2017 YAMAHA WR 250F Owners Manual

REAR BRAKE
5-31
EAS2GBB191ASSEMBLING THE REAR BRAKE MASTER
CYLINDER
EWA
WARNING
• Before installation, all internal brake com-
ponents should be cleaned and lubricated
with clean or new brake fluid.
• Never use solvents on internal brake com-
ponents.
1. Wash the brake master cylinder and the
brake master cylinder kit with brake fluid.
2. Install:
• Primary cylinder cup “1”
• Secondary cylinder cup “2”
Install to the brake master cylinder piston
“3”.
EWA
WARNING
Apply brake fluid to the cylinder cups and
install them as shown. Wrong orientation in
installation causes poor braking perfor-
mance.
3. Install:
• Spring “1”
Install to the brake master cylinder piston
“2”.
TIP
Install the spring with a smaller inside diameter
to the brake master cylinder piston.4. Install:
• Master cylinder kit “1”
• Push rod “2”
• Circlip “3”
• Dust boot “4”
TIP
• Before installation, apply brake fluid to the
brake master cylinder kit.
• Before installation, apply silicone grease to
the push rod end.
• Use circlip pliers to install the circlip.
EAS2GBB192INSTALLING THE REAR BRAKE MASTER
CYLINDER
1. Install:
• Copper washers
• Brake hose
• Union bolt
EWA
WARNING
Proper brake hose routing is essential to in-
sure safe vehicle operation.
ECA
NOTICE
Make sure that the pipe portion of the brake
hose touches the projection “a” on the
brake caliper. Specified brake fluid
DOT 4
2
3
1
2
3
1Brake hose union bolt
30 Nm (3.0 m·kgf, 22 ft·lbf)
12
New
New
13
4
2NewNew
New
T R..

REAR BRAKE
5-32
2. Pour brake fluid to the brake fluid reservoir
up to the specified level.
EWA
WARNING
• Use only the designated brake fluid. Other
brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
brake performance.
• Refill with the same type of brake fluid that
is already in the system. Mixing brake flu-
ids may result in a harmful chemical reac-
tion, leading to poor brake performance.
• When refilling, be careful that water does
not enter the brake fluid reservoir. Water
will significantly lower the boiling point of
the brake fluid and could cause vapor
lock.
ECA
NOTICE
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean
up any spilt brake fluid immediately.
3. Bleed:
• Brake system
Refer to “BLEEDING THE BRAKE SYS-
TEM” on page 3-25.
4. Check:
• Brake fluid level
The minimum level mark “a” or below 
Add.
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-30.5. Check:
• Brake pedal operation
A softy or spongy feeling  Bleed the brake
system.
Refer to “BLEEDING THE BRAKE SYS-
TEM” on page 3-25. Specified brake fluid
DOT 4
a
a

HANDLEBAR
5-33
EAS2GBB193
HANDLEBAR
Removing the handlebar
Order Part name Q’ty Remarks
1 Clutch cable 1 Disconnect.
2 Clutch switch 1
3 Clutch lever holder 1
4 Engine stop switch 1
5 Brake master cylinder 1
6 Throttle cable cap 1
7 Throttle cable (pull) 1 Disconnect.
8 Throttle cable (return) 1 Disconnect.
9 Right grip 1
10 Tube guide 1
11 Start switch 1
12 Left grip 1
13 Upper handlebar holder 2
14 Handlebar 1

HANDLEBAR
5-34
15 Lower handlebar holder 2
16 Damper 4
For installation, reverse the removal proce-
dure.
Removing the handlebar
Order Part name Q’ty Remarks

