Valve Clearance; Cylinder Head Cover Removal - Honda CRF250X Owner's Manual & Competition Handbook

250X_060-083.qxd 08.7.3 10:11 ページ66

Valve Clearance

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 (page 27).
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.
66
Servicing Your Honda

Cylinder Head Cover Removal

Before inspection, clean the engine thoroughly to
keep dirt from entering the engine.
1. Remove the seat (page 35).
2. Remove the fuel tank (page 36).
3. Disconnect the breather tube (1) and direct
ignition coil (2).
(2)
(1)
(1) breather tube (2) direct ignition coil
4. Remove the cylinder head cover bolts/rubber
seals (3), and cylinder head cover (4).
(4)
(3)
(3) cylinder head cover bolts/rubber seals
(4) cylinder head cover
Positioning At Top Dead Centre On The
Compression Stroke
1. Remove the crankshaft hole cap (1).
(1)
(1) crankshaft hole cap
2. Remove the spark plug (page 61).