Cdi Magneto - Yamaha YZ450F(X) Owner's Service Manual

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 CDI MAGNETO
1. Inspect:
• Rotor inner surface "a"
• Stator outer surface "b"
→
Damage Inspect the crankshaft
runout and crankshaft bearing.
If necessary, replace CDI magne-
to and/or stator.
CHECKING THE WOODRUFF KEY
1. Inspect:
• Woodruff key "1"
→
Damage Replace.
INSTALLING THE CDI MAGNETO
1. Install:
• Stator "1"
• Screw (stator) "2"
Screw (stator):
10 Nm (1.0 m•kg,
7.2ft•lb)
• Apply the sealant on the grommet
of the CDI magneto lead.
• Tighten the screws using the T30
bit.
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.
3. Install:
• Washer
• Nut (rotor) "1"
Nut (rotor):
56 Nm (5.6 m•kg, 40
ft•lb)
4. Connect:
• CDI magneto lead
Refer to "CABLE ROUTING DIA-
GRAM" section in the CHAPTER
2.
4-48

CDI MAGNETO

5. Install:
• Dowel pin
• O-ring
• 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)
• Apply the lithium soap base grease
on the O-ring.
• Tighten the bolts in stage, using a
crisscross pattern.