Cylinder Head Cover Removal; Positioning On Compression Stroke; Valve Clearance - Honda CRF450X Owner's Manual

Refer to Safety Precautions on page 25.
Excessive valve clearance will cause noise and
eventual engine damage. Little or no clearance
will prevent the valve from closing and cause
valve damage and power loss. Check the valve
clearance when the engine is cold at the intervals
specified in the Maintenance Schedule (pages 27,
28).
The checking or adjusting of the valve clearance
should be performed while the engine is cold.
The valve clearance will change as engine
temperature rises.

Cylinder Head Cover Removal

Before inspection, clean the engine thoroughly to
keep dirt from entering the engine.
1. Remove the seat (page 36).
2. Remove the fuel tank (page 37).
3. Disconnect the breather tube (1) and spark
plug cap (2).
(2)
(1)
(1) breather tube (2) spark plug cap
4. Remove the cylinder head cover A bolt (3),
cylinder head cover B bolts (4) and cylinder
head cover (5).
(4)
(5)
(3)
(3) cylinder head cover A bolt
(4) cylinder head cover B bolts
(5) cylinder head cover

Valve Clearance

5. Remove the plug hole packing and cylinder
head cover packing.
Positioning At Top Dead Centre On The
Compression Stroke
1. Remove the crankshaft hole cap (1).
(1)
(1) crankshaft hole cap
(cont'd)
Servicing Your Honda
67