2017 YAMAHA WR 250F tire pressure

MOTORCYCLE CARE AND STORAGE
1-38
e. Remove the spark plug cap from the spark
plug, and then install the spark plug and the
spark plug cap. WARNING! To prevent
damage or injury from sparking, make
sure to ground the spark plug electrodes
while turning the engine over.
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4. Lubricate all control cables and the pivoting
points of all levers and pedals as well as of
the sidestand/ centerstand.
5. Check and, if necessary, correct the tire air
pressure, and then lift the motorcycle so that
both of its wheels are off the ground. Alter-
natively, turn the wheels a little every month
in order to prevent the tires from becoming
degraded in one spot.
6. Cover the muffler outlet with a plastic bag to
prevent moisture from entering it.
7. Remove the battery and fully charge it. Store
it in a cool, dry place and charge it once a
month. Do not store the battery in an exces-
sively cold or warm place [less than 0 °C (30
°F) or more than 30 °C (90 °F)]. For more in-
formation on storing the battery, See page
9-69.
TIP
Make any necessary repairs before storing the
motorcycle.

CHASSIS SPECIFICATIONS
2-7
EAS2GBB063
CHASSIS SPECIFICATIONS
Chassis
Frame type Semi double cradle
Caster angle 26.3 °
Trail 114 mm (4.5 in)
Front wheel
Wheel type Spoke wheel
Rim size 1.60 21
Rim material Aluminum
Wheel travel 310 mm (12.2 in)
Radial wheel runout limit 2.0 mm (0.08 in)
Lateral wheel runout limit 2.0 mm (0.08 in)
Wheel axle bending limit 0.50 mm (0.02 in)
Rear wheel
Wheel type Spoke wheel
Rim size 2.15  18
Rim material Aluminum
Wheel travel 318 mm (12.5 in)
Radial wheel runout limit 2.0 mm (0.08 in)
Lateral wheel runout limit 2.0 mm (0.08 in)
Wheel axle bending limit 0.50 mm (0.02 in)
Front tire
Type With tube
Size 80/100-21 51M (USA) (CAN)
90/90-21 M/C 54M M+S (EUR) (AUS) (NZL)
(ZAF)
Manufacturer/model DUNLOP/MX51FA (USA) (CAN)
PIRELLI/SIX DAYS EXTREME (EUR) (AUS)
(NZL) (ZAF)
Rear tire
Type With tube
Size 110/100-18 64M (USA) (CAN)
130/90-18 M/C 69M M+S (EUR) (AUS) (NZL)
(ZAF)
Manufacturer/model DUNLOP/MX51 (USA) (CAN)
PIRELLI/SIX DAYS EXTREME (EUR) (AUS)
(NZL) (ZAF)
Tire air pressure (measured on cold tires)
Front 100 kPa (1.00 kgf/cm2, 15 psi)
Rear 100 kPa (1.00 kgf/cm2, 15 psi)
Front brake
Type Hydraulic single disc brake
Operation Right hand operation
Front disc brake
Disc outside diameter  thickness 270.0  3.0 mm (10.63  0.12 in)
Brake disc thickness limit 2.5 mm (0.10 in)
Brake pad lining thickness 4.4 mm (0.17 in)
Limit 1.0 mm (0.04 in)
Master cylinder inside diameter 9.52 mm (0.37 in)
Caliper cylinder inside diameter 22.65 mm, 22.65 mm (0.89 in, 0.89 in)
Specified brake fluid DOT 4

PERIODIC MAINTENANCE
3-2
EAS2GBB077GENERAL MAINTENANCE AND LUBRICATION CHART
NO. ITEM CHECKS AND MAINTENANCE JOBSINITIALODOMETER READ-
INGS
600 mi
(1000
km) or 1
month1800 mi
(3000
km) or 3
months3000 mi
(5000
km) or 6
months
1Clutch• Check operation.
• Adjust or replace cable.
2*Cooling sys-
tem• Check hoses for cracks of damage.
• Replace if necessary.
• Replace with ethylene glycol anti-
freeze coolant every 1 year.Every 1 year
3*Spark arrest-
er• Clean.
4*Front brake• Check operation, fluid level, and for flu-
id leakage.
• Replace brake pads if necessary.
• Replace brake fluid every 1 year. Every 1 year
5*Rear brake• Check operation, fluid level, and for flu-
id leakage.
• Replace brake pads if necessary.
• Replace brake fluid every 1 year. Every 1 year
6*Brake hoses• Check for cracks or damage.
• Replace. Every 4 years
7*Wheels• Check runout, spoke tightness and for
damage.
• Tighten spokes if necessary.
8*Tires• Check tread depth and for damage.
• Replace if necessary.
• Check air pressure.
• Correct if necessary.
9*Wheel bear-
ings• Check bearings for smooth operation.
• Replace if necessary.
10*Swingarm
pivot bear-
ings• Check bearing assemblies for loose-
ness.
• Moderately repack with lithium-soap-
based grease.
11Drive chain• Check chain slack/alignment and con-
dition.
• Adjust and lubricate chain with a spe-
cial O-ring chain lubricant thoroughly.Every ride
12*Steering
bearings• Check bearing assemblies for loose-
ness.
• Moderately repack with lithium-soap-
based grease every 1200 mi (2000
km) or 12 months (whichever comes
first).

