Bonneville America Forums Forums Technical Forums Performance Mods TBS needles=performance or driveability?

Also, Larry, not sure what pipese you are running. I have short TOR's and went down from 130 mains to 125 with the TBS needles drilled airbox, Uni,etc., and although that cured the rich condition I had with the 130's, I ended up putting a shim under the needle to richen up the bottem end a little. So far that combo (#125, TBS, 1 shim)is working pretty well. You might try it just to see, its pretty easy to add or remove the shims.