Yamaha XJR1300(L) 99, Service Manual

Page: 133 / 338

4-21
302-013
ENG
VALVES AND VALVE SPRINGS
NOTE:
NOTE:
a. Remove the valve guide with a valve guide
remover 1 .
b. Install the new valve guide with a valve guide
installer 2 and valve guide remover 1 .
c. After installing the valve guide, bore the
valve guide with a valve guide reamer 3 to
obtain the proper valve-stem to valve-guide
clearance.
After replacing the valve guide, reface the valve
seat.
Valve guide remover, reamer &
installer
(5.5 mm): 90890-04016
3. Eliminate:
carbon deposits
(from the valve face and valve seat)
4. Check:
valve face
Pitting/ wear
Grind the valve face.
valve stem end
Mushroom shape or diameter larger than the
body of the valve stem
Replace the valve.
5. Measure:
valve margin thickness
a
Out of specification Replace the valve.
Valve margin thickness
0.8 mm 1.2 mm
6. Measure:
valve stem runout
Out of specification
Replace the valve.
When installing a new valve, always replace
the valve guide.
If the valve is removed or replaced, always re-
place the oil seal.
Valve stem runout
0.01 mm