starter YAMAHA WR 450F 2010 Workshop Manual

7-7
ELECTRIC STARTING SYSTEM
CHECKING THE COUPLERS AND
LEADS CONNECTION
1. Check:
• Couplers and leads connection
Rust/dust/looseness/short-circuit
→Repair or replace.
CHECKING THE STARTER
MOTOR OPERATION
1. Connect the positive battery ter-
minal "1" and starter motor lead
"2" with a jumper lead "3".
Not operate→Repair or replace
the starter motor.
• A wire that is used as a jumper
lead must have at least the same
capacity or more as that of the
battery lead, otherwise the jump-
er lead may burn.
• This check is likely to produce
sparks, therefore make sure
nothing flammable is in the vicin-
ity.
CHECKING THE STARTING
CIRCUIT CUT-OFF RELAY
1. Remove:
• Starting circuit cut-off relay
2. Inspect:
• Starting circuit cut-off relay con-
duction
Use 12 V battery.
Not conductive while the battery is
connected→Replace.
Conductive while the battery is not
connected→Replace.
Set the tester selection position to "Ω
× 1".
CHECKING THE STARTER RELAY
1. Remove:
• Starter relay
2. Inspect:
• Starter relay conduction
Use 12 V battery.
Not conductive while the battery is
connected→Replace.
Conductive while the battery is not
connected →Replace.
Set the tester selection position to "Ω
× 1".
CHECKING THE CLUTCH SWITCH
1. Inspect:
• Clutch switch conduction
Not conductive while it is pulled→Re-
place.
Conductive while it is freed→Re-
place.
Set the tester selection position to "Ω
× 1".
CHECKING THE DIODE
1. Remove the diode from wire har-
ness.
2. Inspect:
• Diode continuity
Use pocket tester (tester selec-
tion position Ω × 1)
Incorrect continuity→Replace. Battery (+) lead→Blue/Black lead
"1"
Battery (-) lead→Brown lead "2"
Tester (+) lead→Blue/White lead
"3"
Tester (-) lead→Black lead "4"
Result
Conductive (while the
battery is connected)
Battery (+) lead→Starter relay ter-
minal "1"
Battery (-) lead→Starter relay ter-
minal "2"
Tester (+) lead→Starter relay ter-
minal "3"
Tester (-) lead→Starter relay ter-
minal "4"
Result
Conductive (while the
battery is connected)
Tester (+) lead→Black lead "1"
Tester (-) lead→Black lead "2"
Result
Conductive (while the
clutch lever is pulled)
Tester (+)→Blue/Red
terminal "1"
Tester (-) →Sky blue
terminal "2"Continu-
ous
Tester (+)→Blue/Red
terminal "1"
Tester (-)→Blue/Yel-
low terminal "3"Continu-
ous
Tester (+)→Sky blue
terminal "2"
Tester (-)→Blue/Red
terminal "1"No con-
tinuous
Tester (+)→Blue/Yel-
low terminal "3"
Tester (-)→Blue/Red
terminal "1"No con-
tinuous

7-9
ELECTRIC STARTING SYSTEM
REMOVING THE STARTER MOTOR
Order Part name Q'ty Remarks
Exhaust pipeRefer to "REMOVING THE EXHAUST PIPE
AND SILENCER" section in the CHAPTER 3.
1 Starter motor 1

7-10
ELECTRIC STARTING SYSTEM
DISASSEMBLING THE STARTER MOTOR
Order Part name Q'ty Remarks
1 Starter motor front cover 1
2 Washer (starter motor front cover) 1
3 Washer 1
4 Circlip 1
5O-ring 1
6 Starter motor yoke 1
7 Armature assembly 1
8 Starter motor rear cover 1
9 Brush 2
10 Brush spring 2

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:
• O-ring "1"
• Starter motor yoke "2"
• Align the match mark "a" on the
starter motor yoke with the match
mark "b" on the starter motor rear
cover.
• Install the starter motor yoke with its
groove "c" facing rear cover.
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":
0.0117–0.0143 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)

7-12
ELECTRIC STARTING SYSTEM
4. Install:
• O-ring "1"
• Circlip
• Plain washer "2"
• Washer (starter motor front cover)
"3"
• Starter motor front cover "4"
• For installation, align the projec-
tions on the washer with the slots in
the front cover.
• Align the match mark "a" on the
starter motor yoke with the match
mark "b" on the starter motor front
cover.
5. Install:
•Bolt "1"
• O-ring "2"
Apply the lithium soap base grease
on the O-ring.