Yamaha YZ450FP 2023, Owner'S Service Manual

Page: 208 / 388

CAMSHAFT
5-12
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:
•
Camshaft cap bolt “1”
• Camshaft cap “2”
TIP
Remove the camshaft cap bolts in a crisscross
pattern, working from the outside in.
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.
EAM30081
CHECKING THE CAMSHAFT
1. Check:
•
Camshaft lobe
Blue discoloration/pitting/scratches

Re-
1
2
b b b b b
a a a a a
d
c
d
c
1 1 1
2 2
1 1 1
2 2
2 2 2
1 1
3 3