Aftermarket flex shaft installed correctly

[Nelson Eckert]

I purchased a aftermarket flex shaft from here. I put it in over the weekend and it doesn't seem to go in as far as the stock one. There seems to be a little more space in front of the piece with the set screw. I am new to boats and don't know what the parts are called.

[jfrancisco892]

The piece with the set screw is called the drive dog. In regards to not going in as far as the stock one, you want to have around a 3/16" gap between the drive dog and the strut. This prevents any binding between the drive dog and the strut and keeps the load on the driveline to a minimum. From my experience I would also check the bushing (part that goes into the brass tube and typically in rtr boats is not exposed outside the strut so you'll have to take the strut off to access it) and make sure that it floats freely inside the brass tube. Also slide the bushing onto the prop shaft of the flex cable and make sure that that also spins freely. All of this is going to make sure that the driveline spins as freely as possible and it prevents any unnecessary load on the electronics.

[rickwess]

That looks like a Revolt. The gaps looks OK. It does look like you're missing the floating bushing. It has a shoulder that prevents it from going all the way into the strut (see below).

large__04_04_2007_17_39_ros-21-strut-bearing.JPG

[Nelson Eckert]

The boat is brand new any chance it would not have come with a floating bushing?

[rickwess]

Anything is possible. Is it a Revolt?

[capnswanny]

I'd pull the shaft and look in the strut to see if its there..might be shoved in if the stuffing tube doesn't run flush with the end of the strut. You should notice that the end of the prop is wobbly with that piece missing.

[rickwess]

Here's a link to the manual. Page 11 talks about the gap between the strut and the drive dog.

http://manuals.hobbico.com/aqu/aqub24-25-manual.pdf

[PawPaw88]

You should replace that jam nut with a nylon lock nut, or at the very least put some blue locktite on the threads.Those billet / jam nuts will come loose