Triumph TR4 User Manual

RUNNING ADJUSTMENTS
Fig, 16
(tor\
Eig. 41
(bottofil)
ADJUSTMIIN'I'
Setting
the Idle
T$o adjustnent
scrclvs
dre used to
rcgulalc thc idLe sPeed
and nixture.
The throttle
stop scrcw
(3)
contfols the sPeed,
and thc
jel
adjusting
screw
(13)
delermites
the qualitY ol
air-fucl
nlixturc cntering
the cylinders.
Tufning thc
jct
adjustj[g
screw
clockwisc
decreases
thc nixturc strcngthl irnti_clockwise
will enrich.
With the crrgine
rt norntal
working tenlPeratutc,
renlovc
the
air
cleancr
and hold
tbe air
ralvc
(18)
down on
to the
bfidge
(28)
in the throttle
bore. Scfc\\' uP
the
jet
adiLrstr'nent
screw
(13)
r coin
is ideal
fof this
PurPose
until thc
Jct
contacls
Lhe undelside
oi the
ilif
\al!c. F.ol]l
this posilion
lurn down the
jet
adjustirlg scfew
three
turns. This
eslablishes
an appro\inrale
jet
posilion
lioln
\\hich to \!ork.
Run
the e[gine
unlil it is
tl'ro] oughly lvartr and adjust
the
stop
scre\\r
(l)
to
give
an
idle speed of 600i650
r.p.n
The idle
ilixtLlrc is corlect
whcn
the engiue beat is s['looth
and
rcgular and
the air intakc
"hiss"
is equirl on both carburettors-
As a. check,
lift the
lir
valvc a
vely
small anrount
(,i"")
\!ith
a
long thin scrcwdli\el
and
listen to thc cllcct on thc engine.
If the enginc speed
riscs
appreciably. the
rrixture
is
too rich
and, con\ersel\,
if thc
enginc stoPs,
the mixture is too weak.
Properly
adjusted,
the enginc speed
\\'ill either remain const:rnt
or lall slightly
on liliing the
air
valvc.

Triumph TR4 Specifications

General

Brand	Triumph
Model	TR4
Category	Automobile
Language	English