I wouldn't use the Thruxton needles. Some of us went to Thunderbird Sport needles but I found them too rich. The NH dyno runs seemed to show that the stock needles with 1 shim was the best setup. The TBS needles seemed to fix a mid range power issue but were really rich at the high end. I run Specialty Spares with Uni and drilled airbox 138 mains. I found going back to stock needles and 1 shim was best. You can go to pretty much any dealer and order TBS needles or Thruxton needles but remember the TBS is a triple. Don't order a set of TBS needles cause you'll get 3. Try adding a shim to each stock needle first. If you're not happy then order the new needles.
This thread will probably be moved by the MODS to the performance forum.