PRE-OPERATION INSPECTION AND MAINTENANCE
3-9
EAS2GBB079
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating
condition.
Before using this machine, check the following points.
EAS2GBB080GENERAL INSPECTION AND MAINTENANCE
TIP
Perform usual maintenance enough so that, in the race course, a confirmation of that and simple set-
ting adjustments may only be left, in order to get enough time to use effectively.ITEM inspect Page
CoolantCheck that coolant is filled up to the radiator cap.
Check the cooling system for leakage.3-10 – 12
FuelCheck that a fresh gasoline is filled in the fuel tank.
Check the fuel line for leakage.1-30
Engine oilCheck that the oil level is correct. Check the crank-
case and oil line for leakage.3-16 – 18
Gear shifter and clutchCheck that gears can be shifted correctly in order and
that the clutch operates smoothly.3-12 – 13
Throttle grip/HousingCheck that the throttle grip operation and free play
are correctly adjusted. Lubricate the throttle grip and
housing, if necessary.3-13 – 14
BrakesCheck the play of front brake and effect of front and
rear brake.3-25 – 31
Drive chainCheck drive chain slack and alignment. Check that
the drive chain is lubricated properly.3-31
5-69 – 71
WheelsCheck for excessive wear and tire pressure. Check
for loose spokes and have no excessive play.3-36 – 37
SteeringCheck that the handlebar can be turned smoothly and
have no excessive play.3-37 – 38
Front forks and rear
shock absorberCheck that they operate smoothly and there is no oil
leakage.3-32 – 36
Cables (wires)Check that the clutch and throttle cables move
smoothly. Check that they are not caught when the
handlebars are turned or when the front forks travel
up and down.—
Exhaust pipeCheck that the exhaust pipe is tightly mounted and
has no cracks.3-15 – 16
Rear wheel sprocketCheck that the rear wheel sprocket tightening bolt is
not loose.5-10 – 11
LubricationCheck for smooth operation. Lubricate if necessary. 3-14
3-38 – 39
Bolts and nutsCheck the chassis and engine for loose bolts and
nuts.1-34 – 35
Lead connectorsCheck that the AC magneto, ECU and ignition coil are
connected tightly.1-9 – 12
SettingsIs the machine set suitably for the condition of the rac-
ing course and weather or by taking into account the
results of test runs before racing? Are inspection and
maintenance completely done?4-1 – 8

CHASSIS
3-25
EAS2GBB101
CHASSIS
EAS2GBB102BLEEDING THE BRAKE SYSTEMEWA
WARNING
Bleed the brake system whenever:
• The system is disassembled.
• A brake hose is loosened, disconnected,
or replaced.
• The brake fluid level is very low.
• Brake operation is faulty.
1. Remove:
• Brake master cylinder cap
• Reservoir diaphragm
• Reservoir float (front brake)
• Protector (rear brake)
TIP
• Be careful not to spill any brake fluid or allow
the reservoir to overflow.
• Make sure that there is enough brake fluid be-
fore applying the brake. Ignoring this precau-
tion could allow air to enter the brake system,
considerably lengthening the bleeding proce-
dure.
• If bleeding is difficult, it may be necessary to
let the brake fluid settle for a few hours. Re-
peat the bleeding procedure when the tiny
bubbles in the hose have disappeared.
2. Bleed the brake system.
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a. Fill the reservoir to the proper level with the
recommended brake fluid.
b. Install the reservoir diaphragm.
c. Connect the plastic hose “1” to the bleed
screw “2” securely, and place a container
under the end of the plastic hose.d. Slowly apply the brake several times.
e. Fully pull the brake lever or fully press down
the brake pedal and hold it in position.
f. Loosen the bleed screw.
TIP
Loosening the bleed screw will release the
pressure in the brake caliper and cause the
brake lever to contact the throttle grip or the
brake pedal to fully extend.
g. Tighten the bleed screw and then release
the brake lever or brake pedal.
h. Repeat steps (d) to (g) until all of the air bub-
bles have disappeared from the brake fluid
in the plastic hose.
TIP
During the procedure, keep adding brake fluid
to the reservoir.
ECA
NOTICE
• Wipe off any brake fluid on the brake
discs, tires, wheels, etc.
• Brake fluid may erode painted surfaces or
plastic parts. Always clean up spilled fluid
immediately.
i. Tighten the bleed screw.
j. Pour brake fluid to the reservoir up to the
specified level.
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-30.
EWA
WARNING
After bleeding the hydraulic brake system,
check the brake operation.
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1 2
A
A. Front
B. Rear
Bleed screw
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
2
1B
T R..

