2008 YAMAHA WR 450F reset

1-9
MULTI-FUNCTION DISPLAY
COLD STARTER KNOB
When cold, the engine requires a
richer air-fuel mixture for starting. A
separate starter circuit, which is con-
trolled by the cold starter knob "1",
supplies this mixture. Pull the cold
starter knob out to open the circuit for
starting. When the engine has
warmed up, push it in to close the cir-
cuit.
HOT STARTER LEVER
The hot starter lever "1" is used when
starting a warm engine. Use the hot
starter lever when starting the engine
again immediately after it was
stopped (the engine is still warm).
Pulling the hot starter lever injects
secondary air to thin the air-fuel mix-
ture temporarily, allowing the engine
to be started more easily.
SIDESTAND
This sidestand "1" is used to support
only the machine when standing or
transporting it.
• Never apply additional force to
the sidestand.
• Hold up the sidestand before
starting out.
MULTI-FUNCTION DISPLAY
Be sure to stop the machine before
making any setting changes to the
multi-function display.
The multi-function display is
equipped with the following:
BASIC MODE:
• Speedometer
•Clock
• Two tripmeters (which shows the
distance that has been traveled
since it was last set to zero)
RACE MODE:
• Timer (which shows the time that
has been accumulated since the
start of timer measurement)
• Tripmeter (which shows the accu-
mulated travel distance in timer
measurement)
• Change tripmeter digits (capable of
change to any given ones)
DESCRIPTION
Operation buttons:
1. Select button "SLCT 1"
2. Select button "SLCT 2"
3. Reset button "RST"
Screen display:
4. Tripmeter indicator
5. Tripmeter indicator
6. Timer indicator
7. Clock/Timer
8. Speedometer
9. Odometer/Tripmeter
The operation buttons can be pushed
in the following two manners:
Short push: Push the button. ( )
Long push: Push the button for 2 sec-
onds or more. ( )
BASIC MODE
Changing speedometer display
(for U.K.)
1. Push the "SLCT2" button for 2
seconds or more to change the
speedometer units. The speed-
ometer display will change in the
following order:
MPH→km/h→MPH.Setting the time
1. Push the "SLCT1" button for 2
seconds or more to enter the time
setting mode.
2. Push the "RST" button to change
the display for time indication.
The display will change in the fol-
lowing order:
Hour→Minute→Second→Hour.
The digits capable of setting go on
flashing.
3. Push the "SLCT1" button (plus) or
"SLCT2" button (minus) and
change the time. A long push on
the button will fast-forward the
time.
4. To end the setting, push the
"RST" button for 2 seconds or
more.
• In a 30-second absence of button
operation, the setting will come to
an end with the indicated time.
• To reset the seconds, push the
"SLCT1" button or "SLCT2" button.
Changing odometer and tripmeter
A/B (TRIP A/B)
1. Push the "SLCT2" button to
change the tripmeter display. The
display will change in the follow-
ing order:
Odometer →TRIP A→TRIP B→
TRIP A→Odometer.

