RUNNING ADJUSTMENTS
Eie. 49
Fig.
50
Jet Centralisation
Efrcient
operation of the
carburettor depends
upon
freely moving
air valve and a correctly
cenhed needle
in t
jet
orifice. The air valve may
be checked for freedom
by
liftir
the
valve
\ ith
the spring loaded
pin
{9t.
A
valve
lailing
fall freely indicates
a srick-ing valre. or
an off-cenrred
jet.
an;/
the needie
(29)
fouling rhe
jit
orifice. Recrify
by renioving
ar
cleaning
the
valve
and bore in
paramn, or by re-centralising
tl
needle in the
jet,
NOTE : When required,
the
jet
needle must
be renewed I
one bearing the same
code number. The
shoulder of t
needle musi
be fitted flush with the lower
face
of the z
valve.
Procedure
l. Lift the
air
valve
(18)
and fully tighten
thejet assembly
(1:
2.
Screw up the
orifice adjuster until the
top of the
orifice
(1
is
just
above the bddge
(28).
3. Slacken
off the
jet
assembly
(12)
approximately
one hi
turn to release the
orifice bush
(23).
4. Allow the air valve
(18)
to fallt the needle
will then
ent
the
orifice and thus centralise
it,
5. Slowly lighlen the
assembly
(12).
checking
frequently
rh
rhe niedle remains
free in the
orifice. Cheik
biraisiie rl
air valve approximately
+"
and allowing
it t6
fal fiee]
The piston should then
stop furr y on the
bridge.
6. Re-set the
engine idling.
l6
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