KAYO MOTOR AU200, Руководство по обслуживанию

Страница: 82 / 138

5
发动机
26
Milling the upper ring of the valve seat with
a 32
°
milling cutter
Milling the bottom ring of the valve seat
with a 60
°
milling cutter
Finish the valve seat's work surface with a
45
°
milling cutter to the correct width.
Working face width standard value
：
1.0mm
Apply ink to the valve seat and insert it into
the valve to rotate
Then take out the valve and see if the
contact surface is in good condition.
Note: The situation of contact surface
between the valve and the valve seat will
be a very important factor for the
engine's tightness
.
If the valve contact surface is too high, it can
be abolished with a 32
°
milling cutter to
reduce the contact surface
Flat trimming knife
Valve correction knife
Internal trimming knife
Width of old valve seat
Width of old valve seat