Thats the one Steven, a great reference tool. (Can't call it a guide as some may be offended)
Notice the three curves related to the needle -
position (shims are our positioning tool),
Taper (check the stock/TBS/Thruxton side by side and you will see huge differences in the three. The
diameter is also different at differnt places. So, shims and needles will give you a lot of wiggle room for almost the entire throttle range - at least the parts we use 99% of the time. Now can you see how needles have a dramatic effect? Simple things are sometimes the simplist answer.
