Honda 2005 CRF450R Owner's Manual page 67

Valve Clearance
11.Check the operation of the plunger (3) by
pushing the decompressor weight (20) with
your finger and then pushing the plunger
down. Release the decompressor weight and
pull up the plunger.
(20)
(3)
(3) plunger
(20) decompressor weight
12.Remove the stopper tool (26) from the cam
chain tensioner lifter.
(26) stopper tool
62
Servicing Your Honda
13.Rotate the primary drive gear bolt (crankshaft)
clockwise two turns and align the punch mark
(13) with the index mark (14). Make sure that
the timing mark (17) on the sprocket align
with the "∆" mark (18) on the camshaft holder
assembly.
If the timing mark doesn't align with the "∆"
mark, remove the cam sprocket.
Then realign the valve timing.
(13)
(14)
(13) punch mark
(14) index mark
(17) timing mark
(18) "∆" mark
(26)
14.Measure the intake valve and exhaust valve
clearances.
Valve Clearance:
IN:0.006 ± 0.001 in (0.16 ± 0.03 mm)
EX:
(17)
(27) feeler gauge
15.Install a new sealing washer (28) and tighten
(18)
the cam chain tensioner lifter cover bolt (29).
(28) sealing washer
(29) cam chain tensioner lifter cover bolt
0.011 ± 0.001 in (0.28 ± 0.03 mm)
(27)
(27)
(29)
(28)