TMX/TMS Carb Tuning

IMPORTANT TUNING CHARACTERISTICS

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 clearance 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 air/fuel ratio.

NEEDLE 'E'-CLIP POSITION

The position of the 'E'-Clip in the Jet Needle is used to correct or change the air/fuel ratio between 1/4th and 3/4th throttle valve position. The 'E'-Clip can be raised or lowered on the Jet Needle. To richen the fuel mixture the 'E'-Clip is lowered on the Jet Needle, raising the Jet Needle. To lean the fuel mixture the 'E'-Clip is raised on the Jet Needle.

JET NEEDLES

To correct the fuel mixture at 1/8th to 1/4th throttle slide position it may be necessary to change the Jet Needle. The Jet Needle will have a series of numbers stamped on it.
Example: 6EJ 12-55. The numbers 55 indicate that the outside diameter (O.D.) of the Jet Needle is 2.55mm. A smaller O.D. number gives a richer mixture. A larger O.D. number gives a leaner mixture. Typical Jet Needles available:

PRO OPTION-TMS38 NEEDLES FOR 125 AND 250 CC ENGINES WITHOUT MAIN JETS
(Each kit contains a selection of 5 different needles)

IMPORTANT NOTE: If your current correct jetting using a TMS Carb falls within this guideline table, you may achieve improved performance with the Pro-Option Kit, Example: TMS38 with 6DGY04-57 and 360 main jet, choose TMSJN250/57.