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
