How do you tune ucal carb?

To tune a UCAL carburetor, start by ensuring the engine is warm and at idle. Adjust the idle mixture screw to achieve the best idle quality, usually by turning it in until the engine stumbles and then backing it out slightly until it runs smoothly. Next, set the idle speed using the throttle stop screw, aiming for a steady RPM according to the manufacturer's specifications. Finally, for performance tuning, adjust the main jet and needle clip position based on how the engine responds during acceleration and under load.