Needles for Mikuni TMS/TMX carburetors Click here for my Jetting Calculator for Mikuni TMS/TMX carbs. Here's what the carbs usually come equipped with:  TMX + TMS needles:  
If you aren't sure what needle jet is in your carb then you'll have to get an idea what size opening the needle jet has by inserting different size drill bits into it unless of course you can unscrew it from the carb. What SUDCO stocks is series 633 S-4/7/8/9, and series 914 S-9.   This is from the Jets R Us website concerning needle jets for the TMX. S-7 has an inner diameter of 2.835mm so if your needle jet is not removable and is impossible to measure then just use that diameter by entering S-7 at E5. That should be close enough to reality.  TMS/TMX Needles from Jets-R-Us: EARLY STYLE TMX35 FLATSLIDE: 6EN11-(52/53/54/55/56/57/58) $7.04 EARLY STYLE TMX38 FLATSLIDE: 6EJ12-(53/54/55/56/57/58/59/60) $7.04 TMS38-77, 78 125cc: 6GDY12-(56/57/59) $7.04 TMS38-77, 78 250cc: 6DGY04-(54/55/56/57/58/59/60) $7.04 TMS 38-78: 6CEM(01/02/03/04/05) $12.04 Example Mikuni TMS needle: 6DEY26-66 The first 6 is the length, which in this case is more than 60mm but less than 70mm The -66 translates to the straight part of the needle. Divide it by 100 and add to 2 so that 66 = 2.66mm in diameter. And 6DEY26-67 = 2.67mm dia. Other options: 6DEY27-66 is a 1/2 clip richer than a 6DEY26-66 Letters DEY indicate triple taper needle. D=1 degree taper, E=1.25 degree, Y=3.1 degree. A=0.25 degrees and increase by .25 degrees per letter increase till G, thereafter the letter increase is .075mm each. Two letters indicates dual taper, and three letters indicates three tapers.   SUDCO has a complete listing of parts, jets, and needles for the TMS and TMX carbs. Their needles are probably machined more precisely than those from Jets-R-Us since all the needles I have bought from Jets-R-Us aren't to spec. |