How do you tell if your carburetor needs adjustment?

You can tell if your carburetor needs adjustment if your engine is experiencing rough idling, stalling, or difficulty starting. Additionally, if you notice a decrease in fuel efficiency or increased emissions, these may indicate an incorrect air-fuel mixture. A strong smell of gasoline or black smoke from the exhaust can also signal that the carburetor is running too rich and needs adjustment. Regularly checking spark plug condition can also provide clues; sooty plugs suggest a rich mixture, while white or burned plugs indicate a lean mixture.