Needles/Jets For Mikuni VM/TM carburetors Click here for my page verifying the Jetting Calculator for Mikuni VM/TM carbs. Listings of all the Mikuni VM needles: Sudco NicheCycle. Click here to downlad an Excel sheet which gives dimensions on absolutely all the Mikuni needles ever made. (The Mikuni needle data on my spreadsheet is even better than what they list because it has corrections for obvious errors they made in copying.) Here's what Mikuni VM's typically are equipped with. 
VM needles: Series 4 for VM18-24 carbs 
Series 6 for VM30-38 spigot, TM38 carbs 
Mikuni TM carbs :  TM NEEDLES TM24, TM28, TM32, TM34: 5D120 5FL14 5DP7 5F3 5L1 5F12 (lean --> rich) $7.04 TM24, TM28, TM32, TM34: 5DL31 5DP10 5DP39 5E75 5EP6 5F21 5FP17 5FP96 5J11 5N13 $7.04 TM33-8012 PUMPER CARB: J8-5FP96-3 $7.04 TM38 FLATSLIDE: 6DH2 6F9 6DH3 6l1 6DP1 6DH4 6DH7 6DH8 6FL14 6F15 (lean --> rich) $7.04 TM38 FLATSLIDE: 6DJ30 6DP4 6DP17 6F4 6F5 6F8 6F16 6F21 6FJ6 6FJ40 6FJ41 6FL25 6J1 6FM46 6N1 $7.04 TM36 TM38, 39 + 41 PRO SERIES: 6FJ41, 6FM46, 6FJ40, 6DP4 $7.04 Here's what Mikuni TM's typically are equipped with. 
The normal #5 series of standard Mikuni needles are suitable for the TM34, and the #6 series is good for the TM36 to TM38 non-pumper carbs. Listings of all the standard Mikuni needles: Jets R Us (but theirs aren't all genuine Mikuni needles). NicheCycle and Sudco also have needles. SUDCO: VM carb parts, Mikuni needles, Mikuni jets, VM slides, TM carb parts. (The #5 and #6 data on my spreadsheet is even better because it has corrections for obvious errors in copying.) Each MIKUNI NEEDLE is identified by the letters and numbers stamped on them. Example: 6FH7 6 is the length, which in this case is more than 60mm but less than 70mm F is the top taper, H is the bottom taper (sometimes the needle has only one letter, in that case it refers to a single taper) A=.25*, B=.5*, C=.75*, D=1.0*, E=1.25*, F=1.5*, G=1.75*, H=2.0* etc 7 is a mfg code not normally used in tuning.  Needle Jets available from Niche Cycle: series 454 for TM 24mm (P8, Q0, Q8) series 175 for TM 28 (O/P from 0 to 8) series 640 for TM 33 w/accelerator pump (P-4/6/8, Q-0/2) series 389 (for TM 32/34/35/36/38mm) (#O/P/Q/R from 0 to 8). series 568 for TM 36/40 w/acceleratr pump (P-0/2/4/5/6/8, Q-6, Y-0/2/4/5/6/8, Z-0/2/4/5/6) Needle Jets from PJMotorsports: series 499 for TM 33 (P-2/8, Q-0/2/4) NEEDLE JETS Here's the chart showing the inner diameters of the jet holes:  This shows what needle jet series is used in each model carb and which ones are available from SUDCO. One's for carbs under 24mm aren't available.  continued...  Here's a list of needles recommended based on their taper angles being close to 1.5* which is the best universal angle. If you have any questions then just email me at 19jaguar75@gmail.com |