Triumph TR4A - Jet and Throttle Interconnection Adjustment

SUPPLEMENT
unscrew
the throttle adjusting
screws a little, each
by the same
amount to reduce
the speed.
Using the lifting
pin below the
suction chamber, lift the
piston
of
lhe lront
carbure
or approximately
$
"
{
75
mm.):
(a)
If the
engine
speed
increases,
the mixture
stuength of the
front
carburettor is too
rich;
(b)
If the
engine speed immediately
decreases,
the
mi{ture
strength of the
front carburettor is
too weak;
(c)
If the
engine
speed
momentarily
increases
very slightly,
the mixture
strength
of the front
carburettor is conect.
Repeat the
operation at the rear
carburettor
and, after adjust-
ment, re-check
the front
carburettor,
since the two
carburettors
are interdependent.
When
the mixture
is
corect the
exhaust note should
be
regular
and eren. lf ir
is irregular wiLh
a splashy t)pe
otmisfire
an-d
$
ith a
colourless exhaust,"rhe
mixrure
ii roo'wiak. lf
there
is
a
rhythmical
type
of misfire
in the exhaust beat
together with
a blackish
exhaust the mixture
is too rich
(Fig.
6).
(d)
Set the clamping levers
so that each link
pin
is
0.006"
(0.15
mm.)
away from
the lower
edge of its fork, when
the lever
welded
to the centre
of the throttle
rod is in
contact with
the
undeNide of the
choke bar. Re-tishten
the bolts (7).
Fig. 2.
Jet and Throttle
Interconnection
Adjustment
Slacken thejet link-rod
bolts.
Adjust the link
rod assemblies
to their lowest
position
and re-tighten
the bolts, thus
ensu ng
simultaneous movement
when
the choke bar is
rotated.
Check and if necessary
adjust
the
setting of the choke
control
wire.
This should pemit 0.0625"
(1.6
mm.) ftee movement,
before
starting to pull on the
jet
levers.
Pull out the choke
control
knob
until the free movement
is
eliminated and the
jets
are
just
about to
move. Adjust
the fast
idle
screws
(6)
Fig. l, to attain an engine
speed of 1,000 to 1,100
r.p.m. when
hot. Re-fit the air
cleane6.
I
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C. Rich