Honda CRF450R Owner's Manual page 77

Valve Clearance
5. Make sure the piston is at TDC on the
compression stroke (page 67).
Loosen the camshaft holder bolts (7) in a
crisscross pattern in two or three steps.
Remove the camshaft holder bolts, set rings (8)
and camshaft holder (9).
As you remove the camshaft holder, set rings may
be sticking in the camshaft holder.
(8)
(9)
(7)
(7) camshaft holder bolts
(8) set rings
(9) camshaft holder
NOTICE
Do not let the set rings fall into the crankcase.
If the set rings are remained on the camshaft
holder, remove the set rings carefully.
70
Servicing Your Honda
6. Slide the left camshaft bearing (10) and
remove the camshaft (11) by removing the cam
chain (12).
NOTICE
Do not let the cam chain fall into the crankcase.
(11)
(12)
(10)
(10) left camshaft bearing
(11) camshaft
(12) cam chain
7. Remove the intake valve lifters (13).
Keep the intake valve lifters and shims separate so
you can easily identify the originally installed
location such as intake or exhaust, right or left.
(13)
(13) intake valve lifters
8. Remove the valve shims (14).
(14)
(14)
(14) valve shims