Top End - Inspection; Tapper Clearance Adjustment; Camshaft Wear - Suzuki GS850G Service Manual

ENGINE
Release the knob and
sIowly turn
back the
crankshaft in normal running direction (to
slacken that portion of the chain extending
along the tensioncr). See if the knob rotates
by itself
3 s
the chain becon~es progressively
slackened: ii i t does. then the pushrod
inside is
olrviously moving fornard under
spring force
as it
should. thus signifying
that the tensioner is in good operable
condition. l l the knob
rotates. b u l
sluggishly. i t
means that the pushrod or
lock shaft is sticking
and. in
such a case,
remove tlrc tcnsiones and service the
pushrod a n d
lock shaft
to
make them move
smoolhlv. (See
pace 7-25).
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~ l r r i i
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TAPPET CLEARANCE ADJUSTMENT
I
After checking tensioning action. check all
valves for tappet clearance and. as
necessary,
ad,just
the clearance to the
speci fica ton outlined on page 3-6.
TOP END-
INSPECTION
One camshaft is provided for the intake
valves
and the other for the
exhaust
valves. Be sure to
discriminate between the
two.
The camshafts
shoz~ld be checked for n ~ n o u t and
also
for
the wear of cams and journals if the engine
has been noted as giving
abnormal noise or
vibration or to lack power output.
Any
of these
conditions may
be caused by camshafts
worn down or distorted to the service limit.
lnlel opcn
T.D.C
Fxhau~t
clmed
(H.T
n
c.r
I n l e ~ clored
'
(A.R.D.C-.b Exhaust own
IH
H.I) C.I
R DC.
Fig. 7-65
CAMSHAFT
WEAR
Worn-down
cams can
be the
cause
of
in-
correct valve timing resulting in reduced
power output. The limit of
cam
wear is
specified for both intake a n d exharrst cams
in terms of
cam
height
.
which
is
20
be
measured with a micrometer. Replace
carnstlafts if found worn down
to
the limit.