Yamaha YZF-R7 Owner's Service Manual page 159

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VALVES AND VALVE SPRINGS
a. Apply Mechanic's
(Dykem) b onto the valve face.
b. Install the valve into the cylinder
head.
c. Press the valve through the valve
guide and onto the valve seat to make
a clear impression.
d. Measure the valve seat width.
NOTE:
Where the valve seat and valve face con-
tacted one another, the blueing will have
been removed.
4. Lap:
• valve face
• valve seat
NOTE:
After replacing the cylinder head or
replacing the valve and valve guide, the
valve seat and valve face should be
lapped.
a. Apply a coarse lapping compound a
to the valve face.
CAUTION:
ACHTUNG:
Do not let the lapping compound enter
the gap between the valve stem and the
valve guide.
b. Apply molybdenum disulfide oil onto
the valve stem.
c. Install the valve into the cylinder
head.
d. Turn the valve until the valve face and
valve seat are evenly polished, then
clean off all of the lapping compound.
NOTE:
For the best lapping results, lightly tap
the valve seat while rotating the valve
back and forth between your hands.
4 - 27
ENG
blueing dye