Cylinder Head Inspection - Honda 2010 CRF250R Service Manual

CYLINDER HEADNALVES
Marl< all parts
Remove the following:
dunng disassembly
so
they can
be
ins/aI/ad in the"
origins/loca/lOns.
- Spring retainer
- Valve spring
- Valve
- Slem seat
- Spring seat
CYLINDER HEAD INSPECTION
CYLINDER HEAD
Disassemble the cylinder head (page 8-19).
Use
care nor
/0 Remove the carbon deposits from the combustion
scratch
the
chamber or exhaust port
combustion
Check the spark plug hole and valve area for cracks.
chamber or
head
gasket surface.
Replace the cylinder head if necessary.
SPRING SEAT
~/ ~ VALVE
/ .
~
RETAINER
STEM SEAL
VALVE SPR.ING
conERS
I
Ched< the cylinder head for warpage with a straight
;:=:~iE=~~~~IIIIIIIIIIIIIIIIIIIIIIIIIIIIII~::~l
edge and feeler gauge.
I
8-20
SERVICE LIMIT: 0.05 mm (0.002 i n)
Check the valve lifter bore for scoring, scratches or
~~=='::~~~~~~~~~":"'~~=~
damage.
Measure each valve lifter bore LD.
SERVICE LIMIT: 22 .54
mrn
(0 .887
in)