I cant tell what the carb type is right now...they are all inside a cowl. All of them are over 5 yrs old, and I never adjusted the idle from the original setting. They just run..7000 RPM on an 18-8 Masterscrew and 7300 RPM on an 18-6 Zinger and 92 dbm at 10 ft. I use sid morgan 12% 18% oil
RdeB