Does the Z400 carb have a pilot jet?
I haven't seen any post about changing it, just the main jet. I changed it on my other bikes that I did mods to. What about this carb?

 

My Z came with a #122.5 pilot jet. After installing a Yoshimura full pipe I increased the pilot to a #125 to pick up the bottom end that I lost. I am also running a #140 main jet with the air box lid removed. The needle is not adjustable on the stock carb. I'm at 4500 ft. elevation. This jetting seems to work the best at this altitude.