Honda CRF450R 2006, Owner'S Manual

Page: 61 / 172

Servicing Your Honda
57
Valve Clearance
Camshaft Holder Assembly Removal
1. Record the intake valve clearance, exhaust
valve clearance and decompressor arm
clearance.
Make sure the piston is at TDC (Top Dead
Center) on the compression stroke (page 55).
2. Remove the cam chain tensioner lifter cover
bolt (1) and sealing washer (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
stopper tool (3) until it stops, in order to
retract the tensioner fully.
Then insert the stopper tool fully to hold the
stopper in the fully retracted position.
(3) stopper tool
(1)
(2)
(3)
(3)
Measure the decompressor arm clearance by
inserting a feeler gauge (1) between the
decompressor arm adjusting screw (6) and right
side rocker arm (7).
(1) feeler gauge
(6) decompressor arm adjusting screw
(7) right side rocker arm
DECOMPRESSOR CLEARANCE:
RIGHT EXHAUST VALVE CLEARANCE
+
0.014 IN (0.35 mm)
Example:
If measured right exhaust valve clearance is
0.011 in (0.28 mm), decompressor clearance is;
0.011 in (0.28 mm) + 0.014 in (0.35 mm)
= 0.025 in (0.63 mm)
If only decompressor arm clearance needs
adjustment, see Decompressor Arm Clearance
Adjustment (page 63).
If intake valve clearance, exhaust valve
Clearance and decompressor arm clearance don’t
need adjustment, see Spark Plug Installation
(page 64).
(6)
(1)
(7)
(cont’d)