Yamaha YZ450FA 2011 Owner's Service Manual page 125

REMOVING THE CAMSHAFT
1. Remove:
• Timing mark accessing screw "1"
• Crankshaft end accessing screw "2"
2. Align:
• Alignmen mark
Checking steps:
a. Turn the crankshaft counterclockwise with a
wrench.
b. Align the alignment mark "a" on the rotor
with the alignment mark "b" on the crank-
case cover.
IMake sure that the alignment mark "c" on the
exhaust camshaft sprocket and the alignment
mark "d" on the intake camshaft sprocket are
aligned with the edge of the cylinder head.
3. Remove:
• Timing chain tensioner cap bolt "1"
• Timing chain tensioner "2"
• Gasket
4. Remove:
• Bolt (camshaft cap) "1"
• Camshaft cap "2"
• Clip
Remove the bolts (camshaft cap) in a criss-
cross pattern, working from the outside in.
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"
Attach a wire "3" to the timing chain to prevent
it from falling into the crankcase.
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CAMSHAFTS