length YAMAHA WR 250F 2012 Owner's Manual

6-39
REAR SHOCK ABSORBER
2. Install:
• Stopper ring (upper bearing) "1"
After installing the stopper ring, push
back the bearing until it contacts the
stopper ring.
3. Install:
• Lower bearing "1"
Install the bearing by pressing it on
the side having the manufacture's
marks or numbers.
INSTALLING THE SPRING (REAR
SHOCK ABSORBER)
1. Install:
• Spring "1"
• Upper spring guide "2"
• Lower spring guide "3"
2. Tighten:
•Adjuster "1"3. Adjust:
• Spring length (installed)
Refer to "ADJUSTING THE
REAR SHOCK ABSORBER
SPRING PRELOAD" section in
the CHAPTER 3.
4. Tighten:
• Locknut "1"
INSTALLING THE REAR SHOCK
ABSORBER
1. Install:
• Dust seal "1"
• O-ring "2"
• Collar "3"
• Apply the molybdenum disulfide
grease on the dust seal lips and col-
lars.
• Apply the lithium soap base grease
on the O-rings.
2. Install:
• Bushing "1"
• Collar "2"
• Dust seal "3"
• Apply the molybdenum disulfide
grease on the bearing and dust seal
lips.
• Install the dust seals with their lips
facing inward.
3. Install:
• Rear shock absorber
4. Install:
• Bolt (rear shock absorber-frame)
"1"
• Washer "2"• Nut (rear shock absorber-frame)
"3"
Apply the molybdenum disulfide
grease on the bolt.
5. Install:
• Bolt (rear shock absorber-relay
arm)"1"
• Nut (rear shock absorber-relay
arm) "2"
Apply the molybdenum disulfide
grease on the bolt.
6. Install:
• Rear frame "1"
• Bolt [rear frame (upper)] "2"
• Bolt [rear frame (lower)] "3" Installed depth of the
bearing "a":
4 mm (0.16 in)
Nut (rear shock absorb-
er-frame):
56 Nm (5.6 m•kg, 40
ft•lb)
Nut (rear shock absorb-
er-relay arm):
53 Nm (5.3 m•kg, 38
ft•lb)
Bolt [rear frame (upper)]:
38 Nm (3.8 m•kg, 27
ft•lb)
Bolt [rear frame (lower)]:
32 Nm (3.2 m•kg, 23
ft•lb)

7-11
ELECTRIC STARTING SYSTEM
CHECKING AND REPAIRING THE
STARTER MOTOR
1. Check:
• Commutator
Dirt→Clean with 600 grit sandpa-
per.
2. Measure:
• Commutator diameter "a"
Out of specification→Replace the
starter motor.
3. Measure:
• Mica undercut "a"
Out of specification→Scrape the
mica to the proper measurement
with a hacksaw blade which has
been grounded to fit the commu-
tator.
The mica must be undercut to ensure
proper operation of the commutator.
4. Measure:
• Armature assembly resistances
(commutator and insulation)
Out of specification→Replace the
starter motor.
a. Measure the armature assembly
resistances with the pocket tester.b. If any resistance is out of specifi-
cation, replace the starter motor.
5. Measure:
• Brush length "a"
Out of specification→Replace the
brushes as a set.
6. Measure:
• Brush spring force
Out of specification→Replace the
brush springs as a set.ASSEMBLING THE STARTER
MOTOR
1. Install:
• Brush spring "1"
• Brush "2"
2. Install:
• Armature assembly "1"
Install while holding down the
brush using a thin screw driver.
Be careful not to damage the brush
during installation.
3. Install:
• Gasket "1"
• Starter motor yoke "2"
• Install the starter motor yoke with its
groove "a" facing front cover.
• Align the match mark "b" on the
starter motor yoke with the match
mark "c" on the starter motor rear
cover.
4. Install:
• Gasket "1"
• Circlip
• Plain washer "2"
• Washer (starter motor front cover)
"3"
• Starter motor front cover "4" Min. commutator diame-
ter:
16.6 mm (0.65 in)
Mica undercut:
1.5 mm (0.06 in)
Pocket tester:
YU-3112-C/90890-
03112
Armature assembly:
Commutator resis-
tance "1":
0.0189–0.0231 Ω at 20
°C (68 °F)
Insulation resistance
"2":
Above 1 MΩat 20 °C
(68 °F)
Min. brush length:
3.5 mm (0.14 in)
Brush spring force:
3.92–5.88 N (400–600
gf, 14.1–21.2 oz)