Honda 2009 CRF450X Owner's Manual & Competition Handbook page 74

Valve Clearance
Camshaft Holder Assembly Removal
1. Record the intake valve and exhaust valve
clearances.
Make sure the piston is at TDC (Top Dead
Centre) on the compression stroke (page 66).
2. Remove the cam chain tensioner lifter cover
bolt (1) and sealing washer (2).
(1)
(2)
(1) cam chain tensioner lifter cover bolt
(2) sealing washer
Use the tensioner stopper tool.
• Tensioner stopper 070MG-0010100
3. Turn the tensioner shaft clockwise with the
tensioner stopper (3) until it stops, in order to
retract the tensioner fully.
Then insert the tensioner stopper fully to hold
the stopper in the fully retracted position.
(3)
(3) tensioner stopper
68
Servicing Your Honda
HONDA O/M CRF450X (Eu) 3RMEY620 00X3R-MEY-6200
4. Loosen the cam sprocket bolt (4).
Rotate the primary drive gear bolt (crankshaft)
clockwise one turn and remove the other
sprocket bolt. Rotate the primary drive gear
bolt (crankshaft) clockwise one turn again and
remove the remaining sprocket bolt.
5. Remove the cam sprocket (5) and then attach
a piece of wire to the cam chain (6) to prevent
it from falling into the crankcase.
NOTICE
Do not let the bolts, sprocket and cam chain fall
into the crankcase.
(6)
(5)
(4)
(4) cam sprocket bolts
(5) cam sprocket
(6) cam chain