brake YAMAHA WR 250F 2017 Owner's Manual

3
PERIODIC CHECKS AND ADJUSTMENTS
PERIODIC MAINTENANCE............................................................................. 3-1
INTRODUCTION ........................................................................................ 3-1
PERIODIC MAINTENANCE CHART FOR THE EMISSION CONTROL
SYSTEM .................................................................................................... 3-1
GENERAL MAINTENANCE AND LUBRICATION CHART ........................ 3-2
MAINTENANCE INTERVALS FOR COMPETITION USE ......................... 3-4
PRE-OPERATION INSPECTION AND MAINTENANCE................................. 3-9
GENERAL INSPECTION AND MAINTENANCE........................................ 3-9
ENGINE.......................................................................................................... 3-10
CHECKING THE COOLANT LEVEL ........................................................ 3-10
CHECKING THE COOLING SYSTEM ..................................................... 3-10
CHANGING THE COOLANT.................................................................... 3-10
CHECKING THE RADIATOR CAP .......................................................... 3-11
CHECKING THE RADIATOR CAP VALVE OPENING PRESSURE ....... 3-11
CHECKING THE COOLANT CIRCULATORY SYSTEM FOR LEAKS .... 3-12
ADJUSTING THE CLUTCH LEVER FREE PLAY .................................... 3-12
ADJUSTING THE THROTTLE GRIP FREE PLAY .................................. 3-13
LUBRICATING THE THROTTLE CABLE ................................................ 3-14
CLEANING THE AIR FILTER ELEMENT................................................. 3-14
CHECKING THE THROTTLE BODY JOINT ............................................ 3-15
CHECKING THE BREATHER HOSES .................................................... 3-15
CHECKING THE EXHAUST SYSTEM..................................................... 3-15
CHECKING THE FUEL LINE ................................................................... 3-16
CHECKING THE ENGINE OIL LEVEL..................................................... 3-16
CHANGING THE ENGINE OIL ................................................................ 3-17
ADJUSTING THE ENGINE IDLING SPEED ............................................ 3-18
ADJUSTING THE VALVE CLEARANCE ................................................. 3-19
CLEANING THE SPARK ARRESTER ..................................................... 3-24
CHASSIS........................................................................................................ 3-25
BLEEDING THE BRAKE SYSTEM .......................................................... 3-25
CHECKING THE BRAKE HOSE .............................................................. 3-26
ADJUSTING THE FRONT BRAKE .......................................................... 3-26
ADJUSTING THE REAR BRAKE ............................................................. 3-27
CHECKING THE FRONT BRAKE PADS ................................................. 3-27
CHECKING THE REAR BRAKE PADS ................................................... 3-29
CHECKING THE REAR BRAKE PAD INSULATOR ................................ 3-30
CHECKING THE BRAKE FLUID LEVEL.................................................. 3-30
ADJUSTING THE DRIVE CHAIN SLACK ................................................ 3-31
CHECKING THE FRONT FORK LEGS ................................................... 3-32
CHECKING THE FRONT FORK PROTECTOR GUIDE .......................... 3-32
CLEANING THE FRONT FORK OIL SEAL AND DUST SEAL ................ 3-32
AIR BLEEDING FROM FRONT FORK .................................................... 3-32
ADJUSTING THE FRONT FORK LEGS .................................................. 3-33
CHECKING THE SWINGARM OPERATION ........................................... 3-34
CHECKING THE REAR SUSPENSION ................................................... 3-34

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).

