Checking The Valve Springs - Yamaha FZ-16 Service Manual

4.
Rectify:
•
Valve face
•
Valve seat
NOTE:
After replacing the cylinder head or replacing
the valve and valve guide must be
lapped the valve seat and the face of the
valve
a.
Apply lapping compound secondary
"A" to the face of the valve.
CAUTION
Do not let the lapping compound enter between
the valve stem and guide
valve.
b.
Apply molybdenum disulfide oil in
the valve stem.
c.
Install the valve in the cylinder head
d.
Turn the valve until the face of the
valve guide and valve seats
are uniformly bright, then
clean all the lapping compound.
NOTE:
For best lapping results, hit
Gently seat the valve while
turn the valve back and forth between your hands.
VALVES AND VALVE SPRINGS
e.
Apply a fine lapping compound to the face
valve and repeat the steps above.
f.
After every lapping procedure,
be sure to clean all of the mixture to
lapping the face of the valve seat
the valve.
g.
Install the valve in the cylinder head.
h.
Pressing the valve through the end of
the valve guide and seat of the
valve to make a clear impression.
i.
Measure the width of the valve seat "c"
again. If the width of the valve seat
is out of specification, and rectifíquelo
lapping again the valve seat.

CHECKING THE VALVE SPRINGS

The following procedure applies to all
valve springs.
1.
Measure:
•
Free length of the valve spring "a"
Out of specification Replace
valve spring.
5-18