Suzuki VZR1800 2007 Service Manual page 94

VALVE SEAT WIDTH INSPECTION
• Visually check for valve seat width on each valve face.
• If the valve face has worn abnormally, replace the valve.
• Coat the valve seat with a red lead (Prussian Blue) and set
the valve in place. Rotate the valve with light pressure.
• Check that the transferred red lead (blue) on the valve face is
uniform all around and in center of the valve face.
% 09916-10911: Valve lapper set
• If the seat width W measured exceeds the standard value or
seat width is not uniform, reface the seat using the seat cutter.
$ Valve seat width W:
Standard: (IN.): 1.1 – 1.3 mm (0.043 – 0.051 in)
(EX.): 1.4 – 1.6 mm (0.055 – 0.063 in)
If the valve seat is out of specification, re-cut the seat.
VALVE SEAT SERVICING
• The valve seats 1 for both the intake valve 2 and exhaust
valve 3 are machined to three different angles. The seat con-
tact surface is cut at 45°.
Seat angle
Seat width
(0.043 – 0.051 in)
Valve diameter
6.000 – 6.012 mm
Valve guide I.D.
(0.2362 – 0.2377 in)
"
* 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.
NOTE:
After servicing the valve seats, be sure to check the valve clear-
ance after the cylinder head has been reinstalled. (!2-8)
INTAKE
15°, 45°, 60°
1.1 – 1.3 mm 1.4 – 1.6 mm
(0.055 – 0.063 in)
42 mm (1.65 in) 38 mm (1.50 in)
EXHAUST
←
←
˚ ˚
60 60
˚
15
˚
45
IN. EX.
ENGINE 3-37
˚
15
˚
45