Yamaha WR450F(S) Owner's Service Manual page 456

AC MAGNETO AND STARTER CLUTCH
1
EC4L3000
REMOVAL POINTS
Rotor
1. Remove:
G
G
2
2. Remove:
G
EC4L4000
INSPECTION
AC magneto
1. Inspect:
G
G
EC4L4200
Woodruff key
1. Inspect:
G
4 - 78
Nut (rotor) 1
Plain washer
Use the sheave holder 2.
Sheave holder:
YS-1880-A/90890-01701
Rotor 1
Use the rotor puller 2.
Rotor puller:
YM-04142/90890-04142
Rotor inner surface a
Stator outer surface b
Damage → Inspect the crankshaft
runout and crankshaft bearing.
If necessary, replace AC magneto and/
or stator.
Woodruff key 1
Damage → Replace.
ENG