Suzuki DL650 Service Manual page 97

3-46 ENGINE
FINAL SEAT CUT
If the contact area
@ I
is too low or too narrow, use the 45
"
cutter to raise and widen the contact area.
NOTE:
*
After cutting the 15
O,
30
"
and 60
"
angles, it is possible that
the valve seat (45 " ) is too narrow. If so, re-cut the valve seat
to the correct width.
*
Contact area too low and too narrow on face of valve.
After the desired seat position and width is achieved, use the
45
"
cutter very lightly to clean up any burrs caused by the
previous cutting operations.
CAUTlONI
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 finish. This
will provide a soft surface for the final seating of the
I
valve which will occur during the first few seconds of
I
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.
(-2-8)