Polaris 3900 back up valve very weak


New member
Dec 16, 2019
Sydney, Australia
Hi guys
I have a Polaris Sport 3900. The back up valve is very weak so it will typically stay stuck in the same corner.
I have spent some time reading the forums but couldn’t find the answer.
check this link for the videos: iCloud
In the past month I have replaced the wall fitting and also back up valve.
the RPM is running at 30 ( revolutions in the water)
The videos above include
1) normal operation
2) out of the water general leaky backup valve
3) a back up valve operating then going back to normal
4) 2 examples of how weak the back up valve is. You can see the Polaris hardly moves

love to get any tips and tricks you may have. Thanks in advance!!!
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