Honda CRF250R 2005, Owner'S Manual

Page: 59 / 164

Servicing Your Honda
55
Valve Clearance
Cylinder Head Cover Removal
Before inspection, clean the engine thoroughly to
keep dirt from entering the engine.
1. Remove the seat (page 29).
2. Remove the fuel tank (page 30).
3. Disconnect the breather tube (1) and spark
plug cap (2).
Positioning At Top Dead Center On The
Compression Stroke.
1. Remove the crankshaft hole cap (1).
(1) breather tube (2) spark plug cap
4. Remove the cylinder head cover bolts (3), and
cylinder head cover (4).
(3) cylinder head cover bolts
(4) cylinder head cover
(1) crankshaft hole cap
2. Remove the spark plug (2).
(2) spark plug
(2)
(1)
(4)
(3)
(1)
(2)
(cont’d)
Refer to Safety Precautions on page 19.
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.
The checking or adjusting of the clearance should
be performed while the engine is cold.
The clearance will change as engine temperature
rises.