2015 YAMAHA WR 450F engine

OPERATION AND IMPORTANT RIDING POINTS
5-2
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10
11
12 initially when the main switch is
pushed to “ON”, or if a warning light
remains on, see page 3-1 for the cor-
responding warning light circuit
check.
2. Shift the transmission into the neu- tral position. The neutral indicator
light should come on. If not, ask a
Yamaha dealer to check the elec-
trical circuit.
3. Turn the starter on and completely close the throttle. (See page 3-12.)
4. Start the engine by pushing the start switch or by pushing the kick-
starter lever down.
If the engine fails to start when us-
ing the start switch, release it, wait
a few seconds, and then try again.
Each starting attempt should be as
short as possible to preserve the
battery. Do not crank the engine
more than 10 seconds on any one
attempt. If the engine does not
start with the starter motor, try us-
ing the kickstarter.NOTICE
ECA17802
If the starter motor will not turn when the start switch is pushed, stop
pushing it immediately in order to
avoid placing extra load on the start-
er motor, and start the engine by us-
ing the kickstarter.TIPUse the kickstarter when the ambient
temperature is below 10
C (50 F) orwhen at high altitude.
5. When the engine is warm, turn the starter off.TIPThe engine is warm when it responds
quickly to the throttle with the starterturned off.
Starting with the kickstarter
When using the kickstarter to start the
engine, follow the procedures as de-
scribed below.1. Fold out the kickstarter lever, push it down lightly with your foot until
resistance is felt. 2. With the throttle fully closed, push
the kickstarter down lightly until the
gears engage, and then push it
down smoothly but forcefully.
WARNING
EWA16382
Do not open the throttle while kick-
ing the kickstarter lever. Otherwise,the kickstarter lever may kick back.
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OPERATION AND IMPORTANT RIDING POINTS
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TIPIf the engine fails to start, push the main
switch to “OFF” and give the kickstarter
10 to 20 slow kicks at full throttle in or-
der to clear the engine of the rich air-fu-el mixture retained in it.
EAU52972
Starting a warm engineFollow the same procedure as for start-
ing a cold engine with the exception
that the starter is not required when the
engine is warm.TIP
If the engine does not start at high
altitude, start the engine with the
throttle grip opened by one degree
or two degrees.

The mark on the throttle housing
indicates five degrees. Use the
mark for your reference whenopening the throttle grip.
EAU16672
ShiftingShifting gears lets you control the
amount of engine power available for
starting off, accelerating, climbing hills,
etc.
The gear positions are shown in the il-
lustration.TIPTo shift the transmission into the neu-
tral position, press the shift pedal down
repeatedly until it reaches the end of itstravel, and then slightly raise it.
1. Mark
1
1. Shift pedal
2. Neutral position
2 3
4 5N1 1
2
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OPERATION AND IMPORTANT RIDING POINTS
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NOTICE
ECA10261

Even with the transmission in
the neutral position, do not
coast for long periods of time
with the engine off, and do not
tow the motorcycle for long dis-
tances. The transmission is
properly lubricated only when
the engine is running. Inade-
quate lubrication may damage
the transmission.

Always use the clutch while
changing gears to avoid damag-
ing the engine, transmission,
and drive train, which are not
designed to withstand theshock of forced shifting.
EAU16811
Tips for reducing fuel
consumptionFuel consumption depends largely on
your riding style. Consider the following
tips to reduce fuel consumption:
Shift up swiftly, and avoid high en-
gine speeds during acceleration.

Do not rev the engine while shifting
down, and avoid high engine
speeds with no load on the engine.

