Honda crf250r 2012 Owner's Manual page 78

4. Make sure the piston is at TDC on the
compression stroke (page 68).
Remove the camshaft holder bolts A (4), B (5)
and camshaft holders (6).
Loosen the camshaft holder bolts in a
crisscross pattern in two or three steps.
(4)
(6)
(5)
(4) camshaft holder bolts A
(5) camshaft holder bolts B
(6) camshaft holders
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 (7) and remove
the camshaft (8) and cam chain (9), then
attach a piece of wire to the cam chain to
prevent it from falling into the crankcase.
(6)
(9)
(7) left camshaft bearing
(8) camshaft
(9) cam chain
6. Remove the valve lifters (10).
Position the removed intake valve lifters and
shims to indicate their location such as intake or
exhaust, right or left.
NOTICE
Do not let the valve lifters or shims fall into the
crankcase.
(10) valve lifters
7. Remove the shims (11).
(8)
(7)
(11) shims
(10)
Valve Clearance
(11)
(11)
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Servicing Your Honda