Not the needle that goes in the slide, the needle jet is the removable emulsion tube that the main jet threads into. The TMX from the 01 CR had an overly rich S-9 needle jet which made them fat in the midrange & made them feel sluggish transitioning from the idle circuit to the main jet. I swapped the S-9 needle jet out to an S-8 on my buddy's 01 CR & put in a 400 main & it woke that bike right up. It was a different animal after that simple jetting change. Those needle jets are $22 from jets-r-us. The Mikuni TMX has gotten a bad rap over the years but there really hard to beat when set up properly. They have more tunability built into them as well.