2016 YAMAHA WR 450F Owners Manual

SWINGARM
5-65
EAS2GC1216
SWINGARM
Removing the swingarm
OrderPart name Q’tyRemarks
Use a suitable stand to raise the front wheel
off the ground.
Brake hose holder Refer to “REAR BRAKE” on page 5-23.
Rear brake caliper Refer to “REAR BRAKE” on page 5-23.
Bolt (brake pedal)
Drive chain
1 Collars
2
2 Oil seals
2
3 Thrust bearing
2
4 Bushing
2
5 Oil seals
2
6 Bearing
4
For installation, reverse the removal proce-
dure.
1
2
3
6
4
6
4
1
3
6
2
5
T.R.70 Nm (7.0 mlbf)
kgf, 51 ft
T.R.4.0 Nm (0.40 mlbf)
kgf, 2.9 ft

SWINGARM
5-66
EAS2GC1217REMOVING THE SWINGARM
1. 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.
2. Measure:• Swingarm side play
• Swingarm vertical movement
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Measure the tightening torque of the pivot shaft nut.
b. Measure the swingarm side play “a” by mov- ing the swingarm from side to side.
c. If the swingarm side play is out of specifica- tion, check the spacers, the bearings, and
the collars.
d. Check the swingarm vertical movement “b” by moving the swingarm up and down.
If swingarm vertical movement is not smooth
or if there is binding, check the spacers, the
bearings, and the collars.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS2GC1218REMOVING THE BEARING
1. Remove:• Bearing “1”
TIP
Remove the bearing by pressing its outer race.
EAS2GC1219CHECKING THE SWINGARM
1. Check:• Swingarm
Bends/cracks/damage  Replace.
2. Check: • Pivot shaft
Roll the pivot shaft on a flat surface.
Bends  Replace.
EWA
WARNING
Do not attempt to straighten a bent pivot
shaft.
3. Wash with kerosene:
• Pivot shaft
• Spacers
•Collars
• Bearing
4. Check: • Oil seals
Damage  Replace.
• Bearing
• Spacers Free play exists/unsmooth revolution/rust 
Replace bearing and bushing as a set.
Pivot shaft nut
85 Nm (8.5 m·kgf, 61 ft·lbf)
Swingarm end free play limit (ra-
dial) 1.0 mm (0.04 in)
T R..

SWINGARM
5-67
EAS2GC1220INSTALLING THE SWINGARM
1. Lubricate:• Bearing
•Collars
• Spacers
• Oil seal
• Pivot shaft
2. Install: • Bearing “1”
• Oil seals “2” (to the swingarm)
TIP
First install the outer and then the inner bear-
ings to a specified depth from inside.
3. Install:
• Swingarm
TIP
Install the pivot shaft from the right.
4. Install:• Rear wheelRefer to “REAR WHEEL” on page 5-9.
5. Adjust:
• Drive chain slackRefer to “ADJUSTING THE DRIVE CHAIN
SLACK” on page 3-31. Recommended lubricant
Molybdenum disulfide grease
Installed depth “a” 0–0.5 mm (0–0.02 in)
Installed depth “b” 6.5 mm (0.26 in)
Pivot shaft nut 85 Nm (8.5 m·kgf, 61 ft·lbf)
Drive chain slack (on a suitable
stand) 50.0–60.0 mm (1.97–2.36 in)
New
New
2
22
1
1
aaa
b
ba
NewNewNew
T R..

CHAIN DRIVE
5-68
EAS2GC1221
CHAIN DRIVE
Removing the drive chain
Job OrderPart name Q’tyServicing Information
Drive sprocket Refer to “ENGINE REMOVAL” on page 6-1.
1 Drive chain 1
For installation, reverse the removal proce-
dure.
1
T.R.75 Nm (7.5 mlbf)
kgf, 54 ft
T.R.7 Nm (0.7 mlbf)
kgf, 5.1 ft

