Can you put a 4 stroke engine in a 1997 Kawaski jet ski?

Yes, it is possible to install a 4-stroke engine in a 1997 Kawasaki jet ski, but it requires significant modifications. The original jet ski design is typically optimized for a 2-stroke engine, so changes to the engine mount, exhaust system, and fuel system would be necessary. Additionally, you would need to ensure compatibility with the jet pump and other components. This project may be complex and could affect the jet ski's performance and handling.