Checking The Valve Seats - Yamaha FZ09E Service Manual

Valve guide remover (04.5)
90890-04116
Valve guide remover (4.5 mm)
YM-0411 6
Valve guide installer (04.5)
90890-04117
Valve guide installer (4.5 mm)
YM-04117
Valve guide reamer (04.5)
90890-0411 8
Valve guide reamer (4.5 mm)
YM-0411 8
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3. Eliminate:
• Carbon deposits
(from the valve face and valve seat)
4. Check:
• Valve face
Pitting/wear
4
Grind the valve face.
• Valve stem end
Mushroom shape or diameter larger than the
body of the valve stem
4
Replace the valve.
5. Measure:
• Valve stem runout
Out of specification
4
Replace the valve.
TIP ~~~~~~~~~~~~~~-
• When installing a new valve, always replace
the valve guide.
• If the valve is removed or replaced, always re-
place the valve stem seal.
EA~XO
Valve stem runout
0.01 O mm (0.0004 in)
CHECKING THE VALVE SEATS
/ /
The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
• Carbon deposits
(from the valve face and valve seat)
VALVES AND VALVE SPRINGS
2. Check:
• Valve seat
Pitting/wear
4
Replace the cylinder head.
3.
Measure:
• Valve seat width "a"
Ou1 of specification
4
Replace the cylinder
head.
Valve seat width
Valve seat width (intake)
0.90-1.10 mm (0.0354--0.0433 In)
Lim it
1.60 mm (0.06 in)
Valve seat widt h (exhaust)
1.10-1.30 mm (0.0433--0.0512 in)
Lim it
1.80 mm (0.07 In)
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
a. Apply blue layout fluid "b" onto the valve face.
b
b. Install the valve into the cylinder head.
c. Press the valve through the valve guide and
onto the valve seat to make a clear impres-
sion.
d . Measure the valve seat width.
TIP ~~~~~~~~~~~~~~-
Where the valve seat and valve face contacted
one another, the blue layout fluid will have been
removed.
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4. Lap:
• Valve face
5-25