Checking The Valve Seats - Yamaha XJR1300 2007 Service Manual

1
c. After installing the valve guide, bore the valve
guide with the valve guide reamer "3" to ob-
tain the proper valve-stem-to-valve-guide
clearance.
NOTE:
After replacing the valve guide, reface the valve
seat.
Valve guide remover & installer
set (ø5.5)
90890-04016
Valve guide remover (5.5 mm)
YM-01122
Valve guide remover & installer
set (ø5.5)
90890-04016
Valve guide installer (5.5 mm)
YM-04015
Valve guide remover & installer
set (ø5.5)
90890-04016
Valve guide rearmer (5.5 mm)
YM-01196
LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
3. Eliminate:
Carbon deposits
G
(from the valve face and valve seat)
4. Check:
Valve face
G
Pitting/wear → Grind the valve face.
2
3
VALVES AND VALVE SPRINGS
Valve stem end
G
Mushroom shape or diameter larger than the
body of the valve stem → Replace the valve.
5. Measure:
Valve margin thickness "a"
G
Out of specification → Replace the valve.
Valve margin thickness "a"
0.8 mm–1.2 mm
(0.0315–0.0472 in)
6. Measure:
Valve stem runout
G
Out of specification → Replace the valve.
NOTE:
When installing a new valve, always replace
G
the valve guide.
If the valve is removed or replaced, always re-
G
place the oil seal.
valve stem runout
Valve stem runout
0.010 mm (0.0004 in)
EAS24300

CHECKING THE VALVE SEATS

The following procedure applies to all of the
valves and valve seats.
1. Clean: Eliminate:
Carbon deposits
G
(from the valve face and valve seat)
5-19
a