Suzuki drz 400 2000 - Page 69

3-28 ENGINE
TOP NARROWING CUT
• If
the contact area is too high on the valve, or if it is too wide,
use the
30° cutter (for the intake side) and the 15° cu tt er (for
th e exhaust side) to lower and narrow the contact area.
FINAL SEAT CUT
• If t he contact ar ea is t oo low or too narrow, use the 60 ' cutter
to
ra i se and widen the contact ar ea. If the contact area is too
high Or l ou vviu", US" li,,, 15" cuner to lower and narrow It to
the correct width.
• After the desi red seat position an d width is ac hi eve d, u se t he
60 ° cutter very lightly to clean up any burrs caused by th e
previous
cu tt ing operations.
[A CAUTION I
DO NOT use a lapping compound after the final cut is
made. The finished valve seat shoulc:l hAw. " velvety
smooth finish but not a highly polished or shiny one ,
This will provide a soft surface for the final seating of
the valve which will occur during the first few seconds
of engine operation,
NOTE:
Aft er servicing the valve seats, be sure to check the tappet clear-
ance after the cylinder head has been instal/ed. (c:7' 2-5 to 2-8)
Contact area too high and
too
wide on face of valve
Contact area too low and
too narrow on face of
valve
\
30 '
15°
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