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Author Topic: was a rupp roadster, now i dont know what to call it  (Read 27338 times)

Offline jag767

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Re: was a rupp roadster, now i dont know what to call it
« Reply #120 on: Jul 30, 2017, 21:54:42 »
Great project ever. I feel like it needs a big 2 stroke in there, like a rd 350 if it can fit  :P  ;D

Offline XS750AU

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Re: was a rupp roadster, now i dont know what to call it
« Reply #121 on: Jul 30, 2017, 23:53:57 »
Also dimpled the main frame. Looks good and adds rigidity. Win win


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Absolutely fantastic original work.
The biggest single improvement you could make for rigidity in the structure is to close in the side plates. By that I mean weld a continuous metal strip down the top of the frame bridging from side plate to side plate. You obviously have access to CAD/CAM facilities if you could get access to some CAE modelling it would confirm that a closed in box section is the most efficient section at resisting bending.
Keep up the great work.
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Offline Hurco550

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Re: was a rupp roadster, now i dont know what to call it
« Reply #122 on: Jul 31, 2017, 11:59:04 »
Absolutely fantastic original work.
The biggest single improvement you could make for rigidity in the structure is to close in the side plates. By that I mean weld a continuous metal strip down the top of the frame bridging from side plate to side plate. You obviously have access to CAD/CAM facilities if you could get access to some CAE modelling it would confirm that a closed in box section is the most efficient section at resisting bending.
Keep up the great work.
Thanks man! I have thought about something similar,  but instead of full sheets, maybe some "x" braces in between the vertical ones. Just tacked up though this thing feels surprisingly rigid. I'll see how much more so once it's really welded up and I can do some redneck flex tests.

For now she is safe and sound in the living room. We'll see how well my wife likes motorcycle decoration when she gets home.



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« Last Edit: Jul 31, 2017, 12:17:46 by HURCO550 »
"If you want safety and sanity don't mess around with choppers to begin with and don't come crying to me for recommending something that broke down the line. You're going to be the "builder" so use your own judgment and build to you own personal levels of safety and sanity." - Chopper Handbook
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline SONIC.

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Re: was a rupp roadster, now i dont know what to call it
« Reply #123 on: Jul 31, 2017, 14:00:41 »
Yes sir.
Nicely done.


Offline Maritime

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Re: was a rupp roadster, now i dont know what to call it
« Reply #125 on: Jul 31, 2017, 14:38:04 »
All kinds of rad!
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
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Offline JSJamboree

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Re: was a rupp roadster, now i dont know what to call it
« Reply #126 on: Jul 31, 2017, 15:46:24 »
So whats left of the rupp? The forks?

Offline Hurco550

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Re: was a rupp roadster, now i dont know what to call it
« Reply #127 on: Jul 31, 2017, 16:02:14 »
So whats left of the rupp? The forks?
Ha, not even that. I'll have to look, I think maybe the wheel base and rake share dimensions

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"If you want safety and sanity don't mess around with choppers to begin with and don't come crying to me for recommending something that broke down the line. You're going to be the "builder" so use your own judgment and build to you own personal levels of safety and sanity." - Chopper Handbook
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline Hurco550

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Re: was a rupp roadster, now i dont know what to call it
« Reply #128 on: Jul 31, 2017, 16:02:58 »
All kinds of rad!
Fan-freaking-tastic
Yes sir.
Nicely done.
Thanks!!

Sent from my SM-G920V using Tapatalk

"If you want safety and sanity don't mess around with choppers to begin with and don't come crying to me for recommending something that broke down the line. You're going to be the "builder" so use your own judgment and build to you own personal levels of safety and sanity." - Chopper Handbook
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline JSJamboree

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Re: was a rupp roadster, now i dont know what to call it
« Reply #129 on: Jul 31, 2017, 16:07:32 »
Looked back and realized that the roadster wasn't like the blackwidow or scrambler, yeah thats totally different.  There is alot of power left in that motor to free up, almost to much.  Pull the governor, get a billet flywheel (the stock one will explode at high RPM), tighter springs, cone filter, exhaust, and throw a mikuni on there so its manageable.  The stock carb turns into an on/off switch at this point and its almost unrideable.  I need to get mine out of the shed