Suzuki GSX-R1000 2007 Service Manual page 88

3-38 ENGINE
• If the seat width
seat width is not uniform, reface the seat using the seat cutter.
Valve seat width
Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)
If the valve seat is out of specification, re-cut the seat.
VALVE SEAT SERVICING
• The valve seats  for both the intake valve  and exhaust
valve  are machined to five different angles. The seat con-
tact surface is cut at 45°.
Valve seat angles
Valve seat width
Valve diameter
Valve guide I.D.
* The valve seat contact area must be inspected after
each cut.
* Do not use lapping compound after the final cut is
made. The finished valve seat should have a velvety
smooth finish but not a highly polished or shiny fin-
ish. This will provide a soft surface for the final seat-
ing of the valve which will occur during the first few
seconds of engine operation.
* The titanium valves are coated with an oxidized
membrane treatment to resist wear but the mem-
brane tend to be removed if lapped after valve seat
servicing.
NOTE:
After servicing the valve seats, be sure to check the valve clear-
ance after the cylinder head has been reinstalled. (
• Clean and assemble the head and valve components. Fill the
intake and exhaust ports with gasoline to check for leaks.
• If any leaks occur, inspect the valve seat and face for burrs or
other things that could prevent the valve from sealing.
Always use extreme caution when handling gasoline.
measured exceeds the standard value or
:
IN
30°, 45°, 55°
0.9 – 1.1mm (0.035 – 0.043 in)
30 mm (1.18 in)
4.500 – 4.512 mm (0.177 – 0.178 in)
EX
15°, 45°, 60°
24 mm (0.94 in)
2-7)
˚
˚ 60
55
˚
30
45 ˚
IN
˚
15
45 ˚
EX