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Old 09-19-2014, 12:36 AM   #1
co2l
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03 ACE 750 with a rigid frame; I kept everything in front of the gas tank and had the frame custom bent. I'm only 170# wet so the 3" coils and 3" hairpins just weren't giving me any cushion. I have a 4-leaf spring from a trailer (brand new) and am looking for ideas on the mounting. Welding is not authorized because it'll take the temper out of the spring. I'm thinking of replacing the tank bolt with a grade 8 and mounting the tank through the leafs and still bolt it to the stock mounting point, reducing the amount of rubber between the tank and springs. The spring is curved up, so I'm not worried about it whacking my rear fender (and I'll add bump stops). I might need to close up the end of the box that the tank mounts to, but we'll see.
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Aaaaaaannnd go...

I swear, I have a motorcycle...

Last edited by co2l : 10-03-2014 at 10:07 PM.
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Old 09-19-2014, 07:21 AM   #2
bob_suruncle
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It was tough standing on my head to view your pictures...... you are going to use more than just the tank bolt though right?
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Old 09-19-2014, 01:20 PM   #3
co2l
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My plan is to go through the entire piece of square tuning that the tank mounts to and use some U bolts to secure it on the sides. I was going to try and not weld since I don't have the setup for it. If it proves not feasible I'll have to find somebody that can, though. The work I had done a few years back placed the seat really high and I'd like to get rid of that and go for something different. It's hard to figure out that first pic: the view is where the stock seat slid in to secure the front and cover the tank bolt.
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Old 09-22-2014, 09:03 AM   #4
bob_suruncle
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Make sure you document with pictures..... right side up please
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Old 09-25-2014, 12:46 AM   #5
custm crzy
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Just my opinion but the seat height needs to come down some... Now for some welding info if u use spring steel to mount the seat then it needs to be bolted in some fashion.... spring steel will break if welded maybe not immediately but it will at some point.. And I for one wouldn't want my seat coming out from under me running 85 down the interstate.. As u said its a tempered material...
Only idea I can come up with without eyes on it is cut the eyelets off the ends and u bolt it in some fashion.. Don't know y u can't find springs that will work for ur weight.. U can get them in different spring rates.. I'm 210lb 6ft and can find them that work for me.. The springs on my wife's bike were originally for one of my projects and I never bottom them out wen I ride hers to check it over..
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Last edited by custm crzy : 09-25-2014 at 12:56 AM.
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Old 09-25-2014, 02:11 AM   #6
co2l
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That's crazy, on my phone the pics are right-side-up... I'll try to fix it. The leaf spring is a four-leaf set and I think I'll only use three; the long one in the middle with the shortest one on top and the second longest on bottom. I'm still engineering the mounting point, but I think I'll install it through the tank mountains no point with a couple extra u-bolts to help. The spring is only 2.75" wide and about 5/16" thick so we're looking at about an inch over the current mounted height with the tank sitting on top. The curve should allow the seat to sit about even or a bit lower than the mounting point but we'll see when I start to mock it up and cut springs. I'll post pictures.
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Old 09-27-2014, 03:19 AM   #7
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Okay so I started to work on the seat. As you can see, it's a standard, cheap, solo spring seat being held on with a $20 bracket set and hairpin springs. The frame is custom job I got in Denver (but I wouldn't recommend that place to anybody for many reasons) that ended up not being what I was looking for. The seat height was the main issue as well as a few misaligned mounting points, like the springs and the fender attachment points, but hey, that's what you get for a super high price and a hangar queen for two month. The idea for the leaf spring seat came from a few XS650 forums and a great triumph build on choppercult.com. You can see the current setup, how it mounts, and the disassembled leaf spring set. I'll post more pics as they happen.

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Last edited by co2l : 09-27-2014 at 05:17 AM.
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Old 09-27-2014, 05:18 AM   #8
co2l
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Did somebody fix my pictures? You guys are great! That last pic is just to show how the seat was with the hairpin spring solo seat. I'll get my finished pics up tomorrow. It rides like a champ!

Last edited by co2l : 09-30-2014 at 02:48 AM.
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Old 10-03-2014, 12:45 PM   #9
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Alright, so what I did was take the spring set apart and figure out which pieces I wanted to use. The main spring seemed to have enough juice in it to handle my weight so I went with just the one piece. First I laid out all of the pieces being used to make sure it made sense.
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I figured out that I needed to find a way to stabilize the seat on the spring so I grabbed a couple pieces of kydex and used them as spacers around the (yes, i know...) rebar and it works great.
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I reused the bracket that held the spring set together to keep the nose down on the spring. This also allows the spring to flex without fighting the seat and keeps me from having to drill a hole to stabilize the nose of the seat.
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I had to fabricate the side angles out of 1/8" aluminum flat stick that I had but it works to hold the kydex spacers tight and centered everything up nicely.
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After I got everything together, it has significantly dropped my seat height from a few inches above the tank mount to whatever it is now (nose is flush). Refer back to my first few pics to see what I had before.
Next I had to clean up the bike so I took an angle grinder with a cutoff wheel and took away the old mount.
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I had to find a way to keep the pressure off of the tank bolt until I get another bolt (and after that, actually) so I grabbed a piece of coil spring, threw it in my forge and hammered it out to shape, not pretty but good enough.
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I drilled a couple holes in the collar to anchor it to the frame and slid the spring underneath it to take the tension off the bolt. Lastly I tossed the tank back on and cranked down on it. It went together better than I thought and is really comfy to ride on. I might try to other, slightly longer half, of the leaf to see if the extra length makes it softer or if I have the clearance over my fender. I hope this helps anybody who is thinking about doing it.
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Attached Images
File Type: jpeg seat assembled profile.jpeg (127.0 KB, 184 views)
File Type: jpeg collar installed top.jpeg (528.1 KB, 180 views)

Last edited by co2l : 10-03-2014 at 03:08 PM.
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Old 10-03-2014, 02:08 PM   #10
bob_suruncle
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It looks cool but how well does it work?
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