Yamaha FZ6-ST Supplementary Service Manual page 279

VALVES AND VALVE SPRINGS
2. Replace:
S valve guide
NOTE:
To ease valve guide removal and installation,
and to maintain the correct fit, heat the cylinder
head to 100_C (212_F) in an oven.
a. Remove the valve guide with the valve guide
remover 1 .
b. Install the new valve guide with the valve
guide installer 2 and valve guide remover
1 .
c. After installing the valve guide, bore the
valve guide with the valve guide reamer 3 to
obtain the proper valve-stem-to-valve-guide
clearance.
NOTE:
After replacing the valve guide, reface the valve
seat.
3. Eliminate:
S carbon deposits
(from the valve face and valve seat)
4. Check:
S valve face
Pitting/wear ! Grind the valve face.
S valve stem end
Mushroom shape or diameter larger than the
body of the valve stem ! Replace the valve.
5-26
ENG
Valve guide remover
(4 mm, 0.16 in)
90890-04111,
Valve guide installer
(4 mm, 0.16 in)
90890-04112,
Valve guide reamer (4 mm, 0.16 in)
90890-04113, YM-04113