im building a 19 daytona with about 750hp. Im wondering if installing a jet away is a must? i heard that if i loose a motor at 80mph+ im doomed.. true or false? this is my 1st jet boat.

what is the complete purpose of them and what do they do how do they work?

delete delete delete,  Ya, like he said 
(hate that when someone posts while your posting, lol)

-Rebel

oh...how long can i run a boat out on the trailer without burning my pump. I was thinking 1 or 2 minutes

water to the motor of course

thanks for the info brad!

oh...how long can i run a boat out on the trailer without burning my pump. I was thinking 1 or 2 minutes

water to the motor of course

I'd never run without water, however, can run all you want if running water in it; why would you run water thru the motor but not the pump:
If you run water thru the pump, there is NO PROBLEM running it out of water.
I used flytime's idea: put a hose splitter on the hose; one hose from splitter has male connector, the other has female; disconnect interior hoses then connect to splitter hoses; turn pump water on before turning engine; turn engine water on after engine starts.
I read much on this; many say never do it, BUT, flytime told me he checked with Berkeley directly, then I emailed Berkeley and got a quick reply that it is NO PROBLEM if running water in the pump.
In fact, the Berkeley guy said run a hose up the nozzle; but it's better to disconnect the inside hose and run it directly into the pump (connecting another hose to run thru the engine to cool).

http://www.socaljetboats.com/index.php?topic=556.msg16667#msg16667

I had my pump rebuilt by MPD , Jack does not recommend running your boat out of the water, ( front seal doesn,t get water or at least not much) but he said you can if you have to , do it like Wanabe said and run water in your pick line and run a hose through the back of the pump.