Honda CRF250X 2006 Owner's Manual & Competition Handbook page 76

Valve Clearance
6. Insert the feeler gauge between the intake
valve lifter and cam lobe.
If the feeler gauge (13) cannot be inserted, the
shim is caught between the valve lifter and the
valve retainer. Remove the camshaft holders
to place the shim correctly, and reinstall the
camshaft holders.
VALVE CLEARANCES:
IN: 0.005 ± 0.001 in (0.12 ± 0.03 mm)
EX:0.011 ± 0.001 in (0.28 ± 0.03 mm)
(13)
(13)
(13) feeler gauge
72
Servicing Your Honda
7. Remove the stopper tool (14) from the cam
chain tensioner lifter.
(14) stopper tool
8. Install a new sealing washer (15) and cam
chain tensioner lifter cover bolt (16).
(14)
(15) sealing washer
(16) cam chain tensioner lifter caver bolt
(16)
(15)