Suzuki GS850G Service Manual page 76

Fig. 7-79
1. F~iscrt with n
qlieht rotation. the solid pilot
Ihnt give5 a snug
fil.
The shoulcler
on t h e
pilot sho~ilcl be about 10
mrn (0.39 in)
From
the valve guide.
2. Usit~g the 4S0 cutter No. 635. dcscale and
cleatlup the
sent
tf
it11 one
or 1wo
turns.
3.
Inspect thc
seAt
by thc previous seat npidth
measurement
procedure. I f
t h e
seal
is
B
pitted or burned. additional seal con-
ditioning
w i t h
the 45' cutter is required.
NOTE:
C~rt
I ~ P
~ ) r i ~ ~ i ? ? ~ r ~ m ~ t n o r ( r t t
~ ~ P C T S S U ?
.fion~
11113
s p a t
to
J T ~ P I ' P I ~ ~
f
/IY
pr)s.sihilitv
qf
I I I P
1 ~ 1 1 * 0
S r P n r
hpcorniri~ too C I U S ~ ~
I ~ P
ruppcr f b r correct 11all-e contarr
at?g/e.
F i y .
7-80
I I thc cont:ict
urea is loo low. use 3 5 '
cuttcr
No. 2
1 0 to
mise ;ind narrow
thc
conrnct
nren.
B
If
t h e
co1itnc.t :Ire:[ is
too hiyh. use
15" cutter
N o . h35 to lon'cr and nxrron. the con
tact nrcn.
Aftcr
cutting
thc 75'
nncl
l 5 O nngles.
i t i s
pc.rssi2,lc
th:1l
tlie vn1t.e scat (45") is too narrow.
ENGINE
I f
so.
re-cut the seat
to
the correct width.
4. After the desired
war position and width
i5
achieved.
use the 45' cuttcr
very
lightly to
clean
irp any hurrs
cauqecl by the previous
cutling operations.
DO NOT
use
Inpping
compound after
the
final
cut
is
made.
The
finished valve
seat
shotlld have a
velvcly
snlooth finis11 and not
a
highly polished or
shiny Finish. This will provide a soft sz~rface
for the final seating o f the valve which will
occur during the first few seconds of engine
opera tion.
5. Clean and assemble the head and valve
components. Fill the intake and exhaust
ports with gasoline to check
For
leaks. If any
leaks occur. inspect the
valve
seat and face
for hurrs or other things that could prevent
t h e valve
from sealing.
NOTE:
A/tvu-vL~ rrse
p x l r p r n e
crrurion
when
handling gusofi~re.
NOTE:
After servicing r l r ~
valve
spats.
he
sure
to
adjltsr
the tappet c f e a r a n c ~ after
l f r p
c-ylinder head has been r~i~zstalled.
6, I f , by any chance, too much stock has heen
removed from the
sent
during the refacing
work resulting in
loss
of the specified lappet
clearance even
with
the thinnest
shim d i ~ c .
then the only remedy is lo grind off the stem
end face o f the valve with a valve refacer,
thereby shortening the overall length of
the
valve.
I M P 0 R TA NT:
This reme+ is p ~ n ~ l i s s i h l ~
whrrr
the
Iength
(7)
will not Ar rr~dtlcrcl
rn
Iess
t
hart 4.0
m ~ t .
Jf
t11i.q I~n~Crt/t
h(~rome,r
sJtorres
fr'lcrt~
4.0 rnm (0. l h
irlJ. ~ ~ I P I I
rlre vuh~r
rnldst
he
rr;r~lr~crd.
*
Aftpr
irrslallil~g
I
he
~tuhle whosr
stern
w d
hns J ~ ~ P P I grotrnd
off
as ahovt.,
r h ~ c k that t h ~
fat-(>
@ of v r r h * ~
s r P r n
~ j t d is ahnvr tlw c o t l ~ r pirt
3 1 .