1-10
MULTI-FUNCTION DISPLAY
To reset the digits, select the tripme-
ter involved and push the "RST" but-
ton for 2 seconds or more.
CHANGEOVER TO BASIC MODE/
RACE MODE
• Measurement using the timer func-
tion can be made in RACE MODE.
• Indicator will light up as an
identifier that shows RACE MODE
has been selected.
• RACE MODE cannot display the
functions as in BASIC MODE.
• Changeover to RACE MODE forc-
es the digits for tripmeter A (TRIP
A) in BASIC MODE to be reset.
Changeover from BASIC MODE to
RACE MODE
1. Push the "SLCT1" button and
"SLCT2" button for 2 seconds or
more at the same time to change
over to RACE MODE.
Changeover to RACE MODE will put
manual start measurement on stand-
by causing and to flash. (For
manual start, refer to "Putting mea-
surement on standby" in "RACE
MODE".)
Returning to BASIC MODE from
RACE MODE
It is possible to return to BASIC
MODE with timer measurement at a
stop.
1. Check that the timer is not in op-
eration. If the timer is in operation,
stop the timer by pushing the
"SLCT1" button and "SLCT2" but-
ton at the same time.
2. Push the "SLCT1" button and
"SLCT2" button for 2 seconds or
more at the same time to change
over to BASIC MODE.
RACE MODE
Putting measurement on standby
Starting measurement consists of the
following two starts, either of which
can be selected.
• Manual start
Starting measurement by the rider
himself operating the button. (A long
push on the "SLCT2" button will put
measurement on standby.)
• Auto start
Starting timer measurement automat-
ically on detection of the movement of
the machine. (A long push on the
"SLCT1" button will put measurement
on standby.)
Manual start
Initial setting at changeover to RACE
MODE will remain for manual start.
1. Check that changeover to RACE
MODE has been made. (Refer to
"Changeover from BASIC MODE
to RACE MODE".)
When the machine is made ready for
a run by manual start, and will
start flashing.
2. Start timer measurement by
pushing the "RST" button.
3. When stopping timer measure-
ment, pushing the "SLCT1" but-
ton and "SLCT2" button at the
same time.
If the machine is run while timer mea-
surement is not made, no change will
occur to the digit in tripmeter A (TRIP
A).
4. To resume the measurement,
again push the "SLCT1" button
and "SLCT2" button at the same
time.
Auto start
1. Check that changeover has been
made to RACE MODE. (Refer to
"Changeover from BASIC MODE
to RACE MODE".)
2. Make the machine ready for a run
by pushing the "SLCT1" button for
2 seconds or more.
When the measurement is made
ready for a run by auto start, and
will start flashing. Timer display
will turn on scrolling from left to right.
3. Run the machine and start timer
measurement.
4. To stop timer measurement,
pushing the "SLCT1" button and
"SLCT2" button at the same time.

1-11
MULTI-FUNCTION DISPLAY
If the machine is run while timer mea-
surement is not made, no change will
occur to the digit in tripmeter A (TRIP
A).
5. To resume the measurement,
again pushing the "SLCT1" button
and "SLCT2" button at the same
time.
Resetting measurement data
Resetting can be made in the follow-
ing two manners.
Resetting is possible while timer
measurement is made:
• Reset tripmeter A.
Resetting is possible while timer
measurement is not made:
• Reset tripmeter A and timer.
Resetting tripmeter A (TRIP A)
1. Check that the timer is in opera-
tion. If the timer is not in opera-
tion, start the timer by pushing the
"SLCT1" button and "SLCT2" but-
ton at the same time.
2. Reset tripmeter A (TRIP A) dis-
play by pushing the "RST" button
for 2 seconds or more.
If reset, and travel distance dis-
play will go on flashing for four sec-
onds.
Resetting tripmeter A (TRIP A) and
timer
1. Check that the timer is not in op-
eration. If the timer is in operation,
stop it by pushing the "SLCT1"
button and "SLCT2" button at the
same time.
2. Reset all measured data by push-
ing the "RST" button for 2 sec-
onds or more.
• Resetting will reset the timer display
and travel distance display and put
measurement on standby.
• Auto start attempt will put measure-
ment on standby as such. Likewise,
manual start attempt will put mea-
surement on standby as such.
Correcting tripmeter A (TRIP A)
1. Change the travel distance dis-
play by pushing the "SLCT1" but-
ton (plus) or "SLCT2" button
(minus). A long push on the but-
ton will fast-forward the change.
Change can be made any time while
timer measurement is or is not being
made.

1-12
MULTI-FUNCTION DISPLAY
FUNCTION DIAGRAM
A short push on the button changes
the operation in the arrowed direction.
A short push on the button changes
the operation in both arrowed directions.
A long push on the button changes the
operation in the arrowed direction.
A long push on the button changes the
operation in both arrowed directions.Meter function
Function that can be performed whether
the time is or is not in operation.
Extent to which the meter can operate
Clock
BASIC MODE
Tripmeter
ODO TRIP A TRIP B ODO
Speedometer
(for U.K.)
MPH
km/h MPH
Putting measurement on
standby
Manual startAuto start
RACE MODE
Timer in operation
Reset
TRIP ACorrect
TRIP AMeasurement starts as the
machine moves
Timer not in
operation
Correct
TRIP AReset
TRIP A &
timer