CHAIN DRIVE
5-69
EAS23420REMOVING THE DRIVE CHAIN
1. Stand the vehicle on a level surface.
EWA
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
TIP
Place the vehicle on a suitable stand so that the
rear wheel is elevated.
2. Remove:•Drive chain
TIP
Cut the drive chain with the drive chain cut &
rivet tool. (Use goods on the market)
EAS23441CHECKING THE DRIVE CHAIN
1. Measure:• 15-link section of the drive chain
Out of specification  Replace the drive
chain.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Measure the length “a” between the inner sides of the pins and the length “b” between
the outer sides of the pins on a 15-link sec-
tion of the drive chain as shown in the illus-
tration.
b. Calculate the length “c” of the 15-link section of the drive chain using the following formu-
la.
Drive chain 15-link section length “c” =
(length “a” between pin inner sides + length
“b” between pin outer sides)/2
TIP
• When measuring a 15-link section of the drive chain, make sure that the drive chain is taut.
• Perform this procedure 2–3 times, at a differ-
ent location each time.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
2. Check: •Drive chain
Stiffness  Clean, lubricate, or replace.
3. Clean: •Drive chain
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Wipe the drive chain with a clean cloth.
b. Put the drive chain in kerosene and remove any remaining dirt.
c. Remove the drive chain from the kerosene and completely dry it.
ECA
NOTICE
• This vehicle has a drive chain with small
rubber O-rings “1” between the drive
chain side plates. Never use high-pressure
water or air, steam, gasoline, certain sol-
vents (e.g., benzine), or a coarse brush to
clean the drive chain. High-pressure meth-
ods could force dirt or water into the drive
chain’s internals, and solvents will deteri-
orate the O-rings. A coarse brush can also
damage the O-rings. Therefore, use only
kerosene to clean the drive chain.
• Do not soak the drive chain in kerosene for more than ten minutes, otherwise the O-
rings can be damaged.
15-link length limit
239.3 mm (9.42 in)

CHAIN DRIVE
5-70
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
4. Check:• O-rings “1”Damage  Replace the drive chain.
• Drive chain rollers “2”
Damage/wear  Replace the drive chain.
• Drive chain side plates “3” Damage/wear  Replace the drive chain.
5. Lubricate: •Drive chain
EAS2GC1222CHECKING THE DRIVE SPROCKET
1. Check:• Drive sprocketMore than 1/4 tooth wear “a”  Replace the
drive sprocket and the rear wheel sprocket
as a set.
Bent tooth  Replace the drive sprocket
and the rear wheel sprocket as a set.
EAS2GC1223CHECKING THE REAR WHEEL SPROCKET
Refer to “CHECKING AND REPLACING THE
REAR WHEEL SPROCKET” on page 5-10.
EAS2GC1224INSTALLING THE DRIVE CHAIN
1. Install: •Drive chain
ECA
NOTICE
Be sure to put on safety goggles when
working.
TIP
Install the drive chain joint with the drive chain
cut & rivet tool. (Use goods on the market)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. When press fitting the connecting plate “1”,
make sure the space “a” between the end of
the connecting pin “2” and the connecting
plate is 1.2–1.4 mm (0.05–0.06 in).
b. After riveting, make sure the diameter be- tween the edges “b” of the connecting pin “2”
is 5.5–5.8 mm (0.22–0.23 in).
Recommended lubricant
Chain lubricant suitable for O-
ring chains
b. Correct
1. Drive chain roller
2. Drive sprocket

CHAIN DRIVE
5-71
c. After riveting, make sure the space “c”, which is inside of the connecting link “3” and
inside of the connecting plate “1”, is 14.1–
14.3 mm (0.56–0.65 in).
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
2. Lubricate:
•Drive chain
3. Install: • Drive sprocket
• Lock washer
• Drive sprocket nutRefer to “ENGINE REMOVAL” on page 6-1.
ECA
NOTICE
Never install a new drive chain onto worn
drive chain sprockets; this will dramatically
shorten the drive chain’s life.
4. Adjust:• Drive chain slackRefer to “ADJUSTING THE DRIVE CHAIN
SLACK” on page 3-31.
ECA
NOTICE
A drive chain that is too tight will overload
the engine and other vital parts, and one
that is too loose can skip and damage the
swingarm or cause an accident. Therefore,
keep the drive chain slack within the speci-
fied limits.
Recommended lubricant Chain lubricant suitable for O-
ring chains
Drive sprocket nut 75 Nm (7.5 m·kgf, 54 ft·lbf)
Drive chain slack (on a suitable
stand) 50.0–60.0 mm (1.97–2.36 in)
New
T R..

CHAIN DRIVE
5-72