PERIODIC MAINTENANCE
3-3
TIP
• The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
• Hydraulic brake service
• After disassembling the brake master cylinders and calipers, always change the fluid. Regularly
check the brake fluid levels and fill the reservoirs as required.
• Every two years replace the internal components of the brake master cylinders and calipers, and
change the brake fluid.
• Replace the brake hoses every four years and if cracked or damaged.
13
Brake and
clutch lever
pivot shafts• Apply lithium-soap-based grease (all-
purpose grease) lightly.
14Brake pedal
pivot shafts• Apply lithium-soap-based grease (all-
purpose grease) lightly.
15Sidestand
pivot• Check operation.
• Apply lithium-soap-based grease (all-
purpose grease) lightly.
16*Front fork• Check operation and for oil leakage.
• Replace if necessary.
17*Shock ab-
sorber as-
sembly• Check operation and for oil leakage.
• Replace if necessary.
18*Rear sus-
pension link
pivots• Apply molybdenum disulfide grease
lightly.
19*Control ca-
bles• Apply Yamaha chain and cable lube or
engine oil 10W-30 thoroughly.
20*Throttle grip
housing and
cable• Check operation and free play.
• Adjust the throttle cable free play if
necessary.
• Lubricate the throttle grip housing and
cable.
21*Chassis fas-
teners• Check all chassis fitting and fasteners.
• Correct if necessary.
22Battery• Check terminal for looseness and cor-
rosion. 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

PERIODIC MAINTENANCE
3-7
BRAKES
Adjust lever posi-
tion and pedal
height
Lubricate pivot
point
Check brake disc
surface
Check fluid level
and leakage
Retighten brake
disc bolts, caliper
bolts, master cylin-
der bolts and union
bolts
Replace pads
Replace brake flu-
idEvery one year
FRONT FORKS
Inspect and adjust
Replace oil Yamaha Suspension Oil S1
Replace oil seal
FRONT FORK OIL
SEAL AND DUST
SEAL
Clean and lube Lithium-soap-based grease
PROTECTOR
GUIDE
Replace
REAR SHOCK AB-
SORBER(After
rain
ride)
Inspect and adjust
Lube Molybdenum disulfide grease
Retighten
DRIVE CHAIN
GUARD AND ROLL-
ERS
Inspect
DRIVE CHAIN
STOPPER
InspectITEMAfter
break-
inEvery
raceEvery
third
(or
500
km)Every
fifth
(or
1,000
km)As re-
quiredRemarks

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.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
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.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
1 2
A
A. Front
B. Rear
Bleed screw
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
2
1B
T R..

CHASSIS
3-26
EAS2GBB103CHECKING THE BRAKE HOSE
1. Check:
• Brake hose “1”
Cracks/damage/wear  Replace.
2. Check:
• Brake hose clamp
Loose connection  Tighten the clamp bolt.
3. Stand the vehicle upright and apply the front
brake and the rear brake several times.
4. Check:
• Brake hoses
Brake fluid leaks  Replace the damaged
brake hose.
Refer to “FRONT BRAKE” on page 5-13.
Refer to “REAR BRAKE” on page 5-23.
EAS2GBB104ADJUSTING THE FRONT BRAKE
1. Check:
• Brake lever position “a”2. Remove:
• Brake lever cover
3. Adjust:
• Brake lever position
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Loosen the locknut “1”.
b. Turn the adjusting bolt “2” in direction “a” or
“b” until the specified brake lever position is
obtained.
c. Tighten the locknut.
EWA
WARNING
A soft or spongy feeling in the brake lever
can indicate the presence of air in the brake
system. Before the vehicle is operated, the
air must be removed by bleeding the brake
system. Air in the brake system will consid-
erably reduce braking performance.
ECA
NOTICE
After adjusting the brake lever position,
make sure there is no brake drag.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
4. Install:
• Brake lever cover
A. Front
B. Rear
Brake lever position
95 mm (3.74 in)
Extent of adjustment
76–97 mm (2.99–3.82 in)
1
1
Direction “a”
Brake lever position is increased.
Direction “b”
Brake lever position is decreased.
Locknut
5 Nm (0.5 m·kgf, 3.6 ft·lbf)
a
b
T R..

