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Old March 31st, 2013, 03:06 PM   #1
mikef
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Default building an '81 gs550

traded for a few suzuki gs bikes and am working on the runner, an '81 gs550

it had been "modded" by the previous owner, nothing serious but not my taste per say.



rode it a few times like this. the seat was horrible, and the seat height was not to my liking. i figured id hardtail it and be done with it. tossed some struts on it to test it out ( so suspension at the seat either) and quickly changed my tune.

i decided to lengthen the swing arm. i've seen the shocks run at more severe angles on other builds with no ill effects. i'm only going to stretch it about 3". this is were my mind is blocking me. i want to remove everything behind the shock mount and the bar in front to lower the seat height.




the new tube is my idea but i don't think it will work to well. last thing i want is the frame to fold and the shocks to stab my back. a curved piece, to replace the flat stock tube between the main frame and shock mount, might do the trick with some gusseting but i don't have a bender. maybe a solid slug down the main tube for the shocks about 10"s then the tube for the hoop. make any sense? a seat for the remaining area wouldn't be to hard to find and install, a stock take off of something would suffice.

any ideas/ input?
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Old March 31st, 2013, 10:59 PM   #2
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that shock angle will really soften the ride. maybe extend the arm and weld on some new shock mounts with shorter shocks if thats the look your after.

as for the rear shock area, either a rear loop at the back or a straight bar across by the shocks.

yeah you'll need to sleeve the rear tube area for the seat tubes, i sleeve the inside for a cleaner look. no gussets need and i beat the hell out my bike for a few years. don't use solid stock, tubing is better cause it'll give a little more and can you weld solid stock?
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Old April 1st, 2013, 01:06 PM   #3
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Thanks. I might lessen the angle of the new tube to bring the back up and give more support to the tube the shock is mounted on. So slug it with tube instead of solid? I dont see why not. There will be some form of hoop between the two shock tubes ill call them. Haha. I tested the shocks like that and they felt softer but i think on the highest preload setting (if thats what its called) should stiffen it up a bit. Thats alittle more than 3"s in the picture as well so the shock angle will be alittle less.
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Old April 2nd, 2013, 10:04 AM   #4
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Originally Posted by mikef View Post
Thanks. I might lessen the angle of the new tube to bring the back up and give more support to the tube the shock is mounted on. So slug it with tube instead of solid? I dont see why not. There will be some form of hoop between the two shock tubes ill call them. Haha. I tested the shocks like that and they felt softer but i think on the highest preload setting (if thats what its called) should stiffen it up a bit. Thats alittle more than 3"s in the picture as well so the shock angle will be alittle less.
I think you need to learn a little bit more about shocks/springs if you think adding more preload will stiffen the ride.
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Old April 2nd, 2013, 07:57 PM   #5
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Your probably right. I know shit about shocks and alot of other things. Thats why i ask. Im going to mock it up and see how it feels. May need to relocate them and get so shorter ones. Maybe some air shocks off a different bike.
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Old April 2nd, 2013, 09:44 PM   #6
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Preload sets ride height and suspension sag...that's it, it has nothing to do with how stiff the ride is
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Old April 2nd, 2013, 09:56 PM   #7
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Yea i googled it haha. I figured it was a ride height thing at first but i measured, adjusted and re- measured and it was pretty much the same. Wonder if the springs off one of my 750's would be stiffer, hopefully not longer. Ill need to measure.
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Old April 8th, 2013, 06:53 PM   #8
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Ok, i took some measurements and ran to the storage unit to measure my parts gs750. Swingarm is alittle over 2" longer and a tad wider. Axle and pivot bolt are the same diameter. Pulled it off, brought it home and pit it on the 550. The shock mounts on the swing arm are different on the two models, also the 750 shocks are longer.

I was thinking, since im redoing the top frame where ill sit, ill just relocate the shockounts. would it be a bad idea to mount them through the tube/frame? In the above pictures they are mounted through the rear gusset. That area is getting slugged and a rear hoop added. The frame is roughly 1 1/8" and the stock upper ahock mount is around 3/4". Is that to much material taken out? I think the 750 shocks will be good at that angle and im sure i can tune them if needed.
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Old April 8th, 2013, 07:51 PM   #9
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Ive got some pictures but cant post em up until im on a computer
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Old April 13th, 2013, 01:50 PM   #10
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changed it up a bit, the kinked pipe is my new idea. i think i can heat and bent the factory tube to a shape the will work. maybe.


how im thinking of doing the shocks


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