Turn the engine off instead of let-
ting it idle for an extended length of
time (e.g., in traffic jams, at traffic
lights or at railroad crossings).
EAU52941
Engine break-in
WARNING
EWA10322
Failure to properly maintain the ve-
hicle or performing maintenance ac-
tivities incorrectly may increase
your risk of injury or death during
service or while using the vehicle. If
you are not familiar with vehicle ser-
vice, have a Yamaha dealer performservice. 1. Before starting the engine, fill the fuel tank with the fuel.
2. Start and warm up the engine. Check the operation of the controls
and the engine stop switch. (See
page 3-7.) Then, restart the engine
and check its operation within no
more than 5 minutes after it is re-
started.
3. Operate the motorcycle in the low- er gears at moderate throttle open-
ings for five to eight minutes. Stop
the engine.
4. Check how the engine runs when the motorcycle is ridden with the
throttle 1/4 to 1/2 open (low to me-
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OPERATION AND IMPORTANT RIDING POINTS
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dium speed) for about one hour.
5. Start the engine and check the op- eration of the motorcycle through-
out its entire operating range.
Restart the motorcycle and ride it
for about 10 to 15 more minutes.
The motorcycle will now be ready
to ride normally.
After the engine break-in period, thor-
oughly check the motorcycle for loose
parts, oil leakage and any other prob-
lems. Be sure to inspect and make ad-
justments thoroughly, especially cable
and drive chain slack and loose
spokes. In addition, check all fittings
and fasteners for looseness, and tight-
en if necessary.
NOTICE
ECA15561

When any of the following parts
have been replaced, they must
be broken in.
Cylinder or crankshaft:
About one hour of break-in op-
eration is necessary.
Piston, rings or transmission
gears:
These parts require about 30
minutes of break-in operation at half-throttle or less. Observe the
condition of the engine carefully
during operation.

If any engine trouble should oc-
cur during the engine break-in
period, immediately have a
Yamaha dealer check the vehi-cle.
EAU52412
ParkingWhen parking, stop the engine by
pushing the main switch to “OFF”.
To help prevent theft, use the steering
lock when leaving the vehicle unattend-
ed. (See page 3-13 for more informa-
tion.)
WARNING
EWA10312

Since the engine and exhaust
system can become very hot,
park in a place where pedestri-
ans or children are not likely to
touch them and be burned.

Do not park on a slope or on soft
ground, otherwise the vehicle
may overturn, increasing the
risk of a fuel leak and fire.

Do not park near grass or other
flammable materials whichmight catch fire.
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PERIODIC MAINTENANCE AND ADJUSTMENT
EAU17245
Periodic inspection, adjustment, and lu-
brication will keep your vehicle in the
safest and most efficient condition pos-
sible. Safety is an obligation of the vehi-
cle owner/operator. The most important
points of vehicle inspection, adjust-
ment, and lubrication are explained on
the following pages.
The intervals given in the periodic
maintenance charts should be simply
considered as a general guide under
normal riding conditions. However, de-
pending on the weather, terrain, geo-
graphical location, and individual use,
the maintenance intervals may need to
be shortened.
WARNING
EWA10322
Failure to properly maintain the ve-
hicle or performing maintenance ac-
tivities incorrectly may increase
your risk of injury or death during
service or while using the vehicle. If
you are not familiar with vehicle ser-
vice, have a Yamaha dealer performservice.
WARNING
EWA15123
Turn off the engine when performing
maintenance unless otherwise
specified.
A running engine has moving
parts that can catch on body
parts or clothing and electrical
parts that can cause shocks or
fires.

Running the engine while ser-
vicing can lead to eye injury,
burns, fire, or carbon monoxide
poisoning – possibly leading to
death. See page 1-2 for more in-
formation about carbon monox-ide.WARNING
EWA15461
Brake discs, calipers, drums, and
linings can become very hot during
use. To avoid possible burns, let
brake components cool beforetouching them.
EAU17303
Emission controls not only function to
ensure cleaner air, but are also vital to
proper engine operation and maximum
performance. In the following periodic
maintenance charts, the services relat-
ed to emissions control are grouped
separately. These services require
specialized data, knowledge, and
equipment. Maintenance, replacement,
or repair of the emission control devic-
es and systems may be performed by
any repair establishment or individual
that is certified (if applicable). Yamaha
dealers are trained and equipped to
perform these particular services.
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PERIODIC MAINTENANCE AND ADJUSTMENT
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EAU52501
TIP
The annual checks must be performed every year, except if a kilometer-based maintenance, or for the UK, a
mileage-based maintenance, is performed instead.

