07-20-2012, 11:51 PM #1
Loud Vibration/Rattle from Rear of STX15
To make a long story short, there is a very loud vibration or rattle noise coming from the rear of my ski. I first noticed this on my second to last trip out on the ski. I was taking my friends tubing on the river when I first discovered the noise. The water level was very low, so I figured that maybe some "sea weed" was sucked into the impeller. Before the next trip out, I checked the impeller and did not find anything stuck in there. While out on the lake with my girlfriend, I noticed the noise again right away. It seems to be most prevalent at idle, but it is possible that the increased noise from speed could drown it out. I let her drive and tried to see if i could figure out exactly where the noise was coming from but didn't have much luck. When we got back I put the ski on the trailer and left it in the water. While running the machine I lifted the seats and I'm pretty sure the noise is coming from the rear of the ski, meaning behind the motor. It seemed to be somewhere underneath the small removable seat or the spot where the third person would sit.
I know a mechanic who works at the local dealership and he warned me that they had a few of these machines come in with driveshaft issues. I believe he said that in one case, it caused catastrophic motor damage. I sent him a text but did not get a response. Could this be my issue? I would like to ride on the lake tomorrow but do not want to risk damaging my ski. Does anyone have any idea what could be wrong or what could be going on? Or even any areas to check for the vibration to see if I can get it to stop? I also get terrible gas mileage if that could have anything to do with it. I had another thread about that in the past but while tubing on the river I got only 4 MPG while never running at speeds greater than 45 MPH.
07-20-2012, 11:58 PM #2
- Join Date
- Jan 2009
How many hrs on the ski ? Check your. Pump bearings could also be broken baffle in the water box
07-21-2012, 12:14 AM #3
07-21-2012, 04:36 AM #4
07-21-2012, 09:19 AM #5
07-22-2012, 12:34 PM #6
My 15f has been doing this for 30 hours of use since I got it. I have replaced the pump housing, new bearings, impeller, driveshaft bearing (driveshaft runout was ok) & its still there, I did notice the primary muffler was touching the hull in a couple places so I slide some rubber sheeting between it & the hull, the noise is slightly less, but still there. On mine the noise goes away when making a turn, weird, could be a broken part in the waterbox, I haven't had the time to remove it yet to check.
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