ELECTRIC STARTER
5-44
EAM30106
CHECKING THE STARTER MOTOR
1. Check:
•
Commutator
Dirt
Clean with 600 grit sandpaper.
2. Measure:
•
Mica undercut “a”
Out of specification
Scrape the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commutator.
TIP
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
3. Check:
•
Armature assembly
a. Connect the digital circuit tester to the ar-
mature coil and check the continuity.
b. If there is no continuity, replace the starter
motor.
4. Measure:
•
Brush length “a”
Out of specification
Replace the brush set.
5. Measure:
•
Brush spring force
Out of specification
Replace the brush set.
6. Check:
•
Gear teeth
Damage/wear
Replace the starter motor.
7. Check:
•
Oil seal
Damage/wear
Replace the defective
part(s).
EAM30107
ASSEMBLING THE STARTER MOTOR
1. Install:
•
Brush spring “1”
•
Brush “2”
TIP
Install the brush holder using the screws “a”.
2. Install:
•
Starter motor rear cover “1”
•
O-ring
•
Starter motor yoke “2”
TIP
Install the starter motor rear cover with its projec-
Mica undercut (depth)
2.40 mm (0.09 in)
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
Brush overall length limit
5.5 mm (0.22 in)
Brush spring force
4.80–7.20 N (489–734 gf, 17.28–
25.92 oz)
1
a
a
2
2
Ne
w
Summary of Contents for WR450F 2021
Page 5: ...EAM20093 YAMAHA MOTOR CORPORATION U S A WR MOTORCYCLE LIMITED WARRANTY...
Page 8: ......
Page 10: ......
Page 41: ...MULTI FUNCTION DISPLAY 1 29...
Page 62: ...ELECTRICAL SPECIFICATIONS 2 9 Radiator fan motor fuse 5 0 A Spare fuse 15 0 A...
Page 71: ...TIGHTENING TORQUES 2 18...
Page 72: ...CABLE ROUTING DIAGRAM 2 19 EAM20152 CABLE ROUTING DIAGRAM Frame and engine left side view...
Page 74: ...CABLE ROUTING DIAGRAM 2 21 Frame and engine right side view...
Page 76: ...CABLE ROUTING DIAGRAM 2 23 Handlebar front view...
Page 78: ...CABLE ROUTING DIAGRAM 2 25 Frame and engine top view...
Page 80: ...CABLE ROUTING DIAGRAM 2 27 Frame and battery top view...
Page 82: ...CABLE ROUTING DIAGRAM 2 29 Rear brake right side view...
Page 84: ...CABLE ROUTING DIAGRAM 2 31 Front brake front view and right side view...
Page 86: ...CABLE ROUTING DIAGRAM 2 33 Taillight top view and right side view...
Page 88: ...CABLE ROUTING DIAGRAM 2 35...
Page 205: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 3 1 Connecting rod 2 Oil nozzle 3 Crankshaft...
Page 207: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 5 1 Oil filter element 2 Oil pump 3 Oil strainer...
Page 286: ...WATER PUMP 6 9...
Page 296: ...THROTTLE BODY 7 9...
Page 299: ......
Page 300: ...IGNITION SYSTEM 8 1 EAM20142 IGNITION SYSTEM EAM30277 CIRCUIT DIAGRAM...
Page 304: ...ELECTRIC STARTING SYSTEM 8 5 EAM20143 ELECTRIC STARTING SYSTEM EAM30279 CIRCUIT DIAGRAM...
Page 310: ...CHARGING SYSTEM 8 11 EAM20144 CHARGING SYSTEM EAM30282 CIRCUIT DIAGRAM...
Page 313: ...CHARGING SYSTEM 8 14...
Page 314: ...SIGNALING SYSTEM 8 15 EAM20154 SIGNALING SYSTEM EAM30348 CIRCUIT DIAGRAM...
Page 318: ...LIGHTING SYSTEM 8 19 EAM20153 LIGHTING SYSTEM EAM30346 CIRCUIT DIAGRAM...
Page 321: ...LIGHTING SYSTEM 8 22...
Page 322: ...COOLING SYSTEM 8 23 EAM20155 COOLING SYSTEM EAM30350 CIRCUIT DIAGRAM...
Page 325: ...COOLING SYSTEM 8 26...
Page 326: ...FUEL INJECTION SYSTEM 8 27 EAM20145 FUEL INJECTION SYSTEM EAM30284 CIRCUIT DIAGRAM...
Page 351: ...FUEL INJECTION SYSTEM 8 52...
Page 352: ...FUEL PUMP SYSTEM 8 53 EAM20146 FUEL PUMP SYSTEM EAM30287 CIRCUIT DIAGRAM...
Page 386: ...SELF DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE 9 15...
Page 396: ...CHASSIS 10 9...
Page 398: ......
Page 400: ......