Honda CRF450R 2009 Owner's Manual & Competition Handbook page 73

4. Make sure the piston is at TDC on the
compression stroke (page 64).
Loosen the camshaft holder bolts (6) in a
crisscross pattern in two or three steps.
Remove the camshaft holder bolts, set rings
(7) and camshaft holder (8).
As you remove the camshaft holder, set rings
may be sticking in the camshaft holder.
(7)
(6)
(8)
(6) camshaft holder bolts
(7) set rings
(8) 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.
5. Slide the left camshaft bearing (9) and remove
the camshaft (10) and cam chain (11).
(10)
(9)
(11)
(9) left camshaft bearing
(10) camshaft
(11) cam chain
6. Remove the intake valve lifters (12).
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.
(12)
(12) intake valve lifters
Valve Clearance
7. Remove the valve shims (13).
(13)
(13) valve shims
Servicing Your Honda
(13)
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