YAMAHA YFZ450R 2018 Owner's Guide

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WARNING
EWB00221Always set the parking brake before starting
the engine. The ATV could start moving un-
expectedly if the parking brake is not ap-
plied. This could cause loss of control or a
collision.
 Always be sure you have released the park-
ing brake before you begin to ride. The brake
could overheat if you ride the ATV without re-
leasing the parking brake. You could lose braking performance which could cause an
accident. You could also wear out the brakes
prematurely.
EBU18532Shift pedalThe shift pedal is located on the left side of the en-
gine and is used in combination with the clutch
when shifting. (See page 6-2.)
1. Parking brake lever (unlocked position)
1. Shift pedal
1
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EBU18722Fuel tank capRemove the fuel tank cap by turning it counter-
clockwise.EBU37251FuelMake sure there is sufficient gasoline in the tank
before starting off. This model has been designed
to use premium unleaded gasoline of RON 97. If
knocking or pinging occurs, use a gasoline of a
higher octane (research octane number) or a dif-
ferent brand. Use of unleaded fuel will extend
spark plug life and reduce maintenance costs.
WARNING
EWB02522Gasoline and gasoline vapors are extremely
flammable. To avoid fires and explosions and
to reduce the risk of injury when refueling, fol-
low these instructions. 1. Before refueling, turn off the engine and besure that no one is sitting on the vehicle. Nev-
er refuel while smoking, or while in the vicinity
of sparks, open flames, or other sources of
ignition such as the pilot lights of water heat-
ers and clothes dryers.
2. When refueling, be sure to select the recom- mended fuel as specified. Do not overfill the
fuel tank. Since fuel expands when heated,
stop filling when the fuel reaches the bottom
of the filler tube. Otherwise heat from the en-
gine or sun can cause the fuel to expand and
spill out of the fuel tank.
1. Fuel tank cap
1
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TIPWhen refueling, check that the gasoline pump
nozzle has the same identification mark. NOTICEECB00071Use only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts, such as the valves and piston
rings, as well as to the exhaust system.
1. Maximum fuel level
2. Fuel tank filler tubeRecommended fuel:Premium unleaded gasoline, octane 97 or
higher
Fuel tank capacity: 10.0 L (2.64 US gal, 2.20 Imp.gal)
Fuel reserve amount: 3.4 L (0.90 US gal, 0.75 Imp.gal)
2
1
1. EN228 fuel identification mark
E10
1
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43. After refueling, return the nozzle and then
close the fuel tank cap fully by turning it
clockwise. Make sure the fuel tank cap is se-
curely closed.
4. Wipe up any spilled fuel immediately. NOTICE: Immediately wipe off spilled fuel
with a clean, dry, soft cloth, since fuel may
deteriorate painted surfaces or plastic
parts.
[ECB00982]
WARNING
EWB02532Gasoline is poisonous and can cause injury or
death. Handle gasoline with care. Never siphon
gasoline by mouth. If you should swallow some
gasoline or inhale a lot of gasoline vapor, or get
some gasoline in your eyes, see your doctor
immediately. If gasoline spills on your skin,
wash with soap and water. If gasoline spills on
your clothing, change your clothes.
EBU26733SeatTo remove the seat
Insert your hand between the rear of the seat and
the rear fender, pull the seat lock lever and pull up
the seat at the rear.1. Seat lock lever
1
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To install the seat
Insert the projections on the front of the seat into
the seat holders and push down on the seat at the
rear. Make sure that the seat is securely fitted.
EBU30052Front shock absorbersThese shock absorber assemblies are equipped
with a spring preload adjusting nut, a rebound
damping force adjusting screw, with a compres-
sion damping force adjusting bolt (for fast com- pression damping), and a compression damping
force adjusting screw (for slow compression
damping).
WARNING
EWB02492
Suspension components become hot during
operation. Never touch the compression
damping force adjusting bolt and screw, the
rebound damping force adjusting screw or
the oil reservoir with your bare hand or skin
until suspension components have cooled.
 Always adjust the shock absorber assem-
blies on the left and right side to the same
setting. Uneven adjustment can cause poor
handling and loss of stability, which could
lead to an accident. NOTICEECB00091Never turn an adjusting mechanism beyond
the minimum and maximum settings. TIPAlthough the total number of clicks or turns of a
damping force adjusting mechanism may not ex-
actly match the following specifications due to
1. Projection
2. Seat holder
1
2
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4small differences in production, the actual number
of clicks or turns always represents the entire ad-
justing range. To obtain a precise adjustment, it
would be advisable to check the number of clicks
or turns of each damping force adjusting mecha-
nism and to modify the specifications as neces-
sary.
