Honda CRF450R 2017 Owner's Manual & Competition Handbook page 73

Valve Clearance
3. Insert the tensioner stopper (3) into the cam
chain tensioner lifter (4).
Turn the tensioner stopper clockwise and lock
the cam chain tensioner lifter by pushing the
handle (5) to the cam chain tensioner lifter.
• Tensioner stopper 07AMG-001A100
(5)
(4)
(3) tensioner stopper
(4) cam chain tensioner lifter
(5) handle
68
Servicing Your Honda
4. Check the piston is at TDC on the compression
stroke (page 66).
Loosen the camshaft holder bolts (6) in a
crisscross pattern in two or three steps.
Remove the camshaft holder bolts, camshaft
holder (7) and set rings (8).
As you remove the camshaft holder, set rings may
be sticking in the camshaft holder.
(3)
(6) camshaft holder bolts
(7) camshaft holder
(8) set rings
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.
(7)
(6)
(8)
5. Slide the left camshaft bearing (9) and remove
the camshaft (10) by removing the cam chain
(11).
Suspend the cam chain with a piece of wire to
prevent the chain from falling into the crankcase.
NOTICE
Do not let the cam chain fall into the crankcase.
(11) (10)
(9)
(9) left camshaft bearing
(10) camshaft
(11) cam chain