Starts and runs and RPMs are good but it won't go above 5 MPH. Checked intake and I have the rooster tail of water but no speed

Hi, where is the pump unit. When I started getting this power issue, My girlfriend ran up on a sandbank just under the water and i know it pulled a bit of sand through the bottom and then got off the sand bar but its not been right since, Ive checked the bottom, taken the intake plate off and inspected it for rocks or any other obstruction but cant find anything blocking it. Hi, where is the pump unit. When I started getting this power issue, My girlfriend ran up on a sandbank just under the water and i know it pulled a bit of sand through the bottom and then got off the sand bar but its not been right since, Ive checked the bottom, taken the intake plate off and inspected it for rocks or any other obstruction but cant find anything blocking it.

the pump will be on the end of the motor crank shaft
it could be a direct coupling or a small shaft with the pump separate
the pump is a centrifugal pump with a series of vanes and diffuses inside it to increase propulsion
if it was on a bank then any number of items could have been sucked up and damaged the vanes or diffusers
have it checked out by a specialist jet propulsion service center the pump will be on the end of the motor crank shaft it could be a direct coupling or a small shaft with the pump separate the pump is a centrifugal pump with a series of vanes and diffuses inside it to increase propulsion if it was on a bank then any number of items could have been sucked up and damaged the vanes or diffusers have it checked out by a specialist jet propulsion service center