Valve Clearance - Honda CRF250R Owner's Manual

Valve Clearance

Valve Clearance

Refer to Important Safety Precautions on page 23.
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 valve clearance
when the engine is cold at the intervals specified in
the Maintenance Schedule (page 25).
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.
68
Servicing Your Honda
Cylinder Head Cover Removal
Before inspection, clean the engine thoroughly to
keep dirt from entering the engine.
1. Remove the seat and hang the fuel tank to the
left of the frame (pages 34, 35).
2. Disconnect the breather tube (1) and spark
plug cap (2).
(2)
(1) breather tube (2) spark plug cap
3. Remove the cylinder head cover bolts, rubber
seals (3) and cylinder head cover (4).
(4)
(3)
(3) cylinder head cover bolts and rubber seals
(4) cylinder head cover
Positioning At TDC On The
Compression Stroke
1. Remove the crankshaft hole cap (1).
(1)
(1) crankshaft hole cap
2. Remove the spark plug (page 67).
3. Remove the cylinder head cover (this page).
(1)