Suzuki DL1000 Service Manual page 89

If the contact area is too high on the valve, or if it is too wide, use
the 15°/60° cutters (for exhaust side) and 30°/60° cutters (for
intake side) to lower and narrow the contact area.
If the contact area is too low or too narrow, use the 45° cutter to
raise and widen the contact area.
• After the desired seat position and width is achieved, use the
45° cutter very lightly to clean up any burrs caused by the pre-
vious cutting operations.
#
DO NOT use lapping compound after the final cut is
made. The finished valve seat should have a velvety
smooth finish and not a highly polished or shiny fin-
ish.
This will provide a soft surface for the final seating of
the valve which will occur during the first few seconds
of engine operation.
• 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.
NOTE:
After servicing the valve seats, be sure to check the tappet
clearance after the cylinder head has been reinstalled. (!2-7)
Contact area too high and too
wide on face of valve
Contact area too low and too
narrow on face of valve
ENGINE 3-43