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How to pull your jet pump / Something stuck in my pump-engines don't get to full rpm

We often pick up/suck in stuff into the pumps, and this will cause all sorts of problems. Regardless of the model of jet boat, the first thing you need to do is get a good look/feel in the pump to ensure you have everything out. If you are on the water, this isn't always easy, and you may have to take tbe boat out of the water.

If you get it out of the water, look both from underneath, and open up the reverse gate and examine from behind with a good flashlight. Even a tiny piece of hard wood between the housing and the impeller can cause a problem.

If that fails and you are sure there is still something in there, then you need to pull the pump off. This sounds like a daunting things to do, and I thought so too until I did it for the first time. It is EASY. On a Yamaha it involves the removal of 5 bolts and one clip fitting. The only challenge some have had is if the shaft is stuck.....mine wasn't and came out easily. This may be more of an issue for salt water boaters???

Here are some links to threads that discuss this problem for Yamahas
Boat test video explaining the pump system

How to dis-assemble Jet pump video, and photos
  1. I think I have something stuck in the impeller
  2. Easy trick on how to clear debris from your intake while on the water
  3. Damaged impeller linings
  4. Golf ball stuck in impeller!
  5. Photos of stuff stuck in impellers
  6. How to clear your intake grate
For Scarab/Chaparral pump disassembly
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May 29, 2015
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