Suzuki DL650 Service Manual page 96

ENGI N E
3-45
INITIAL SEAT CUT
Using the 45
"
cutter, descale and clean up the seat. Rotate
the cutter one or two turns.
Measure the valve seat width
@
after every cut.
NOTE:
Cut only the minimum amount necessary from the seat to pre-
vent the possibility of the valve stem becoming too close to the
cams haft.
If the valve seat is pitted or burned, use the 45
"
cutter to con-
dition the seat some more.
TOP NARROWING CUT
If the contact area
@
is too high on the valve, or if it is too
wide, use the 15
"
(for the exhaust side
0)
and the 30
"
(for
the intake side @) to lower and narrow the contact area.
NOTE:
Contact area too hight and too wide on face of valve.
BOlTOM NARROWING CUT
If the contact area @ I
is too wide or too low, use the 60
"
cutter
to narrow and raise the contact area.