to “REAR SHOCK ABSORBER AS-
SEMBLY” on page 5-58.
2. Adjust: • Spring preload
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Loosen the locknut “1”.
b. Loosen the adjuster “2” until there is some clearance between the spring and the ad-
juster.
c. Measure the spring free length “a”.
d. Turn the adjuster in the direction of “b” or “c” to make an adjustment.
Direction “b”Spring preload is increased (suspen-
sion is harder).
Direction “c” Spring preload is decreased (suspen-
sion is softer).
Spring preload adjusting positionsMinimum Position in which the spring is
turned in 1.5 mm (0.06 in) from
its free length.
Standard Position in which the spring is
turned in 12 mm (0.47 in) from its
free length.
Maximum Position in which the spring is
turned in 18 mm (0.71 in) from its
free length.