Funny thing, I put thruxton needles in yesterday precisely because of the flat spot between 2500 and 3000 rpm.
Great results - now perfectly smooth through full range of rpms from 1500 through to about 6000 (about as high as I get).
I'm guessing you're going to see about the same results as I am. My setup is: 115 mains, de-baffled & drilled stock pipes, snorkle removed.
If you're keen, I recommend reading the Jenks Bolts carb tuning notes. Its been posted free on this site (I can't find it now) and you can also buy it here:
http://www.triumph-bonneville.com/pr...products_id=96
I found this perfectly diagnosed the flat spot on my bonnie.
P
