jet pumps are pretty saltwater safe nowadays with the anodes on them and the materials they use, as for the motor, all modern Marine power and Kodiak marine motors have a t line flush on them where you can attach your hose and let water flow through(with the motor not running) that will flush the heat exchanger and the risers,try to wash the boat down as well to remove all the salt, if you have carpet in the boat spray it down as well, we see more Aluminum rot in the carpet than anywhere else.
dont be afraid to take a jet boat in the salt they are extremely versatile.
Gofish has a great point of advice!! :cheers: