Dinli DL-702 2008, Service Manual

Page: 138 / 306

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6-28
】
ENGINE
Initial Seat Cut
● Using the 45
○
cutter, descale and clean up the seat with one or two
turns
● Inspection the seat (see Valve Seat Width). If the seat is pitted or
burned, additional seat conditioning with the 45
○
cutter is required.
NOTE
45
○
Cut only the minimum amount necessary from the seat to
prevent the possibility of the tappet shim replacement.
●
If the contact area is too high on the valve, or if it is too wide, use
the 30
○
/60
○
cutters to lower and narrow the contact area.
● If the contact area is too wide or too low, use the 75
○
cutter to
narrow and raise the contact area.
● If the contact area is too low or too narrow, use the 45
○
cutter to
raise and widen the contact area.
W
30
○
W
75
○
NOTE
W
After cutting the 30
○
and 75
○
angles, it is possible that the valve
seat (45
○
) is less than the correct width.