CHASSIS
3-27
EAS2GBB105ADJUSTING THE REAR BRAKE
1. Check:
• Brake pedal position “a”
(distance from the top of the rider footrest to
the top of the brake pedal)
Out of specification  Regulate.
2. Adjust:
• Brake pedal position
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Loosen the locknut “1”.
b. Turn the adjusting bolt “2” in direction “a” or
“b” until the specified brake pedal position is
obtained.
c. Tighten the locknut.
EWA
WARNING
A soft or spongy feeling in the brake pedal
can indicate the presence of air in the brake
system. Before running, bleed the brake
system. Air in the brake system will cause
braking performance to be reduced.
ECA
NOTICE
After adjusting the brake pedal position,
make sure that there is no brake drag.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS2GBB106CHECKING THE FRONT BRAKE PADS
1. Measure:
• Brake pad thickness “a”
Out of specification  Replace as a set.
TIP
The pads worn up to the indicator “b” grooves
mean that the brake pad thickness limit is
reached.
2. Replace:
• Brake pads
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the pad pin plug “1”.
b. Loosen the pad pin “2”. Brake pedal position
5.0 mm (0.20 in)
Direction “a”
Brake pedal is raised.
Direction “b”
Brake pedal is lowered.
Locknut
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
1 2
a
b
T R..
Brake pad lining thickness
4.4 mm (0.17 in)
Limit
1.0 mm (0.04 in)
a
b
a
1

CHASSIS
3-28
c. Remove the brake caliper “3” from the front
fork.
d. Remove the pad pin and brake pads “4”.
e. Connect the plastic hose “5” to the bleed
screw “6” and place a container under the
end of the plastic hose.
f. Loosen the bleed screw and push the brake
caliper piston in.
EWA
WARNING
Do not reuse the drained brake fluid.
g. Tighten the bleed screw.
h. Install the brake pads “7” and the pad pin.
TIP
• Install the brake pads with their projections “a”
into the brake caliper recesses “b”.
• Temporarily tighten the pad pin at this point.i. Install the brake caliper “8” and tighten the
pad pin “9”.
j. Install the pad pin plug “10”.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
3. Check:
• Brake fluid level
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-30.
4. Check:
• Brake lever operation
A softy or spongy feeling  Bleed the brake
system.
Refer to “BLEEDING THE BRAKE SYS-
TEM” on page 3-25. Bleed screw
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
3
2
4
6
5
T R..
Bolt (brake caliper)
23 Nm (2.3 m·kgf, 17 ft·lbf)
Pad pin
17 Nm (1.7 m·kgf, 12 ft·lbf)
Pad pin plug
2.5 Nm (0.25 m·kgf, 1.8 ft·lbf)
7
a b
T R..
8
9
T R..
10

CHASSIS
3-29
EAS2GBB107CHECKING THE REAR BRAKE PADS
1. Measure:
• Brake pad thickness “a”
Out of specification  Replace as a set.
TIP
The pads worn up to the indicator “b” grooves
mean that the brake pad thickness limit is
reached.
2. Replace:
• Brake pads
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the protector “1” and the pad pin
plug “2”.
b. Loosen the pad pin “3”.
c. Remove the rear wheel “4” and the brake
caliper “5”.
Refer to “REAR WHEEL” on page 5-9.d. Remove the pad pin “6” and the brake pads
“7”.
e. Connect the plastic hose “8” to the bleed
screw “9” and place a container under the
end of the plastic hose.
f. Loosen the bleed screw and push the brake
caliper piston in.EWA
WARNING
Do not reuse the drained brake fluid.
g. Tighten the bleed screw.
h. Install the brake pad “10” and the pad pin
“11”.
TIP
• Install the brake pads with their projections “a”
into the brake caliper recesses “b”.
• Temporarily tighten the pad pin at this point. Brake pad lining thickness
6.4 mm (0.25 in)
Limit
1.0 mm (0.04 in)
ba
a
1 2
34
5
Bleed screw
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
7 6
9
8
T R..
10 11
a
b