2017 FSH 190 Speed Drop

[Zooted]

First time poster.. I have a 2017 FSH Sport and this weekend while taking it out, I noticed that at full throttle the speed would slowly decrease after 15 minutes. I though maybe something was caught in the impeller so I inspected the clean out, all good. After a few minutes we ran at full throttle again. Same issue. After 15 min it would slowly speed down. RPMs never dipped. Another strange thing I noticed is once we were stopped, the bilge pump would pee for quite a while (~3min).

This happened on 5 diff occasions... Anybody experience this before?

 

[Dixemon]

Its a proven fact that adding weight to these boats will slow them down even at a constant rpm. So if you suspect your taking on enough water to slow your boat down than that should be your primary concern.

Read through this thread and see if you can find the source of the leak. https://jetboaters.net/threads/the-ultimate-leak-finding-thread-post-if-you-find-a-new-source.6684/

 

[Zooted]

I will start with this. Thank you!

 

[FSHER]

I was having a similar issue so I trailered it to the house, installed the drain plug like normal and put a garden hose in the boat. I was shocked at how much water was leaking out the drain plug. Turns out I wasn't installing it nearly tight enough to create a decent seal. after a long day on the water a small leak turns into a large problem. or you might see something else leaking. if its leaking out off the water, its leaking in on the water.

-Mark

 

[Zooted]

I was having a similar issue so I trailered it to the house, installed the drain plug like normal and put a garden hose in the boat. I was shocked at how much water was leaking out the drain plug. Turns out I wasn't installing it nearly tight enough to create a decent seal. after a long day on the water a small leak turns into a large problem. or you might see something else leaking. if its leaking out off the water, its leaking in on the water.

-Mark

I'll add this to my list of tests. Thanks Mark!

 

[lazergeek]

I was having a similar issue so I trailered it to the house, installed the drain plug like normal and put a garden hose in the boat. I was shocked at how much water was leaking out the drain plug. Turns out I wasn't installing it nearly tight enough to create a decent seal. after a long day on the water a small leak turns into a large problem. or you might see something else leaking. if its leaking out off the water, its leaking in on the water.

-Mark

@FSHER Check your O-ring. I have the 2021 FSH 210 too and I don't have to have the drain plug very tight to seal it. It took fixing a few other things but I get zero water in my bilge now.

 

[lazergeek]

@Zooted Your boat is old enough check the hose clamps in the rear bilge around the clean out tube and driveline hoses. That would cause more water to come in while under power then while sitting. Those hose clamps break once they start corroding.

 

[Zooted]

@Zooted Your boat is old enough check the hose clamps in the rear bilge around the clean out tube and driveline hoses. That would cause more water to come in while under power then while sitting. Those hose clamps break once they start corroding.

Yep. That's the first thing thing I'm going to check once I get back to it.