From 7000 km (4200 mi) or 9 months, repeat the maintenance intervals starting from 3000 km (1800 mi) or 3 months.

Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technicalskills.
EAU52511
Periodic maintenance chart for the emission control systemNO. ITEM CHECKS AND MAINTENANCE JOBS INITIAL
ODOMETER
READINGS ANNUAL
CHECK
1000 km
(600 mi) or 1 month 3000 km
(1800 mi) or 3 months 5000 km
(3000 mi) or 6 months
1 *Fuel line Check fuel hoses for cracks or damage. 
2 *Spark plug Check condition.
Clean and regap.
Replace if necessary. 
3 *Valves Check valve clearance.
Adjust. 
4 *Breather system Check ventilation hose for cracks or damage and drain any
deposits. 
5 *Fuel injection Adjust engine idling speed. 
6 Muffler and exhaust
pipe Check the screw cl
amp(s) for looseness. 
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PERIODIC MAINTENANCE AND ADJUSTMENT
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13 *Chassis fasteners Make sure that all nuts, bol
ts and screws are properly
tightened. 
14 Brake lever pivot
shaft Lubricate with silicone grease.

15 Brake pedal pivot
shaft Lubricate with lithium-soap-based grease.

16 Clutch lever pivot
shaft Lubricate with lithium-soap-based grease.

17 Sidestand Check operation.
Lubricate with lithium-soap-based grease. 
18 *Sidestand switch Check operation. 
19 *Front fork Check operation and for oil leakage. 
20 *Shock absorber
assembly Check operation and shock absorber for oil leakage.

21 *Rear suspension
relay arm and
connecting arm
pivoting points Check operation.

22 Engine oil Change.
Check oil level and vehicle for oil leakage. 
23 Engine oil filter
element

24 *Cooling system Check hoses for cracks of damage.
Replace if necessary.

Check coolant level and vehicle for coolant leakage. 
Change with ethylene glycol anti-freeze coolant. Every 1 year
25 *Front and rear brake
switches Check operation.

NO. ITEM CHECKS AND MAINTENANCE JOBS
INITIAL
ODOMETER
READINGS ANNUAL
CHECK
1000 km
(600 mi) or 1 month 3000 km
(1800 mi) or 3 months 5000 km
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PERIODIC MAINTENANCE AND ADJUSTMENT
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EAU18752
Removing and installing the
panelThe panel shown needs to be removed
to perform some of the maintenance
jobs described in this chapter. Refer to
this section each time the panel needs
to be removed and installed.
EAU52873
Panel A
To remove the panel1. Remove the seat. (See page 3-13.)
2. Remove the bolts. 3. Pull the front part of the panel out-
ward, and then remove the panel
by pulling it off.
To install the panel
1. Place the panel in the original posi- tion, and then install the bolts.
2. Install the seat.
EAU19623
Checking the spark plugThe spark plug is an important engine
component, which should be checked
periodically, preferably by a Yamaha
dealer. Since heat and deposits will
cause any spark plug to slowly erode, it
should be removed and checked in ac-
cordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can re-
veal the condition of the engine.
The porcelain insulator around the cen-
ter electrode of the spark plug should
be a medium-to-light tan (the ideal color
when the vehicle is ridden normally). If
the spark plug shows a distinctly differ-
ent color, the engine could be operating
improperly. Do not attempt to diagnose
such problems yourself. Instead, have
a Yamaha dealer check the vehicle.
If the spark plug shows signs of elec-
trode erosion and excessive carbon or
other deposits, it should be replaced.
Before installing a spark plug, the spark
plug gap should be measured with a
1. Panel A
1
1. Bolt
1 1
Specified spark plug:NGK/CR8E
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