1-13
MULTI-FUNCTION DISPLAY
The following diagram illustrates the
multi-function display regarding the
direction and operation condition in-
volved in each of its functions.
A. A short push on the button
changes the operation in the ar-
rowed direction.
B. A short push on the button
changes the operation in both
arrowed directions.
C. A long push on the button
changes the operation in the ar-
rowed direction.
D. A long push on the button
changes the operation in both
arrowed directions.
E. Meter function
F. Function that can be performed
whether the time is or is not in
operation.
G. Extent to which the meter can
operate
1.BASIC MODE
2. Clock
3. Trip meter
4. Speedometer (for U.K.)
5.RACE MODE
6. Putting measurement on stand-
by
7. Manual start
8. Auto start
9. Measurement starts as the ma-
chine moves
10. Timer in operation
11. Reset TRIP A
12. Correct TRIP A
13. Timer not in operation
14. Reset TRIP A & timer

4-1
ENGINE
TUNING
ENGINE
CARBURETOR SETTING
• The air/fuel mixture will vary de-
pending on atmospheric conditions.
Therefore, it is necessary to take
into consideration the air pressure,
ambient temperature, humidity,
etc., when adjusting the carburetor.
• Perform a test run to check for prop-
er engine performance (e.g., throt-
tle response) and spark plug(-s)
discoloration or fouling. Use these
readings to determine the best pos-
sible carburetor setting.
It is recommended to keep a record of
all carburetor settings and external
conditions (e.g., atmospheric condi-
tions, track/surface conditions, lap
times) to make future carburetor set-
ting easier.
• The carburetor is a part of the
fuel line. Therefore, be sure to in-
stall it in a wellventilated area,
away from flammable objects
and any sources of fire.
• Never look into the carburetor in-
take. Flames may shoot out from
the pipe if the engine backfires
while it is being started. Gasoline
may be discharged from the ac-
celerator pump nozzle when the
carburetor has been removed.
• The carburetor is extremely sen-
sitive to foreign matter (dirt,
sand, water, etc.). During instal-
lation, do not allow foreign mat-
ter to get into the carburetor.
• Always handle the carburetor
and its components carefully.
Even slight scratches, bends or
damage to carburetor parts may
prevent the carburetor from
functioning correctly. Carefully
perform all servicing with the ap-
propriate tools and without ap-
plying excessive force.
• When the engine is stopped or
when riding at no load, do not
open and close the throttle un-
necessarily. Otherwise, too
much fuel may be discharged,
starting may become difficult or
the engine may not run well.• After installing the carburetor,
check that the throttle operates
correctly and opens and closes
smoothly.
ATMOSPHERIC CONDITIONS AND
CARBURETOR SETTINGS
The air density (i.e., concentration of
oxygen in the air) determines the rich-
ness or leanness of the air/fuel mix-
ture.
• Higher temperature expands the air
with its resultant reduced density.
• Higher humidity reduces the
amount of oxygen in the air by so
much of the water vapor in the
same air.
• Lower atmospheric pressure (at a
high altitude) reduces the density of
the air.
EFFECT OF SETTING PARTS IN
RELATION TO THROTTLE VALVE
OPENING
A. Closed
B. Fully open
1. Pilot jet
2. Throttle valve cutaway
3. Jet needle
4. Main jetCONSTRUCTION OF
CARBURETOR AND SETTING
PARTS
The FLATCR carburetor has a prima-
ry main jet. This type of main jet is
perfect for racing machines since it
supplies an even flow of fuel, even at
full load. Use the main jet and the jet
needle to set the carburetor.
1. Jet needle
2. Pilot air jet
3. Needle jet
4. Main jet
5. Pilot jet
ADJUSTING THE MAIN JET
The richness of the air-fuel mixture at
full throttle can be set by changing the
main jet "1".
If the air-fuel mixture is too rich or too
lean, the engine power will drop, re-
sulting in poor acceleration.
Effects of changing the main jet
(reference)
A. Idle
B. Fully open
1. #165
2. #160
3. #162 Air
tem
p.Hu-
midi-
tyAir
pres-
sure
(alti-
tude)Mix-
tureSet-
ting
High HighLow
(high)Rich-
erLean-
er
Low LowHigh
(low)Lean-
erRich-
er
Standard main jet#162
* #160
* For EUROPE

