How do I know if my Jet-Ski is a four stroke or a two stroke?

To determine if your Jet-Ski is a four-stroke or two-stroke, check the owner's manual or the manufacturer's specifications, which usually specify the engine type. Additionally, inspect the engine: two-stroke engines typically have a simpler design with fewer components and may have a visible oil reservoir for mixing with fuel, while four-stroke engines have a more complex design with separate oil and fuel systems. Listening to the engine can also help; two-strokes often have a distinct, higher-pitched sound compared to the deeper, smoother sound of four-strokes.