looking for new Nozzels and ADQ Jets

[mspencer]

I would normally go to Dean at DatsunParts.com but they are closed for another few weeks. it is for my 1970 R1600.

in search of...

Thank you.

[Bwk2000]

Send Keith (keith0alan) a PM. He can probably hook you up.

[keith0alan]

Contact Ztherapy to have the nozzles rebuilt. I have ADQ needles on order from England. Should be here in a week or two.

[mspencer]

picked up the nozzles from Ztherapy. (thanks Steve). On one of the carbs when I push the plunger up and let it fall, it comes down normally but does not completely close? I loosed the nut for the nozzle and it closes all the way but the nut is loose. if I try to tighten it at all the plunger does not come all the way down. how do I resolve this? (this is with the choke disconnected from the nozzle) the other carb does not have this issue.

Thanks for the help.

https://mydigitallife-my.sharepoint.com ... g?e=lWQ8i5

[keith0alan]

Welcome to the joy of centering nozzles. Sometimes it goes great other times it takes a number of tries.

[mspencer]

is there a trick or process to centering? do I adjust the needle or the nozzle sleeve or both?

[keith0alan]

The nozzle sleeve gets adjusted. Loosen, wiggle, retighten, check, repeat until it drops cleanly. Wish I had a better answer. Sometime one try, sometimes 20 tries.

[mspencer]

thanks, just wanted to make sure i was not missing something.
Thanks

[mspencer]

so after hours of working on it i have it so it drops cleanly all the way to the bridge every time.... BUT when i snug down the pot screws (4) it stops about a 1\4" from the bridge. loosen the 4 screws and it drops to the bridge.
Does this mean the piston and pot need to be replaced?

Thanks

[spl310]

Are you snugging them down one at a time, or a little bit each?

[mspencer]

just a little at a time, cross pattern.

[keith0alan]

Center the nozzle after you tighten the dash pot screws.

[Bwk2000]

The nozzle sleeve gets adjusted. Loosen, wiggle, retighten, check, repeat until it drops cleanly. Wish I had a better answer. Sometime one try, sometimes 20 tries.

How was this assembled at the factory in the ‘60s? There must be a more effective way to seat a needle than trial and error? Some form of calibration assembly tool or similar, no?

[spl310]

Here is one method:

https://mossmotors.com/su-jet-centering ... g-EALw_wcB

[Bwk2000]

Here is one method:

https://mossmotors.com/su-jet-centering ... g-EALw_wcB

So, there’s a tool for that then. Is this the solution to everyones problems?

Reason I’m asking, even though I haven’t done this on SU carbs, I have done it many times in the past while rebuilding various holleys, edelbrocks, thermoquads and quadrajet carbs and it never was an issue … even with the ridiculously over-engineered quadrajets! Seems strange SUs would be such a PITA, and sooner or later, I will likely have to tackle one.