Bumping this as a PSA.... Noticed our pylon was flexing a while back. So, I got the u-bolts really tight - default answer, although they seemed tight already.
Still flexing, so found this thread.
The top pylon u-bolt connects to good size aluminum angle iron that is bolted to the hull/stringer/whatever. Solid.
The lower u-bolt connects to aluminum angle iron & plate that connects to the floor via the bolts from the front skeg, as mentioned above. They were all loose. So pretty sure I found the problem....
The rear 2 bolts were double nutted, and the 2nd was nylock nut. Good job MC.
The front 2 bolts are barely accessible, only by open end wrench, doing part turn, then flipping wrench over to turn more. Repeat, etc.
The pylon comes down to almost contact the front 2 bolts, so not sure about a double nut there, as I don't think there is enough space. Ideally, the skeg would have longer base and these bolts would be accessible thru the floor cooler box thing.
Haven't skied yet, but as stated, I can't imagine taking these from finger tight to "tight as i can get 'em" with the wrench won't fix it....
Thought this would be a good thing for folks to check at winterization vs having to mess with in middle of summer!