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Discussion Starter · #1 · (Edited)
Bought some parts to do a springer seat with the factory bracket still in place and holding all load instead of a frame mount.
I'm using a Harley police K series seat bracket and a basic hinged spring seat bracket. With all parts and bolts its about 50$ to pull of this build.
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Discussion Starter · #2 ·
The k series bracket nearly fits perfectly inside the factory seat bracket but I will need to sand the nose to get it to "seat" properly and allow for proper spacing of the springs by bringing them further forward on the bottom of the pan. The generic hinged bracket will need the slot lengthened but should work great.
 

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Discussion Starter · #4 ·
This shows how much needs radiused off the K series bracket while the other shows how much the slot needs lengthened on the harley springer bracket.
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Discussion Starter · #5 ·
I used carriage bolts with a square base that fits the slot using it to tighten, cleans up the bottom from any bolts and allows for one socket/wrench removal. Getting the large capnut inside the spring takes some force ( I extended the spring by bending it sideways on the end of a small metal rod) Don't expect to get it them out as easy. While still easy to remove from the bike with a pair of long nose locking pliers those springs basically are going to keep those acorn nuts inside forever.
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I used the same piece but cut it down. This is on a 2018 Speedmaster.
Tried barrel type springs of different heights initially, but they were too soft, and made the seat too "floaty", and I had occasional bottoming out on the pressed chrome rear rack.
Pictures show current
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3" torsion style, also called "clothespin". They are much stiffer, which is okay, and make the seat more stable. Cut the nose off the support, which I had to purchase as it is not stock on the Speedmaster, to allow hinge motion. Added a 3/4 aluminum spacer to raise the front of the seat.
Forward section of seat is level, but I have 2" springs on order to lower the rear of the seat for better ergonomics, and get my "butt in the bucket ".
 

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2019 Triumph Bonneville Speedmaster
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This shows how much needs radiused off the K series bracket while the other shows how much the slot needs lengthened on the harley springer bracket. View attachment 726447 View attachment 726448
Hi new to the site and am very interested in your project. Have a 2019 Speedmaster with comfort seat and rack on the guard, as well as floor boards and risers. Would like to try that type of seat. Thought I might look at the Bobber guard but requires cutting off the rear part of the frame. Could do it OK but can’t return to the original. Do you have any photos yet of the finished project? I am in Mackay, Queensland, Australia, so not the amount of accessories down under 😊
Cheers Rob
 
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