Suzuki Boulevard M50, Service Manual

Page: 82 / 454

3-36 ENGINE
BOTTOM NARROWING CUT
• If the contact area
W
is too wide or too low, use the 60°
(intake side only) to narrow and raise the contact area.
FINAL SEAT CUT
• If the contact area
W
is too low or too narrow, use the 45° cut-
ter to raise and widen the contact area.
NOTE:
After cutting the 15°, 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.
• 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.

NOTE:
After servicing the valve seats, be sure to check the valve clear-
ance after the cylinder head has been reinstalled. (

2-7)
60˚
(Intake only)
Contact area too low and
too narrow on face of valve
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.
SA
MP
LE