Valve Clearance; Cylinder Head Cover Removal; Positioning On Compression Stroke - Honda CRF250R Owner's Manual

Valve Clearance

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 valve clearance will change as engine
temperature rises.
56
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 fuel tank (pages 29,30).
2. Disconnect the breather tube (1) and direct
ignition coil (2).
(1)
(1) breather tube (2) direct ignition coil
3. Remove the cylinder head cover bolts (3) and
cylinder head cover (4).
(4)
(3) cylinder head cover bolts
(4) cylinder head cover
4. Remove the spark plug hole packing.
Positioning At Top Dead Center On The
Compression Stroke
1. Remove the crankshaft hole cap (1).
(2)
(1) crankshaft hole cap
2. Remove the spark plug (page 55).
(3)
(1)