2008 YAMAHA WR 250F Owners Manual

2-22
CABLE ROUTING DIAGRAM
A. Insert the end of the fuel tank breather hose into the hole in
the steering stem.
B. Fasten the throttle cable, hot
starter cable and rectifier/regula-
tor lead onto the frame. Locate
the clamp end facing the lower
side of the hot starter cable and
cut off the tie end.
C. Fasten the diode (at the mark-
ing), throttle cable and hot start-
er cable onto the frame. Locate
the clamp end facing toward the
lower right of the frame and with
the tie end facing downward.
D. Fasten the wire harness, throttle
position sensor lead, starter mo-
tor lead and negative battery
lead onto the frame. Pass the
clamp through the hole in the
stay (air cut-off valve). Locate
the clamp end facing toward the
lower side of the frame and cut
off the tie end.
E. Fasten the throttle position sen-
sor lead onto the frame. Locate
the clamp end facing toward the
lower side of the frame and cut
off the tie end.
F. Pass the carburetor breather hoses, carburetor overflow hose
and catch tank breather hose
between the connecting rod and
cross tube (frame).
G. Fasten the neutral switch lead and oil hose together with the
plastic locking ties and cut off
the tie ends.
H. Fasten the neutral switch lead
and AC magneto lead onto the
frame. Locate the clamp end
facing toward the outside of the
frame and tie end facing toward
the rear of the frame.
I. Pass the clutch cable through
the cable guide.
J. Fasten the starter motor lead, AC magneto lead and neutral
switch lead onto the frame. Lo-
cate the clamp end facing to-
ward the rear of the frame and
cut off the tie end.
K. Fasten the clutch cable, starter motor lead, negative battery
lead, AC magneto lead and neu-
tral switch lead onto the frame.
Locate the clamp end facing to-
ward the rear of the frame and
cut off the tie end.
L. Pass the neutral switch lead and
AC magneto lead on the inside
of the wire harness. M. Fasten the clutch cable, AC
magneto lead and neutral switch
lead onto the frame. Locate the
clamp end near the clutch cable
and cut off the tie end.
N. Pass the clutch cable and wire harness through the cable
guide.
O. Locate the couplers in the frame recess.
P. Pass the carburetor breather hoses, carburetor overflow hose
and catch tank breather hose so
that the hoses do not contact the
rear shock absorber.
Q. Secure the coupler by pushing it
into the hole in the headlight
unit.

2-23
CABLE ROUTING DIAGRAM
1. Throttle cable (pull)
2. Throttle cable (return)
3. Catch tank hose
4. Ignition coil
5. Clamp
6. Air induction hose (air cut-off valve - rear of cylinder head)
7. Catch tank breather hose
A. Cross the pull and push throttle cables. B. Fasten the catch tank hose and
air induction hose (air cut-off
valve-rear of cylinder head) onto
the frame. Locat e the clamp end
facing toward the lower side of
the frame and cut off the tie end.
C. Fasten the catch tank breather hose and carburetor breather
hoses together. D. Pass the carburetor breather
hose (of the throttle cable cover)
through the hose holder.

2-24
CABLE ROUTING DIAGRAM
1. Brake master cylinder
2. Brake hose holder
3. Brake hose
A. Install the brake hose so that its
pipe portion directs as shown
and lightly touches the projec-
tion on the brake caliper.
B. Pass the brake hose into the
brake hose holders. C. If the brake hose contacts the
spring (rear shock absorber),
correct its twist.
D. Install the brake hose so that its pipe portion directs as shown
and lightly touches the projec-
tion on the brake master cylin-
der.

2-25
CABLE ROUTING DIAGRAM
1. Clamp
2. Positive battery lead
3. Battery
4. Negative battery lead
5. Taillight coupler
6. CDI unit coupler (6-pin)
7. CDI unit coupler (3-pin)
8. CDI unit coupler (6-pin)A. Fasten the wire harness, nega-
tive battery lead and starter mo-
tor lead to the upper engine
bracket (left side). Locate the
clamp end facing toward the up-
per side of the frame with the tie
end cut off on the inside of the
frame. B. Fasten the wire harness, nega-
tive battery lead and starter mo-
tor lead to the upper engine
bracket (left side). Locate the
clamp end facing toward the up-
per side of the frame with the tie
end cut off on the inside of the
frame. Clamp the wire harness
and negative lead at the mark-
ing.

