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Author Topic: Ever see a chopper with a leaf spring rear end? (XS650)  (Read 825 times)

Offline ChopperCharles

  • Posts: 59
    • Modified Motorcycles by Chopper Charles
I was digging through old photos, and found this bike from my 2012 trip to Charleston, SC. I've never seen anything quite like it, and except for the fact it's an XS650, I really dig it!  I love unique chops, and this is visually stunning (at least to me). I wonder how it handles...


Charles.

Offline ChopperCharles

  • Posts: 59
    • Modified Motorcycles by Chopper Charles
Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #1 on: Aug 10, 2017, 13:58:27 »
Here's a couple more.


Charles.

Offline Redbird

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Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #2 on: Aug 10, 2017, 16:39:59 »
To me it looks "Hodge Podge" with the modern forks.
I would've followed the theme up front with a leaf sprung fork.
Something like this...
When you are Dead, you don't know that you are Dead. It is difficult only for Others.

It is the same when you are Stupid.

Offline stroker crazy

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Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #3 on: Aug 10, 2017, 17:58:56 »
I wonder how it handles...

Probably OK in a straight line Ö until you hit a bump!

Crazy
ďRide like the WindĒ W.H.

Offline cxman

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Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #4 on: Aug 10, 2017, 20:17:54 »
charles the geometry of the rear hoop and the leaf spring does not allow the swing arm to move

its a hardtail very unusually done

you can compress the leaf spring in direct compression it would have to break to compress

but its neat
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline crazypj

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  • Split personality, I fake being smart
Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #5 on: Aug 10, 2017, 22:35:53 »
Isn't the spring mounted to te frame? If so, it will move but without any form of damping (other than leaf friction) it would be very ....interesting?
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline ChopperCharles

  • Posts: 59
    • Modified Motorcycles by Chopper Charles
Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #6 on: Aug 11, 2017, 03:57:47 »
Spring is mounted to the frame, not the swingarm. If you look, you can see the spring mounted to a piece of metal that takes a sharp turn towards the front of the bike. The leaf itself is attached to that piece of metal, and to the upper mount above the fender. It was definitely not a hard tail, it appears to be an operational suspension.


Charles.

Offline ChopperCharles

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    • Modified Motorcycles by Chopper Charles
Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #7 on: Aug 11, 2017, 04:00:05 »
Also, if you look at the two photos that show the spring up close, you can see a bolt that is contacting that bent area. I'm wondering if that bolt is to adjust the ride height. It's not really doing anything else, sitting there...

Charles.

Offline cxman

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Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #8 on: Aug 11, 2017, 09:08:25 »
it will apply way more compression than forward arc

the arc of travel is way off
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline crazypj

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Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #9 on: Aug 11, 2017, 11:35:59 »
Yep, it's weird enough to get talked about. Pretty sure the operating rods will break as suspension operation is going to try and bend them. Should have had pivots on swing arm so they can change position as suspension moves. As is, suspension movement is trying to straighten spring (push upwards) rather than 'bend' it as in normal operation (I know I didn't explain that very well  :-[ )
 One thing that is very noticeable, the cheap pods are distorted because they cant flow enough so get 'compressed' by atmospheric pressure
« Last Edit: Aug 11, 2017, 11:39:08 by crazypj »
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline pacomotorstuff

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Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #10 on: Aug 14, 2017, 18:45:06 »
Indian and a couple of others used leaf spring rear suspension around 1912 - 1914.
The springs were basically parallel to the ground, like the quarter elliptic car springs of the day.  Google 1914 Indian and you'll probably see a photo. 
I don't have a clue as to how well (or not) the spring on the bike in your photos works or how it is damped.
Indian also used leaf springs for the front suspension.  My Dad's '39 Indian four had a trailing link leaf spring girder fork and except for limited wheel travel and the fact that the friction shock provided the same damping on compression and rebound (not your optimum set up), worked well enough for all that.
Pat

Offline VonYinzer

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Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #11 on: Aug 14, 2017, 19:29:08 »
Indian and a couple of others used leaf spring rear suspension around 1912 - 1914.
The springs were basically parallel to the ground, like the quarter elliptic car springs of the day.  Google 1914 Indian and you'll probably see a photo. 
I don't have a clue as to how well (or not) the spring on the bike in your photos works or how it is damped.
Indian also used leaf springs for the front suspension.  My Dad's '39 Indian four had a trailing link leaf spring girder fork and except for limited wheel travel and the fact that the friction shock provided the same damping on compression and rebound (not your optimum set up), worked well enough for all that.
Pat

There ya go Pat.

Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline crazypj

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  • Split personality, I fake being smart
Re: Ever see a chopper with a leaf spring rear end? (XS650)
« Reply #12 on: Aug 14, 2017, 20:25:30 »
Surprisingly, Kawasaki tested leaf spring on it's MX bike (I forget when, 15~20 yrs ago?)
It put hell of a strain on frame though and several bikes broke in two (it is possible to go too far 'lghtening' the frame)
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0