How do you change the oil in a 2000 Yamaha 125?

To change the oil in a 2000 Yamaha 125, first warm up the engine slightly to thin the oil, making it easier to drain. Next, locate the oil drain plug beneath the engine, remove it, and let the old oil drain completely into a container. Replace the drain plug securely, then remove the oil filler cap and pour in new oil through the designated opening, using the recommended oil type and amount specified in the owner's manual. Finally, check the oil level with the dipstick, if applicable, and run the engine for a few minutes to circulate the new oil.