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built my own swingarm

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posplayr said:
http://cgi.ebay.com/ebaymotors/Yama...hash=item390021572240&_trksid=p4506.m20.l1116

ITEM DESCRIPTION:
Yamaha XS 650 Stock length and Braced Swing Arm for Drum and Disc Brake applications: Up for auction is the Swing arm shown in this auction. We have added an under-brace with 6 attachment points to this swingarm. The U-bend tubing as well as the attachment arms are made of DOM steel with a wall thickness of .090. The U-bend tube is 1-inch OD. This entire process is done in our welding jig as well as the addition of the under brace assy. This model is available for a drum or disc rear brake application. ​
Click to expand...


Thats a good looking swinger. Its along the lines I have in mind for my 1982 GS750. I plan to relocate shock mounts as well as use a standard eye to eye style shock. Ill be running an over brace that will also act as a debris guard. This way I can widen it to run a 4" rim/tire combo which has been loads easier to find than a 2.75 rim. And thats not a bad price.


Seems i know the seller from another forum as well. Joes a good guy. Ill have to ask him if hes doing any GS stuff.
 
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wheel misalignment will upset ride geometry. more importantly, a misaligned sprocket will pull the wheel out of alignment and wear your drive train out.
 
I would have that swing arm magnafluxed after I used it. I have built many recumbent bike with rear suspensions. The cross bracing adds a helluva lot of strength and wide diameter thing wall is better than small diameter thick wall. My bike was tested at Canondale Bicycle Corporation and they were astonished at what I achieved out of thin tube steal. My bike only weighted 1 half pound more than their aluminum recumbent. They gave me 10 sets of disc brakes and boxes of parts to help me with my home made projects.

That being said, that swing arm looks frail. I would try again with larger tube diameters and cross bracing. It is fun fabricating and the fact that you are doing this is a plus in my book. That Kawasaki had a lot of cross bracing and it looks great. If the welds are right and he used the right materials I would bet that swing arm functions fine. Endeavor to persevere. Why not?
 
suzuki gs1100e swing arms are aluminum,,you can not magnaflux aluminum
 
when correctly done,a sleeve is inserted in the swing arm where it is cut,so that when it is welded the swing arm is actually stronger then before
 
I built my own swingarm and it appears to be stuck. Yeah I know choppers kill and all.
Brace that arm up and test it. Check for stress cracks and if they appear try again.
 
to get back to the OP's dilemma, add some well thought out bracing, install, and go enjoy the ride. people have done far worse than you have. you have a good starting point just needs some tweaking
 
All the " flippin" used arms in the world and you cannot find an existing arm from a proven manufacturing company? Primary operating systems ( chassis, brakes, suspension ) should not be lightly "played around" with. I appreciate your pioneering mentality, I really do, but we're talking serious malfuction here with the arm twisting or folding in a corner. I had two Kaw Z-1's, I can tell you all about highs speed and chassis flex. Hell, the 82 Katana chassis was insufficiant which is why everyone blabs on and on about gusseting and bracing the thing and that was " technologically" advanced for it's time. At the very least, laterally brace and gusset the arm. Please?
streetfighters
 
In the words of Tony Foale:
"There are a number of so-called "braced" swing arms on the market, but sad to say, many of them are of no more than cosmetic benefit. A lot of the flexibility in a swing arm is due to twist of the pivot tube, and hence those arms that only feature bits of added tube along the sides are not going to help much. The final link in the chain that is responsible for holding the wheels in line is of course the front forks. Regular readers will know my views on these abominations, but if you must use them, they can be improved. If money is no object, go out and buy top quality replacement units with large stanchion diameters and a large wheel spindle. If you are stuck with your originals then fit a brace above the wheel, but get a good quality one or don't bother. Like alternative swing-arms there are many ineffective ones on the market, make sure that it is rigid and equally important it must be accurately made or it may distort the fork alignment and prevent free movement of the sliders. If you have the facilities then changing from the usual 15 or 17mm. diameter wheel spindle to a more rigid 20mm. one (like those on some Italian machines) can be quite effective."
 
What ever became of the swingarm project Nasty? How about an update?
 
Well Ed,

The naysayers planted too many seeds of doubt in my mind & rather than brace the arm & use it, I went with a Bandit swinger of known quality.
Do I regret it? Sure I do but felt it just wasn't worth taking a chance. If I hadn't had all the negative comments I would have installed it & at least tried to see if it would work. I'm not blaming anyone, it is what it is.

Paul
 
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