Where is the idle adjustment screw on a 1979 xs1100?

The idle adjustment screw on a 1979 Yamaha XS1100 is typically located on the side of the carburetors. Specifically, you can find it on each carburetor body, usually near the bottom. It is a small screw that can be turned to increase or decrease the engine's idle speed. Make sure to adjust it when the engine is warm for the most accurate results.