Checking The Valve Seats - Yamaha FZS1000N Service Manual

VALVES AND VALVE SPRINGS
3. Eliminate:
R carbon deposits
(from the valve face and valve seat)
4. Check:
R valve face
Pitting/wear ! Grind the valve face.
R valve stem end
Mushroom shape or diameter larger than the
body of the valve stem ! Replace the valve.
5. Measure:
R valve margin thickness a
Out of specification ! Replace the valve.
6. Measure:
R valve stem runout
Out of specification ! Replace the valve.
NOTE:
R When installing a new valve, always replace
the valve guide.
R If the valve is removed or replaced, always re-
place the oil seal.
EAS00240

CHECKING THE VALVE SEATS

The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
R carbon deposits
(from the valve face and valve seat)
2. Check:
R valve seat
Pitting/wear ! Replace the cylinder head.
3. Measure:
R valve seat width a
Out of specification ! Replace the cylinder
head.
5-24
ENG
Valve margin thickness
0.5 X 0.9 mm (0.020 X 0.035 in)
Valve stem runout
0.01 mm (0.0004 in)
Valve seat width
Intake: 0.9 X 1.1 mm
(0.035 X 0.043 in)
Exhaust: 0.9 X 1.1 mm
(0.035 X 0.043 in)