Clutch And Front Chain Adjustment - BSA B31 Instruction Manual

,,,,
,.
I*ll:".Tqi"g.
rt u-a
rare
ffiilcc
ror-thc
masneto
' .j
:
prnron to
slacken
_98
gnd df{ilcb
the
igritiotr
seuins-
"ååd.d,ii,*",^gTm
l: ;:rmfl
,:"i
rr,.
.,'å"i?
It
is,
however, advisable
to
check over
the timing
after
c4rrymg out-any
adjustment
ro
the
magneto cåntact
polDls,
as-
a sttght variarion of
the
points
tends
to
advaDce
or
.retard
the trming.
(Opening
the points
advances
umtng,
ctostng
tåem
retards !imiDg.)
t/
-I.f
lhe timing
requires re-sefting,
first che.k that
fie
,,
ruuy-open
gap
at
ttre
poiD6
iq between .Ol0 in.
aDd .Ol2 in.
,
ln:l
re.gpÆ,ih9 rimins
q{er:
al,.d
in
S-doineTå[Eh
not.ro
dåyrlåEE
thesmall frdløe
ff
fie
riming
cover which
reeos
olt_to the hollow
crankshaft. It
is advisable
to leave
:T",,b*.S
sqews
in position (half
unscrewed aod
spaced
equa
y rouod
tle
cover) while
the cover
joint
is
brokeD.
With
the cove! r€moved, take
of
the nut locking
the
111ETt9
pinign
on
!!s-shaft,_aod
with
the aid of
a
maioeio
pln.lon
extractor withdraw
tbe
pinion.
(Note:_The Iatter
ts.altacned
-to
a.taprr€d
shafr and
can
only
be releascd
wfin
salety by
ustng the proper
extraqor.)
.
To reset the timing,
tum
the
eDgiae forward utrtil
the
pNlon
reaches
top
dead centle on
tlero/trpression
stroke.
Now turb
the engine bact until
the fi3(6f, ha. O".""na.J
ft in.
(BjJ,
. in.). This
operat
ion
is
siinptined ir
top
iåil!
engaged aDd
the rear wheel
tumed backward.. (poi
Cofa
Star models
see.page
53.) Turn
rhe
contacl bleaker
in
irs
du€ctton
of_t^otalion
until
the
points
are
just
open
(not
more rban
.00.2 io.),_wiri_ the ignition tevir in
ihe fu
y
advanc€d
-positiotr.
Lightly tap
rhe rnagneto
pinion
on
ro tls
snaltr
ltgh-ten t]le nut, and carefully
check
figures
and
posriions.
If
setring
is
correct,
finally tighre;
the
ma€nero
ptnlon
Dut.
t
t is
ftost impon4nt
that
the ignil
ion
scttlng is accurate. Too
much
or too
ti
le
advan;e will
rcsult in. highcr
running
temperaturcs
-a
auv *ua"
ptslon seizure.
(See also Magdyno
Fixing
page
tg.)
,/
('hrtch. Thc
mflin clurch
adjusrment is totally
enclosed'
l|t
thc
gcitrbox
r,Lrrcr cover,
and is exposed when the
6llcr
cnn rs r€nx)vc(|,
,
The
adjustitrg scrcw
4
Fig.
t
t,
is
locked in posirioo
by
tle nut,{..
For
Comp. and
swingi-o8 arm modils
see
Fig,
13,
/l
and C
respectively,
aod after
releasing
the latre;,
adJust the screw so that
there is
a
little
clearance between
the.
ball
atrd the clutch push rod,
Then
re-tiShten the
locknut
and replace the filler plug.
Fig.ll.
Clutch
and lront chain adjustmenl
Fu
her adjustment
is
prcvided
by the knurled
thumb
nut
C (-E oncorb_p. and Swinging
ArD),
on top of
the
g€arbol
KememDer, tlowever,
lbat
some free
movement
itr
the
control
arm is
necessary, as
if
rbe adjustmen(
is too
close
ruere
wl
be conslant
pressure on
the clutch, with
con_
sequrnl wear aqd
loss
ofefficiency, (For Cold Star
RaciDg
see
Handlebar
levers,
paSe
57.)
C'lutch Sprfug Pressure.
After a
considerable mileage it
may
be desirable
to
iacre€se tbe spring
pressurel
a
little.
Firsl
drain lbe
Pdmary chain oilbath
as exDlain€d
oD
page 18 aDd remove
tbe outer
balf
of tte
oilbath
thus
exposiDg
tlle clutch. It wil
be seetr
that
the clutch
Dlates
are compressed togetber
by
springs, the pressure
of which
is coolrolled
by
fte
nu$
,
(Fig.
12) aDd
locktruls,4. To
rncrease
-the
spring pressurc,
release
thc
locknuts
a!d.
tiShtcn the nuts B
slightly.
It
is important that
each
ol
I
t.|
tl
|l
t1
fl
il
tl