Honda 2010 CRF250R Service Manual page 203

Blowout all oil passages in the cylinder head with
compressed air.
Install the spring seat and new stem seal.
NOTE
Do not mterchange the mtake and exhaust stem seals.
- Intake stem seal: Brown
- Exhaust stem seal: Dark green
Lubncate the valve stem and stem end sliding surface
wIth molybdenum oil solution.
Insert the valves into the guide while turning It slowly to
avoid damage to the stem seal.
Install the valve springs with the tightly wound coils
facing the combustion chamber side.
Install the spring retamers.
NOTE
Do not confuse the intake spring retainers and exhaust
spnng retainers.
- Intake spring retainer: Two grooves
- Exhaust spring retainer: One groove
CYLINDER HEADN ALVES
SPRING SEAT
I
VALVE --:IQ
/ r
RETAINER
STEM SEAL
INTAKE STEM
SEAL:
VALVE
(Brown)
INTAKE VALVE
SPRING
I
INTAKE SPRING
RETAINER:
(Two grooves)
conERS
EXHAUST STEM
SEAL:
I
(Dark green)
EXHAUST
VALVE SPRING
EXHAUST SPRING
RETAINER'
(One groove)
Install the tappet hole protector into the valve lifter bore.
' T- A - P- P- E- T-H -O -L - E - P- R ~= O = T= E= C= T=O=R====---
TOOL:
Tappet hole protector
TOOL, U.S.A. only:
See instructions on page 8·19
07JMG· KY20100
not available in
U.S.A.
8-27