I’m surprised that a gauge to measure the depth of the jet in the Z SU ‘s hasn’t been created. Seems like a little spring loaded gauge inserted in the jet track to expose depth of the jets would be simple for some of us that sell cool products ( 3D printing) on this forum. It would eliminate “how many turns down” which is kind of a screwy way to get where you want to be on your mixture. Anyone agree?

Would calipers not work?

Pretty easy to do, simple scaling down of a surfboard caliper would do the trick. If I get time I'll design one up this week. here's a couple of basic designs.

Edited 4 hours ago4 hr by SpeedRoo

How is that any more than just a guess - like the "I'm turning down the knob 2 1/16 turns"? Don't you need to know the AFR created by adjusting the jet position? And isn't the position different for varying temperatures and elevations?