Yamaha YZ450F(D) Owner's Service Manual page 125

REMOVING THE ROTOR
1. Remove:
• Nut (rotor) "1"
• Washer
2. Remove:
• Rotor "1"
Use the rotor puller "2".
Rotor puller:
YM-04151/90890-04151
CHECKING THE AC MAGNETO
1. Inspect:
• Rotor inner surface "a"
• Stator outer surface "b"
Damage → Inspect the crank-
shaft runout and crankshaft bear-
ing.
CHECKING THE WOODRUFF KEY
1. Inspect:
• Woodruff key "1"
Damage → Replace.
INSTALLING THE AC MAGNETO
1. Install:
• Stator "1"
• Screw (stator) "2"
Screw (stator):
8 Nm (0.8 m•kg,
5.8ft•lb)
• Crankshaft position sensor "3"
• Holder "4"
• Bolt (crankshaft position sensor)
"5"
Bolt (crankshaft position
sensor):
10 Nm (1.0 m•kg, 7.2
ft•lb)
• Apply the sealant on the grommet
of the AC magneto lead.
• Tighten the screws using the T30
bit.
• Pass the crankshaft position sensor
lead "a" this side of the stator lead
"b".
• Install the holder so that the projec-
tion "c" on the holder contacts the
stopper.
YAMAHA Bond No. 1215
®
(ThreeBond No. 1215):
90890-85505
2. Install:
• Woodruff key "1"
• Rotor "2"
• Degrease the contact surfaces of
the tapered portions of the crank-
shaft and rotor.
• When installing the woodruff key,
make sure that its flat surface "a" is
in parallel with the crankshaft center
line "b".
• When installing the rotor, align the
keyway "c" of the rotor with the
woodruff key.
4-44
AC MAGNETO
3. Install:
• Washer
• Nut (rotor) "1"
Nut (rotor):
65 Nm (6.5 m•kg, 47
ft•lb)
4. Connect:
• AC magneto lead
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
5. Install:
• Dowel pin
• Gasket (left crankcase cover)
• Left crankcase cover "1"
• Hose guide (cylinder head breath-
er hose) "2"
• Bolt (left crankcase cover)
Bolt (left crankcase cov-
er):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Tighten the bolts in stage, using a
crisscross pattern.