2-26
CABLE ROUTING DIAGRAM
C. Pass the starter motor lead through the hole in the relay
holder.
D. Fit the cover securely.
E. Connect the wire harness to the starter relay.
F. Fasten the catch tank breather
hose and catch tank hose to the
rear frame. Clamp them close to
where they are joined to the
frame. Fasten the pipe tightly
enough not to crush it. Locate
the clamp end facing toward the
rear of the frame with the tie end
facing downward.
G. Fasten the (three) CDI unit leads
and taillight lead to the rear
frame. Locate the clamp end
facing toward the upper side of
the frame and cut off the tie end.
H. Connect the negative battery lead to the battery negative ter-
minal.
I. Connect the negative battery lead to the wire harness.
J. Fasten the wire harness to the rear frame. Locate the clamp
end facing toward the upper side
of the frame and the tie end to-
ward the inside of the frame.
Clamp the wire harness at the
marking.
K. Pass the wire harness, starter relay lead, starting circuit cut-off
relay lead and negative battery
lead through the hole in the relay
holder.
L. Fasten the (three) CDI unit leads and taillight lead to the rear
frame. Locate the clamp end
facing toward the lower side of
the frame and cut off the tie end.
M. Fasten the taillight lead to the rear frame. Locate the clamp
end facing toward the upper side
of the frame and cut off the tie
end.
N. Do not allow the taillight lead to
slacken.
O. Locate the CDI unit lead be- tween the CDI unit and rear
fender.
P. Locate the CDI unit coupler in the clearance between the up-
per side of the CDI unit and low-
er side of the catch tank stay.
Q. Locate the CDI unit lead be-
tween the CDI unit and rear
frame.

2-27
CABLE ROUTING DIAGRAM
1. Throttle cable
2. Clamp
3. Brake hose
4. Clutch cable
5. Hose guide
6. Main switch coupler
7. Wire harness
8. Headlight coupler
9. Hot starter cable
10. Multi-function display bracket
11. Main switch12. Upper bracket
13. Clutch switch coupler
14. Engine stop switch coupler
15. Multi-function display coupler
16. Start switch coupler
17. Speed sensor coupler
18. Speed sensor lead
A. Fasten the star
t switch lead to
the handlebar with the plastic
bands. B. Fasten the engine stop switch
lead and clutch switch lead to
the handlebar with the plastic
bands.
C. Pass the brake hose through
the hose guides.
D. Secure the coupler by inserting it into the multi-function display
bracket.

2-28
CABLE ROUTING DIAGRAM
E. Pass the throttle cables, clutch cable and hot starter cable be-
tween the upper bracket and
multi-function display bracket.
F. Fasten the multi-function display leads to the bracket. Cut off the
tie end.
G. Secure the coupler by pushing it into the hole in the multi-function
display bracket.
H. Secure the wire harness clip by pushing it into the hole in the
multi-function display bracket on
the inside.
I. Fasten the wire harness to the multi-function display bracket.
Cut off the tie end.
J. Fasten the main switch lead (wire harness side) to the multi-
function display br acket. Locate
the clamp end facing toward the
lower side of the frame and cut
off the tie end.
K. Pass the speed sensor lead through the guide on the outside
of the front fork.

3-1
MAINTENANCE INTERVALS
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS
The following schedule is intended as a general guide to maint enance and lubrication. Bear in mind that such factors as
weather, terrain, geographical location, and individual usage will alter the required maintenance and lubrication intervals. If
you are a doubt as to what intervals to follow in maintaini ng and lubricating your machine, consult your Yamaha dealer.
ItemAfter
break- in Every
race
Every third
(or 500
km) Every
fifth (or 1,000
km)
As re-
quired Remarks
ENGINE OIL Replace ●●
VALVES Check the valve clearances ●● The engine must be cold.
Inspect ●Check the valve seats and valve
stems for wear.
Replace ●
VALVE SPRINGS Inspect ●Check the free length and the tilt.
Replace ●
VALVE LIFTERS Inspect ●Check for scratches and wear.
Replace ●
CAMSHAFTS Inspect the camshaft surface.
Inspect ●Inspect the decompression system.
Replace ●
CAMSHAFT SPROCKETS Inspect ●Check for wear on the teeth and for
damage.
Replace ●
PISTON Inspect ●●Inspect crack.
Clean ●Inspect carbon deposits and eliminate
them.
Replace ●
PISTON RING Inspect ●Check ring end gap.
Replace ●●
PISTON PIN Inspect ●
Replace ●
CYLINDER HEAD Inspect carbon deposits and eliminate
them.
Inspect and clean ●Change gasket.
CYLINDER Inspect and clean ●Inspect score marks.
Replace ●Inspect wear.