Valve Seat Servicing - Suzuki GS-1000 Service Manual

The ring-like red
lead impression left on the
valve
face must
be continuous
- without
any break - and, in addition to this
require-
ment, the width of the red-lead
ring, which is
the visualized seat "width". must be
within
the
following limit:
Valve seat width specificatian
I f either requirement is not met, correct the
F ~ R .
7 - 73,
Sear wtdth
@
seat
by serviving it
as
follows:
. - - - - ? . Y
-
+
-- --
-
NOTE:
This
is
a
ddicare machining operation, and
mltsr be carried our cauriously, bearing irr
Srandard
I.!
-
1.3
rnm
(0.04
-
0.05 i n . )
tnind
r
har rhere
is a
danger shot
the
valve will
Wear
limit
1.6 mm
(0.06 in.)
be raised
qf so
much toward
the cnmshqfr
rho)
rke rapper cIearance will become
unadjusrable even wirh !he thitinesr shim
Jrned ro [he lapper.
a
Lap the seat with
two
or three
sizes
of lap-
Fig. 7-71.
ping
compound. Use the coarse compound
to
product contacting width by operating the
Valve seat
servicing
valve
lapper in the usual manner. Finish the
The valve
seats
for both intake
and exhaust
seat, width with the fine compound.
valves
are angled to present three bevels,
15"
(inner). 45"
(middle) and 75" (outer). To
reface
the seat.
proceed
as
follows:
Fir. 7-72,
Make
cuts
at
15' and 75' first, removing
a
minimum of stock
at
each.
Make
a cut
at
45
*,
producing a width
of 1.1
-
1.3
m m
(0.04
-
0.05 in.). The amount of
stock
removed in this cutting directly
affects
the valve
position in regard to tappet
clearance.
Fig. 7-74.
Clean the
seat
after lapping. Check the seat
width with
the valve in the
manner
outlined
above, with the red-lead paste applied un-
iformly
on
the
seat.
-
.-
-
. .
-
-
.
-
.
--
-.
IW TE:
A)er senqicing the ~ w b e sears. be sure ro
adjusr
r he
tappet clenrancc after he cylittder
head has been reinstalled.