Using this Comet Racing Engines blueprinted Tillotson HW27A X30 carburetor is straightforward. First, make sure to install it correctly on your engine according to the manufacturer's instructions. When starting your engine, give it a bit of time to warm up. For better performance, you can adjust the settings based on the X30 class you've chosen. As for maintenance, check the carburetor regularly for any signs of wear or clogging. Clean it every few uses to keep it in top shape. Also, remember that this carburetor is custom - built, so treat it with care. And since there's a shipping fee because of the engine shop labor, handle it gently to avoid any damage during installation or use.