Suzuki SFV650, Service Manual

Page: 240 / 573

1D-51 Engine Mechanical:
NOTE
If valve guides have to be removed for
replacement after inspecting related parts,
carry out the steps shown in valve guide
replacement. Refer to “Valve Guide
Replacement (Page 1D-52)”.
Valve Seat Width
1) Visually check for valve seat width on each valve
face. If the valve face has worn abnormally, replace
the valve.
2) Coat the valve seat with a red lead (Prussian Blue)
and set the valve in place.
3) Rotate the valve with light pressure.
Special tool
(A): 09916–10911 (Valve lapper set)
4) Check that the transferred red lead (Blue) on the
valve face is uniform all around and in center of the
valve face.
If the seat width “a” measured exceeds the standard
value, or seat width is not uniform reface the seat
using the seat cutter. Refer to “Valve Seat Repair
(Page 1D-53)”.
Valve seat width “a” (IN. & EX.)
Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)
Valve Seat Sealing Condition
1) Clean and assemble the cylinder head and valve
components.
2) 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. Refer to “Valve Seat
Repair (Page 1D-53)”.
WARNING
!
Always use extreme caution when handling
gasoline.
NOTE
After servicing the valve seats, be sure to
check the valve clearance after the cylinder
head has been reinstalled. Refer to “Valve
Clearance Inspection and Adjustment in
Section 0B (Page 0B-4)”.
(A)
I718H1140122-01
(A)
I944H1140238-01
“a”
I649G1140246-02
I944H1140239-02