Spring preload
1. Loosen the locknut.
2. Turn the spring preload adjusting nut in direc- tion (a) to increase the spring preload and
thereby harden the suspension, and in direc-
tion (b) to decrease the spring preload and
thereby soften the suspension.
TIPA special wrench can be obtained at a Yamaha
dealer to make this adjustment.
 The spring preload setting is determined by
measuring distance A, shown in the illustration.
The shorter distance A is, the higher the spring
preload; the longer distance A is, the lower the
spring preload. With each complete turn of the
adjusting nut, distance A is changed by 1.5 mm
(0.06 in). 1. Locknut
2. Spring preload adjusting nut
3. Special wrench
(a)
(b) 2 1
3
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3. Tighten the locknut to the specified torque. NOTICE: Always tighten the locknut
against the adjusting nut, and then tighten
it to the specified torque.
[ECB00082]
Rebound damping force
Turn the rebound damping force adjusting screw
in direction (a) to increase the rebound damping
force and thereby harden the damping, and in di-
rection (b) to decrease the rebound damping force
and thereby soften the damping.
Spring preload setting:
Minimum (soft):Distance A = 302.5 mm (11.91 in)
Standard: Distance A = 293.0 mm (11.54 in)
Maximum (hard): Distance A = 282.5 mm (11.12 in)
1. Distance A
1
Tightening torque: Locknut:50 N·m (5.0 kgf·m, 37 lb·ft)1. Rebound damping force adjusting screw
(a)
(b)
1
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4Compression damping force
Fast compression damping force
To increase the fast compression damping force
and thereby harden the compression damping,
turn the fast compression damping force adjust-
ing bolt in direction (a). To decrease the fast com-
pression damping force and thereby soften the
compression damping, turn the adjusting bolt in
direction (b).Rebound damping setting:
Minimum (soft):30 click(s) in direction (b)*
Standard: 16 click(s) in direction (b)*
Maximum (hard): 1 click(s) in direction (b)*
* With the adjusting screw fully turned in di- rection (a)
1. Fast compression damping force adjusting boltFast compression damping setting: Minimum (soft):2 turn(s) out from the fully turned in posi-
tion
Standard: 1 turn(s) out from the fully turned in posi-
tion
Maximum (hard): Adjusting bolt fully turned in
(a)
(b)1
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Slow compression damping force
To increase the slow compression damping force
and thereby harden the compression damping,
turn the slow compression damping force adjust-
ing screw in direction (a). To decrease the slow
compression damping force and thereby soften
the compression damping, turn the adjusting
screw in direction (b).
WARNING
EWB00411These shock absorber assemblies contain
highly pressurized nitrogen gas. Read and un-
derstand the following information before han-
dling the shock absorber assemblies.

Do not tamper with or attempt to open the
cylinder assemblies.
 Do not subject the shock absorber assem-
blies to an open flame or other high heat
source. This may cause the unit to explode
due to excessive gas pressure.
 Do not deform or damage the cylinders in
any way. Cylinder damage will result in poor
damping performance.
1. Slow compression damping force adjusting screw
(a)
(b)
1
Slow compression damping setting:
Minimum (soft):20 click(s) in direction (b)*
Standard: 7 click(s) in direction (b)*
Maximum (hard): 1 click(s) in direction (b)*
* With the adjusting screw fully turned in di- rection (a)
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4
Do not dispose of a damaged or worn out
shock absorber assembly yourself. Take the
shock absorber assembly to a Yamaha deal-
er for any service.
EBU30143Rear shock absorbersThis shock absorber assembly is equipped with a
spring preload adjusting nut, a rebound damping
force adjusting screw, a compression damping
force adjusting bolt (for fast compression damp-
ing), and a compression damping force adjusting
screw (for slow compression damping).
WARNING
EWB02681Suspension components become hot during
operation. Never touch the compression
damping force adjusting bolt and screw, the
rebound damping force adjusting screw or the
oil reservoir with your bare hand or skin until
the suspension components have cooled. NOTICEECB00091Never turn an adjusting mechanism beyond
the minimum and maximum settings.
TIPAlthough the total number of clicks or turns of a
damping force adjusting mechanism may not ex-
actly match the following specifications due to
small differences in production, the actual number
of clicks or turns always represents the entire ad-
justing range. To obtain a precise adjustment, it
would be advisable to check the number of clicks
or turns of each damping force adjusting mecha-
nism and to modify the specifications as neces-
sary. Spring preload
1. Remove the cowling. (See page 8-10.)
2. Remove the clip from the hose holder, re- move the bolt, and then move the blow-by
gas chamber away from the vehicle.
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