Inspection Of The Seats Of The Valves - Yamaha FZ-16 Service Manual

2. Delete:
• Carbon deposits
(From the valve face and valve seat)
3. Check:
• Side valve
Pitting / wear face Grind
the valve.
• End of the valve stem
Mushroom or a larger diameter than the
Replace valve stem and the valve.
4. Measure:
• thickness of the valve margin D "a"
Out of specification Replace the valve.
Thickness of the valve margin
D (Admission)
From 0.50 to 0.90 mm
Thickness of the valve margin
D (Escape)
From 0.50 to 0.90 mm)
5. Measure:
• Deformation of the valve stem
Out of specification
valve.
NOTE:
• When installing a new valve, always
replace the valve guide.
• If the valve is removed or replaced
always replace the stem seal
the valve.
Deformation limit
Valve stem
0.010 mm
VALVES AND VALVE SPRINGS
Replace the
5-17
INSPECTION OF THE SEATS OF THE
VALVES
The following procedure applies to all
valves and valve seats.
1. Delete:
• Carbon deposits
(From the valve face and valve seat)
2. Check:
• Valve seat
Pitting / wear Replace the cylinder head.
3. Measure:
• width valve seat C "a"
Replace out of specification
stock.
Width of the valve seat
C(Admission)
0.90-1.10 mm
Width of the valve seat
C(Escape)
0.90-1.10 mm)
a.Instale the valve in the cylinder head.
b. Pressing the valve through the guide
valve and the valve seat to
a clear impression.
c. Measure the width of the valve seat.
NOTE:
When the valve seat and the face of the
valve have been in contact with each other, the
blue dye will have been eliminated.