Yamaha YZ450F 2021 - Removing the Camshaft

CAMSHAFT
5-15
EAM30080
REMOVING THE CAMSHAFT
1. Remove:
• Timing mark accessing screw “1”
• Crankshaft end accessing screw “2”
2. Align:
• Alignment mark
a. Turn the crankshaft counterclockwise with
a wrench.
b. Align the top dead center (TDC) mark “a”
on the generator rotor with the alignment
mark “b” on the crankcase cover.
TIP
Check that the alignment marks “c” on the cam-
shaft sprockets are aligned with the edge of the
camshaft cap surfaces “d”.
3. Remove:
• Timing chain tensioner cap bolt “1”
• Timing chain tensioner “2”
• Gasket
4. Remove:
• Bolt (camshaft cap) “1”
• Camshaft cap “2”
• Clip “3”
TIP
• Remove the bolts (camshaft cap) in a criss-
cross pattern, working from the outside in.
• In order to prevent the clip from falling into the
crankcase, remove the camshaft cap.
NOTICE
ECA24610
The bolts (camshaft cap) must be removed
evenly to prevent damage to the cylinder
head, camshafts or camshaft caps.
5. Remove:
• Exhaust camshaft “1”
• Intake camshaft “2”
TIP
Attach a wire “3” to the timing chain to prevent it
from falling into the crankcase.
1
2
b
a
d
d
d
c
d
d
c
2
2
2
1
1
2
2
2
1
1
3