HANDLEBAR
5-35
EAS2GBB194REMOVING THE HANDLEBAR
1. Stand the vehicle on a level surface.
EWA
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Remove:
•Clutch switch “1”
TIP
Press the projection, and remove it from the
clutch lever assembly.
3. Remove:
• Handlebar grip “1”
TIP
Blow compressed air between the left handle-
bar and the handlebar grip, and gradually push
the grip off the handlebar.
4. Remove:
• Throttle cable housings “1”
• Throttle grip “2”
TIP
While removing the throttle cable housing, pull
back the rubber cover “3”.
EAS2GBB195CHECKING THE HANDLEBAR
1. Check:
• Handlebar
Bends/cracks/damage  Replace.
EWA
WARNING
Do not attempt to straighten a bent handle-
bar as this may dangerously weaken it.
EAS2GBB196INSTALLING THE HANDLEBAR
1. Stand the vehicle upright on a level surface.
EWA
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Install:
• Damper “1”
• Lower handlebar holders“2” (temporarily)
• Handlebar “3”
• Upper handlebar holders “4”
TIP
• Install the lower handlebar holders with them
side having the greater distance “a” from the
mounting bolt center facing forward.
• Installing the lower handlebar holders in the
reverse direction allow the front-to-rear offset
amount of the handlebar position to be
changed.
• The upper handlebar holders should be in-
stalled with the punch marks “b” facing for-
ward.
• When installing the handlebar, make sure that
right and left marks “c” are in place identically
on both sides.
• Install the handlebar so that the projection “d”
of the upper handlebar holders is positioned
at the mark on the handlebar as shown.
ECA
Upper handlebar holder bolt
28 Nm (2.8 m·kgf, 20 ft·lbf)
T R..

HANDLEBAR
5-36
NOTICE
• First, tighten the bolts on the front side of
the upper handlebar holder, and then on
the rear side.
• Turn the handlebar all the way to the left
and right. If there is any contact with the
fuel tank, adjust the handlebar position.
3. Tighten:
• Lower handlebar holder nut
4. Install:
• Handlebar grip “1”
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Slightly coat the handlebar left end with a
rubber adhesive.
b. Install the handlebar grip on the handlebar
by pressing the grip from the left side.
c. Wipe off any excess adhesive with a clean
cloth.
EWA
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
TIP
Install the handlebar grip to the handlebar so
that the line “a” between the two arrow marks
faces straight upward.
2
1
1
a
3
4
Lower handlebar holder nut
40 Nm (4.0 m·kgf, 29 ft·lbf)
T R..

HANDLEBAR
5-37
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
5. Install:
• Engine stop switch “1”
• Clutch lever “2”
• Clutch lever holder “3”
•Clamp “4”
TIP
• The engine stop switch, the clutch lever, and
the clutch lever holder should be installed ac-
cording to the dimensions shown.
• Pass the engine stop switch lead through the
middle of the clutch lever holder.
6. Install:
• Right grip “1”
• Collar “2”
Apply adhesive to the tube guide “3”.
TIP
• Before applying the adhesive, wipe off grease
or oil on the tube guide surface “a” with a lac-
quer thinner.
• Install the grip to the tube guide so that the
grip match mark “b” and tube guide slot “c”
form the angle as shown.7. Install:
• Rubber cover “1”
• Throttle grip “2”
TIP
Apply the lithium-soap-based grease on the
throttle grip sliding surface.
8. Install:
• Throttle cables “1”
TIP
Slightly coat the end of throttle cable and inside
of throttle grip with lithium-soap-based grease.
Then, mount the throttle grip onto the handle-
bar. Engine stop switch screw
0.5 Nm (0.05 m·kgf, 0.36 ft·lbf)
Clutch lever holder bolt
3.8 Nm (0.38 m·kgf, 2.8 ft·lbf)
T R..
64
1b
c
3 64

HANDLEBAR
5-38
9. Install:
• Throttle cable housings “1”
• Screw (throttle cable housings) “2”
EWA
WARNING
After tightening the throttle cable housing
screws, check that the throttle grip “3”
moves smoothly. If it does not, retighten the
screws for adjustment.
10.Install:
• Rubber cover “1”
• Cover (throttle cable housings) “2”11.Install:
• Start switch “1”
• Front brake master cylinder assembly “2”
• Front brake master cylinder holder “3”
• Bolt (brake master cylinder holder) “4”
•Clamp “5”TIP
• Install the brake master cylinder holder with
the “UP” mark facing up.
• Install in order for the top of the front brake
master cylinder assembly to be level.
• First, tighten the upper bolt, then the lower
bolt. Screw (throttle cable housings)
3.8 Nm (0.38 m·kgf, 2.8 ft·lbf)
T R..
Front brake master cylinder hold-
er bolt
9 Nm (0.9 m·kgf, 6.5 ft·lbf)
T R..
2
5
1
4
3
4