JET NEEDLE
The Jet Needle
is the tapered
rod that is
positioned
in
the
throttle valve by the
'E'-Clip.
The taper of
the needle
increases the clear-
ance between
the Jet
Needle and the fixed
Needle Jet outlet as
the throttle
is
opened.
As the air
flow volume
increases
past
the throttle
slide, the fuel
volume is
also
increased to
maintain the correct
airlluel ratio.
'E'-Clip
Position
Leaner
-T--
'E'Taper
__L
I
'J'Taper
6EJ12-57
Leaner
6EJ12-56
^
TMXss 6EJ12-s5 I
6EJ12-s4
.t
6EJ12-53
Richer
NEEDLE'ELCLIP
POSITION The
position
of the
'E'-Clip
in the Jet
Needle
is
used
to correct or
change
the airlfuel
ratio between
l+th
and
%th throttle
valve
position.
The'E'-
Clipcan
be raised or
lowered onthe
Jet
Needle.
To richen the
fuel mix-
ture
the 'E'-Clip
is lowered on the
Jet
Needle,
raising the Jet
Needle s
position
in the throttle slide.
To lean
the fuel mixture
the 'E'-Clip
is
raised
on the Jel
Needle, lowering
the
Jet
Needle's
position
in
the
throüle slide.
OPTIONAL
JET
NEEDLES To cor-
rect the fuel mixture
at
lÄth
to
l/+th
throttle slide
position
it may be
nec-
essary to change
the Jet
Needle.
The
Jet
Needle will
have a series of
numbers stamped
on
it.
Example:
6EJ12-55.
The
numbers
55 indicate that
the outside
diame-
ter
(O.D.)
of
the
Jet Needle
is
2.55mm.
The
smaller
the
O.D.
the
richer the
mixture.
The larger the
number the
leaner the
mixture.
Typical Jet
Needles Available:
6EN11-54
TMX35
6EN11-53
6EN11-52
o.D.
Straight
Portion
11
2l
3l
4l
5v
Richer
THROTTLE
VALVE
The Throttle Valve cutaway
affects engine/carburetor
response
between
lrbth
tol/ath throttle
slide
position.
The
smaller
lhe slide
numberi
the richer the
mixture.
Available range 3.0, 3.5,
4.0, 5.0, 6.0
(richer
-
leaner).
MAIN JET
The
Main
Jet
is located
in the float bowl and
can be
removed
or
changed
through
the float bowl
drain
plug
hole. The Main Jet controls
the
air/fuel
mixture ratio
from
q+ths
to
wide
open
thottle
position.
The
larger
the number stamped
on the
Main
Jet
the
richer the mildure.
When tuning
the TMX Carburetor
the tuning components
being
used are
relative
to the throttle slide
position,
not engine
RPM
or
actual
vehicle
speed.
Most tuning
can be accomplished
at
relatively low speeds by
mak-
ing note ol
the approximate
throttle
position
at which there
appears lo be a
tuning
problem.
Make tuning adjustments
by adiusting
or changing
the
tuning component
controlling
the fuel
mixture al that throttle slide
position.
FLOAT
LEVEL
ADJUSTMENT
lnvert
carburetor and
remove float
bowl.
The Float
Assembly's actuator
tab should
just
begin contact
with the
Nee
dle
Valve Assembly
when the bottom
of the Float
Assembly
is
20mmfrom
carburetor
bottom
as shown.
Make
required adjustments by bending
actu-
ator tab.
Leaner
t
Richer
8
ActuatorTab
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General