Sterling jets
 

I have a Sterling carb that I bought second-hand on the forum, and it is currently running too rich for my setup (not to mention the fact that I live at 8000ft). Does anyone know where to find compatible jets for fine tuning?

Sterlingmetalworks.com still seems to be down...

Holley jets, Batman!

+1

as I understand it Sterling carbs were reworked to use common Holley jets. Those guys, they're thinkers. (Sterling and Carl)

Well, to be precise, I think they're supposed to be Holley HP Dominator air bleeds, part number HLY-126-XX-Y, where XX is the jet size and Y is the amount you're getting. At least that's what it was as of 2004.

What sizes do you have in the carb currently?

The Nikki fuel jet threads are metric, but they are so shallow that Holley SAE 10-32 thread jets with 1/4" crown fit very well. So I tap the emulsion tube heads to accept this same size just for the ease of ordering both fuel and air jets.
I still don't offer them for sale, but we're working on that.
Stock fuel jets, although metric, convert to .036 and .063. Only in extremely rare applications should you need to go beyond the .063 for the secondaries with a 12A; even a mild SP. I would recomend not going any higher than .055 for the primaries. Chances are, your primary air jets are too small, at .023. Carl has done some testing , and found that my previous jet recommendation is too rich. I suspect that the .023 primary bleed may be over whelmed at high RPM, and an actual siphoning effect is occurring when the primaries are at WOT, just before the secondaries open. Once they open, the signal is split, and the siphoning stops. This presents itself as a surge in power as the air/fuel ratio suddenly becomes stoich, which decievingly appears to be an accelerator pump adjustment problem.
My recommendation is to run 043 primary bleeds and tune from there.

Thanx!