swingarms.com

79MKII wrote:

Here is the stock length unit from american classix - it's going for $695 and looks pretty good:

Klasmo - Very pretty arm, but it is box steel... hence the lower price. I can't help to start the realization that we spend way to much on what is still an old bike, but if I'm
doing it... Aluminum :woohoo:

Not trying to stir the pot, just adding an option. Since I'm such a cheap bastich I'm going with a stock late-model sport bike swing-arm and I've got a machinist/welder (with mad skills) who is going to fit and brace it. I've picked up a few arms over the past few seasons and I'll be checking to see what will work best. I've got a couple different ZX7 arms, an FZR1000 arm, a TL1000S arm, and a couple different gixxer arms.
The good: they were all dirt cheap.
The bad: at least one of the arms widens-out too abruptly to fit w/o modifying something. Meaning: at the frame/arm pivot although the arm is narrow enough to fit as the arm goes back to the rear axle it widens out at such a drastic angle that it contacts the frame...we'll see, eh?

Anywho, just a couple more '2 cents' for the collective coffer.

-KR

Bad Kaw wrote:

...I'm going with a stock late-model sport bike swing-arm and I've got a machinist/welder (with mad skills) who is going to fit and brace it. ...
-KR

Very good idea. I often thought about that too. I've seen a lot of conversions, with a Kaw ZRX rear end for example, and they work great. That way you don't have to worry about the rear wheel spacers, brake set up, or anything. It all fits perfectly already. If I knew someone to machine the pivot area I would have gone that route too.

Now, on the other hand, I had great luck with a V&H swingarm in the early 90's. I have come to find out since that they were really CalFab arms. I bought a 3" longer aluminum arm brand new and it was 100% bolt on. Every little part from my stock set up worked - chain guard, rear axle and adjusters, rear brake set up, etc... I only had to add a longer chain. It would take about a 150mm wide tire, but that was about it.

That's where the JMC arm would be nice - no real mods necessary. But, you're going to pay more for that compared to converting a newer sportbike set up. Either way, the end result will be awesome!

engrish?i tought you was canadish!

hahahahahahahahah.... You kill me man! :laugh: :laugh:

Question, has anyone truly tried designing/fabricating their own swingarm?

And I don't mean some half ass redneck revision...
Hmmm, I wonder how hard that would truly be....

Me thing the pivot tube would be the most difficult getting true & on the money... Not sure whats on the inside....
Again hmmm, may need to investigate....

OMR

This one I built worked ok for a while till it got wet (didnt have room in my trailer)then after a couple of times it warped, throwing off my set-up. next time will be green 2x4's

Hey that's plummens drag bike... :laugh:

The frame flex must be a bitch!

OMR

Heard the brakes feel 'wooden'...

i built my own swingarm out of 4130 chro-moly(i also built my own tubing bender that i used to bend the tubing).i have about 1500 miles on it and am very satisfied with it.it is extended 2" over stock and uses a 2000 r1 wheel and brake.i built and machined every piece of the swingarm including the pivot.it is amazing what you can dream up when you have the skill and equipment to get the job done.i also converted from 630 to 520 non o-ring chain while doing the conversion,and also fabricated my own offset countershaft sprocket.quite a difference in handling with a rigid arm and a 200mm tire.here is the rightside,after a poker run in the rain where i fried the coils.thus the trailer shot.

and here is the left side.

here is one of it cleaned up.

Can't look at that w/o applauding...wooooo-hooooo! Love that one, man; exceptional work.
-KR

Nice!

At first glance, I thought to myself, what a biatch that must be to change the chain for it goes through the swing arm tubing then in looking at it closer (top of rear sprocket) you can see the master clip, not a rivet type master link.

Whew.... :laugh:

OMR