4-8
CHASSIS
SUSPENSION SETTING (FRONT FORK)
• If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to
the adjustment procedure given in the same chart.
• Before any change, set the rear shock absorber sunken length to the standard figure 90–100 mm (3.5–3.9 in).
SymptomSection
Check Adjust
JumpLarge
gapMedi-
um
gapSmall
gap
Stiff over entire
range○○○Compression damping Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Oil level (oil amount) Decrease oil level by about 5–10 mm (0.2–0.4 in).
Spring Replace with soft spring.
Unsmooth move-
ment over entire
range○○○○Outer tube Check for any bends, dents, and other noticeable
scars, etc. If any, replace affected parts.
Inner tube
Under bracket tighten-
ing torqueRetighten to specified torque.
Poor initial move-
ment○Rebound damping Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Oil seal Apply grease in oil seal wall.
Soft over entire
range, bottoming
out○○Compression damping Turn adjuster clockwise (about 2 clicks) to in-
crease damping.
Oil level (oil amount) Increase oil level by about 5–10 mm (0.2–0.4 in).
Spring Replace with stiff spring.
Stiff toward stroke
end○Oil level (oil amount) Decrease oil level by about 5 mm (0.2 in).
Soft toward stroke
end, bottoming out○Oil level (oil amount) Increase oil level by about 5 mm (0.2 in).
Stiff initial move-
ment○○○○Compression dampingTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Low front, tending to
lower front posture○○Compression damping Turn adjuster clockwise (about 2 clicks) to in-
crease damping.
Rebound damping Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Balance with rear end Set sunken length for 95–100 mm (3.7–3.9 in)
when one passenger is astride seat (lower rear
posture).
Oil level (oil amount) Increase oil level by about 5 mm (0.2 in).
"Obtrusive" front,
tending to upper
front posture○○Compression damping Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Balance with rear end Set sunken length for 90–95 mm (3.5–3.7 in)
when one passenger is astride seat (upper rear
posture).
Spring Replace with soft spring.
Oil level (oil amount) Decrease oil level by about 5–10 mm (0.2–0.4 in).

4-9
CHASSIS
SUSPENSION SETTING (REAR SHOCK ABSORBER)
• If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to
the adjustment procedure given in the same chart.
• Adjust the rebound damping in 2-click increments or decrements.
• Adjust the low compression damping in 1-click increments or decrements.
• Adjust the high compression damping in 1/6 turn increments or decrements.
SymptomSection
Check Adjust
JumpLarge
gapMedi-
um
gapSmall
gap
Stiff, tending to sink○○Rebound damping Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Spring set length Set sunken length for 90–100 mm (3.5–3.9 in)
when one passenger is astride seat.
Spongy and unsta-
ble○○Rebound damping Turn adjuster clockwise (about 2 clicks) to in-
crease damping.
Low compression
dampingTurn adjuster clockwise (about 1 click) to increase
damping.
Spring Replace with stiff spring.
Heavy and dragging○○Rebound damping Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Spring Replace with soft spring.
Poor road gripping○Rebound damping Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Low compression
dampingTurn adjuster clockwise (about 1 clicks) to in-
crease damping.
High compression
dampingTurn adjuster clockwise (about 1/6 turn) to in-
crease damping.
Spring set length Set sunken length for 90–100 mm (3.5–3.9 in)
when one passenger is astride seat.
Spring Replace with soft spring.
Bottoming out○○High compression
dampingTurn adjuster clockwise (about 1/6 turn) to in-
crease damping.
Spring set length Set sunken length for 90–100 mm (3.5–3.9 in)
when one passenger in astride seat.
Spring Replace with stiff spring.
Bouncing○○Rebound damping Turn adjuster clockwise (about 2 clicks) to in-
crease damping.
Spring Replace with soft spring.
Stiff travel○○High compression
dampingTurn adjuster counterclockwise (about 1/6 turn) to
decrease damping.
Spring set length Set sunken length for 90–100 mm (3.5–3.9 in)
when one passenger is astride seat.
Spring Replace with soft spring.