Triumph TR4 - RUNNING ADJUSTMENTS - CARBURETTOR INSTALLATION; Twin Carburettor Synchronisation and Float Level

RUNNING
ADJUSTMENTS
Adjusting
and
Synchronising
Twin
Carburettor
Installation
_
Loosen
lhe clamping
bolrs
on
lhe rhrotLle
spindle
couplines
bet\^een
the r$o
inslruments.
Nexr,
unscrew
ihe
throttle
srjo
screw to
permit
lhc rhrotrle
in
each
carburertor
to close com_
pletely. a,nd
lig-hren
the clamping
bolts
on rhe
couplings
berween
the
Splndles
ol the lwo
carburettors.
,Screw
in the throttle
stop
screr.rs
(])
lo rhe
poinr \
here
lhe
eno
ot, rne.scre\!
ts
Jusl
conracling
(he
stop le\er
atrached
ro
each rhrottle
spindle.
From
Lhis
point
rotate
rhe
srop
screw
ln
eacn,
carburettor
one
complete
turn
to open
the
throttles
an equal
amount
to
provide
a
basis
from
which
final
speed
of
idle can
be set.
Having
reconnected
the
throltles
and
sel each
oDen
tn
equal
anlounl.
regulate
lhe jer
adjusting
scre$s
(lJ)'in
rhe
lnsrruments
as
detalted
under
lhc
heading..Serring
the
ldle...
ie., three
tums
down from
the
point wherj
the jet
o'rifice
comes
into
contact
with
the base
of
the
air valve
0g).
\OTE
:
Remember
rhal
rhe
idle qualit\
depends
lo
a larce
e\tent
upon
the
general
engine
condirion
and such poinls
as lapper
adjustmenr.
spark
plugs,
and
ienition
iiminp
should
be inspecred
if
idling
ii
n6r
srable.
"lr
is
also
imi
por{anr lo
eliminate
any
leaks
in lhe
induction
slstem.
Float
Chamber Fuel
Levet (Fig.
48)
To
check the
float level,
remove
the
carburettor
from
the
etgine
and remove the
float
chamber.
Invert
the
carburettor.
Check
that the
highest
point
of
the
float,
when the
needle
is
Fis.
48
against
its
seating.
is
i:
"
(14.28
nxn.)
abo\e
the
face
of the
main
body.
Re-sel lhe
Ie\el
by carefull)
bending
rhe
taq which
contacrs
rhe end
of the
needle.
The addilion
;f a
rhin fibre
washer
under
the
needle valve
seat
will
-
effectively
lower
the
fuel level.
t14
-
l5MM)
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