Valve Spring; Cylinder Head Flatness - Suzuki GS-1000 Service Manual

ENGINE
a
If: by
any
chance.
too
much stock has been
removed
from the seat during the refacing
work resulting in loss of the specified
tappet
clearance
even
with the thinnest
shim disc,
then
the only remedy is to
grind off
the stem
end
face
of the
valve
with a valve refacer,
thereby shortening the overall
length
of
the
valve.
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IMPOR TA NT:
a
This remedy
is
permissible where the
Iengrh
wit!
nor
be reduced ro less rhan
4.0 mm. I $ this
lengrh becomes sJtoner
than 4.0 mm,
(hen the
VQSLF
must be
rep/aced
m
Afier inslalling the tqolre
~.r.hose
sfem end
has been grotrrrd
o x as
above, check rhnr
rhe face
2
oJ
valt*e
srem end
is above the
colier pin
3 .
I
Fig. 7-76.
Free
length
specification
35.3
-
37.0 m m
43.00
-
45.25 mm
,
4 1.3 m m
OUTER
(1.692
-
1.702
in.)
1
(1.63 i n . )
Spring tension specification
(64.59
--
74.96
Ib/0.9 I in.)
OUTER
( r l l . 1 1
--
128.53lb/I.O6in.)
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IMPOR TA .VT:
Replace all o f
the
valve springs
a n a time, f
an! orte o J l h e s ~ is found
lo
be
less
than the
limit.
.
Fig. 7-75.
Valve spring
me
force of
the
two
coil
springs keeps the
valve
seats
tight.
Weakened springs result in
reduced engine
power
output, and often ac-
count for the chattering noise coming from
the valve mechanism.
Check the springs for strength by measuring
their free lengths and also the force required
to compress them. If the limit indicated
below
is
exceeded
by the free length reading
or if the
measured force d o a
not
fall within
the range specified, replace with
a
SUZUKI
spring.
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.
NOTE:
Replace
rwo
springs nr a time, ouler and in-
ner,
[f
ajzv
one o f rhese
is
found
lo
be beyond
!he Iimir.
Cylinder head flatness
m
Decarbonize
the
combustion chambers.
e
Check the gasketed
surface
of
the cylinder
head for flatness
with a
straightedge
and
thickness
gauge,
taking a clearance reading at
several places indicated. If the largest
reading at any
position
of the straightedge
ex-
ceeds the limit,
replace the cylinder
head.
Cylinder head warpage specification
0 . 0 3 m m 0.2 mrn