I bought an 83 RX7 12A that had all the emissions and rats nest removed, and the nikki was completely stripped. I have gotten the engine into the GLC, and after months of parts searching, and rebuilding I was able to get the Nikki back to a slightly stripped version. I was aiming to go with vacuum secondaries but as I have been trying to tune everything, the whole setup just falls on its face at about 2500rpm, I think the secondaries aren't working, but I

have hit my limit of capabilities and I don't even know where to go with this setup

 

Welcome to forum

 

Moved this to the 1st Gen section

 

Check fuel pressure and the fuel level in the bowls through the sight glasses.

I see you have the return line hooked up, is the restrictor orifice in the hose? I'd just cap the return off regardless, it basically does nothing.