CHASSIS
3-36
Compression damping (for slow compres-
sion damping)
ECA
NOTICE
Do not turn the adjuster forcibly beyond its
adjusting range.
1. Adjust:
• Compression damping (for slow compres-
sion damping)
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a. Turn the adjuster “1” in the direction of “a” or
“b” to make an adjustment.
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EAS2GBB119CHECKING THE TIRES
1. Measure:
• Tire pressure
Out of specification  Regulate.
TIP
• Check the tire while it is cold.
• Loose bead stoppers allow the tire to slip off
its position on the rim when the tire pressure
is low.
• If the tire valve stem is found tilted, the tire is
considered to be slipping off its position. Cor-
rect the tire position.
EAS2GBB120CHECKING AND TIGHTENING THE
SPOKES
1. Check:
• Spokes
Bend/damage  Replace.
Loose  Tighten.
TIP
A tight spoke will emit a clear, ringing tone; a
loose spoke will sound flat.
2. Tighten:
• Spokes
Use a spoke nipple wrench “1” for tighten-
ing. Direction “a”
Compression damping is increased
(suspension is harder).
Direction “b”
Compression damping is decreased
(suspension is softer).
Compression damping setting
(for slow compression damping)
Maximum
Fully turned in
Standard
10 clicks out*
Minimum
20 clicks out*
* With the adjuster fully turned in
Tire air pressure (measured on cold
tires)
Front
100 kPa (1.00 kgf/cm
2, 15 psi)
Rear
100 kPa (1.00 kgf/cm
2, 15 psi)
1ba

4
TUNING
CHASSIS.......................................................................................................... 4-1
SELECTION OF THE SECONDARY REDUCTION RATIO
(SPROCKET) ............................................................................................ 4-1
DRIVE AND REAR WHEEL SPROCKETS SETTING PARTS .................. 4-1
TIRE PRESSURE....................................................................................... 4-1
FRONT FORK SETTING............................................................................ 4-2
CHANGE IN AMOUNT AND CHARACTERISTICS OF FORK OIL............ 4-2
SETTING OF SPRING AFTER REPLACEMENT ...................................... 4-2
FRONT FORK SETTING PARTS............................................................... 4-3
REAR SUSPENSION SETTING ................................................................ 4-3
CHOOSING SET LENGTH ........................................................................ 4-3
SETTING OF SPRING AFTER REPLACEMENT ...................................... 4-4
REAR SHOCK ABSORBER SETTING PARTS ......................................... 4-4
SUSPENSION SETTING (FRONT FORK)................................................. 4-6
SUSPENSION SETTING (REAR SHOCK ABSORBER) ........................... 4-7

CHASSIS
4-1
EAS2GBB136
CHASSIS
EAS2GBB137SELECTION OF THE SECONDARY REDUC-
TION RATIO (SPROCKET)
reduction ratio>
• It is generally said that the secondary gear ra-
tio should be reduced for a longer straight por-
tion of a speed course and should be
increased for a course with many corners. Ac-
tually, however, as the speed depends on the
ground condition of the day of the race, be
sure to run through the circuit to set the ma-
chine suitable for the entire course.
• In actuality, it is very difficult to achieve set-
tings suitable for the entire course and some
settings may be sacrificed. Thus, the settings
should be matched to the portion of the
course that has the greatest effect on the race
result. In such a case, run through the entire
course while making notes of lap times to find
the best balance; then, determine the second-
ary reduction ratio.
• If a course has a long straight portion where a
machine can run at maximum speed, the ma-
chine is generally set such that it can develop
its maximum revolutions toward the end of the
straight line, with care taken to avoid the en-
gine over-revving.
TIP
Riding technique varies from rider to rider and
the performance of a machine also vary from
machine to machine. Therefore, do not imitate
other rider’s settings from the beginning but
choose your own setting according to the level
of your riding technique.
EAS2GBB138DRIVE AND REAR WHEEL SPROCKETS
SETTING PARTS
EAS2GBB139TIRE PRESSURE
Tire pressure should be adjusted to suit the
road surface condition of the circuit.
• Under a rainy, a muddy, a sandy, or a slippery
condition, the tire pressure should be lower
for a larger area of contact with the road sur-
face. Secondary reduction ratio = Number of
rear wheel sprocket teeth/Number of
drive sprocket teeth
Secondary reduction ratio
3.846 (50/13)
Part name Type Part number
Drive sprocket “1”
(STD) 13T 9383B-13218
Rear wheel sprock-
et “2”
48T 5GS-25448-50
(STD) 50T 5TJ-25450-80
52T 5TJ-25452-80
Standard tire pressure
100 kPa (1.00 kgf/cm
2,15 psi)
Extent of adjustment
60–80 kPa (0.60–0.80 kgf/cm
2, 9–
12 psi)