How fast is a 440 stand up jet ski?

A 440 stand-up jet ski, typically referring to the Kawasaki JS440, has a top speed of around 40 to 50 mph (64 to 80 km/h) depending on conditions and modifications. It's designed for agility and maneuverability rather than outright speed. The performance can vary based on factors like rider weight, water conditions, and any aftermarket enhancements.