Hey Guys! My name is Chad and I just bought a Jet Boat about a month 1/2 ago. It needed some minor things done to the engine and I took care of all of it to get the engine running real good. Only thing is I didnt touch the Jet and dont know much about them. I took the boat for a couple test runs as I was getting the engine right and once I did it was running great. Well this past weekend I took it all the way out to laughlin and the first day out something went wrong. It was running good all day and then at the end of the day I went and got some gas at the station on the water. After I was done getting gas something was different. The boat was moving but as I gave it gas it was barely going anywhere to the point where my engine was screaming and my boat was barely moving at all. I still have direction and reverse but just barely any power at all. Only thing I can think of is its got to be the Jet but I am a Noob to Jets so you guys probly know exactly whats wrong. Could you please help and point me in the right direction on where to start. Im kind of bummed out. I have been prepping all the little things on this boat and getting the engine to run real good since I bought it and it didnt even last a full day at the River =[

You've cavetated the pump, you have something stuck in the impeller. Climb under it and look up in there.

+1

 you can also pull off the hand hole cover and check in there to

Also welcome to SoCal

2sav

it dont take much, one little rock. I could never see into the handhole cuz it was way under the transome, took a peice of copper pipe and knocked the rock out and away we go

yup.. sounds like you sucked up your first rock...

#4 is the inspection cover. Behind the motor but in front of the transom(on most boats). A jacuzzi pump will be very similar.

How did you get that one out crewchief?

Ok.....I will try that and let you guys know what I find. If I come to a problem I will come back with some pics or something. I would also like to know what kind of Jet I have.....it doesnt say on it so I will take a picture and maybe you guys can tell me. Thanks again guys.

I knew I was forgetting something!!

A pair of panties will have the same effect 

Hey GT! Thanks for the reply. I did turn the engine off and then tried it again. It was the same as before. I pulled it out that day and I did look under where the intake grate is and I didnt see anything. But the grate itself is pretty far away from the rear end of my boat.....I havent got the chance to look straight up it yet.
I was going to try that and then try to see if my Jet has a hand hole cover like mentioned before but it looks like boost said somethign about a loader bearing?? Is there something I need to know about that?

Hey GT! Thanks for the reply. I did turn the engine off and then tried it again. It was the same as before. I pulled it out that day and I did look under where the intake grate is and I didnt see anything. But the grate itself is pretty far away from the rear end of my boat.....I havent got the chance to look straight up it yet.
I was going to try that and then try to see if my Jet has a hand hole cover like mentioned before but it looks like boost said somethign about a loader bearing?? Is there something I need to know about that?

sorry for the confusion there is no loader bearing just joking around with Marc.

I'm betting you have one of three problems, now that I think about it.

1. There is something in the impeller, very likely. (unlikely if you were not in shallow water).

2. If this is a new boat to you and someone had the pump apart, they technically could have left the key out of the impeller and its slipping (also unlikely but plausible).

3. The crankshaft on the output broke, I would hope you would know if this were the case. The reason I bring that one up is if you tie the pump up hard and fast enough something has to break, could be the crank or the input shaft to the pump. very very unlikely.....

Hope this helps you out.

BTW haven't heard the story but there is a "loader" bearing joke floating around...

any body :who wants to tell the story about the loader bearing

Hey GT! Thanks for the reply. I did turn the engine off and then tried it again. It was the same as before. I pulled it out that day and I did look under where the intake grate is and I didnt see anything. But the grate itself is pretty far away from the rear end of my boat.....I havent got the chance to look straight up it yet.
I was going to try that and then try to see if my Jet has a hand hole cover like mentioned before but it looks like boost said somethign about a loader bearing?? Is there something I need to know about that?

Your pump WILL have a hand hole cover. They all have them. If you're looking under the boat, you need to look through the grate, not just at the grate.

Good luck.