Nope, no needle. I took mine apart and looks like the atomizer has 2 holes in it. Bottom hole is for midrange. Top hole is for full throttle. There is a hole drilled in the carb housing at the bottom of the slide for idle fuel metering. If you had to, you could drill out the lower hole on the brass atomizer to richen up mid range. On these SHA carbs, the atomizer does not appear to be removable or replaceable.
You could move up to an upper model carb with replaceable atomizer if you need that level of tuning.
We'll see how this one performs first. Should be a lot better than stock carb at least. If it comes down to a need to get midrange tunability, then we'll look for another small carb that will fit (either a Walbro, Mikuni, or higher model Dellorto would work), but then you are into the big $$$. At $60, this little SHA looks to be a nice affordable performance carb.