How do you change the oil on a 1989 2 stroke Kawasaki jet ski?

To change the oil on a 1989 2-stroke Kawasaki jet ski, first, ensure the engine is warm to help the oil flow out easily. Locate the oil drain plug, typically at the bottom of the engine, and remove it to drain the old oil into a suitable container. Replace the drain plug, then fill the oil reservoir with fresh 2-stroke oil, following the manufacturer's specifications for the correct type and quantity. Finally, run the engine for a few minutes to circulate the new oil, checking for any leaks.