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Author Topic: was a rupp roadster, now i dont know what to call it  (Read 13556 times)

Offline ridesolo

  • Posts: 1057
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Re: Rupp Roadster. I think I'm to big for this
« Reply #30 on: Sep 12, 2015, 22:31:05 »
Lookin' nice.  I wondered how much I was going to have to open up my brake hubs so they'll fit onto the wheels.  Will have to do it X2 as I'll be putting the front brake back on... still toying w/ the idea of doing a front disc, though.  They've got a nice little caliper over at Glenn's that's about right or I know there'd be one from the front of a smaller 4-wheeler available on eBay. 

What size sprocket do you have on the jack shaft?  Mine's got a 10 tooth, thinking about maybe changing to a 12 or maybe even 14 tooth.  I figure that little 4hp Tecumseh should be ok after the rebuild, but it's 45 years old and maybe if it's geared a little higher riders won't feel the need to have the thing running at such high RPMs... (yeah right!) 
“Fight on and fly on to the last drop of blood and the last drop of fuel, to the last beat of the heart.”
— Baron Manfred von Richthofen

Please check out:  http://www.VetTix.org

These are on a low simmer out in the shop:
'75 Honda CL360: http://www.dotheton.com/forum/index.php?topic=56547.0
'70 Rupp Roadster: http://www.dotheton.com/forum/index.php?topic=67459.0

Offline HURCO550

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Re: Rupp Roadster. I think I'm to big for this
« Reply #31 on: Sep 14, 2015, 10:21:02 »
Lookin' nice.  I wondered how much I was going to have to open up my brake hubs so they'll fit onto the wheels.  Will have to do it X2 as I'll be putting the front brake back on... still toying w/ the idea of doing a front disc, though.  They've got a nice little caliper over at Glenn's that's about right or I know there'd be one from the front of a smaller 4-wheeler available on eBay. 

What size sprocket do you have on the jack shaft?  Mine's got a 10 tooth, thinking about maybe changing to a 12 or maybe even 14 tooth.  I figure that little 4hp Tecumseh should be ok after the rebuild, but it's 45 years old and maybe if it's geared a little higher riders won't feel the need to have the thing running at such high RPMs... (yeah right!) 


I think I could assist in opening those up if you need, and there will also likely need to be more mounting holes added to fit your new wheels (of course you could get lucky and they be the same =)

I will have to count the teeth. Mine is set up for a 35 chain and I believe yours is a 40, so it wont be the same regardless. Mine did come with a 40 sprocket for the front too, and ill count and let you know. I may waterjet a #40 sprocket for the back to have a little stiffer setup =)
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
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
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

Offline ridesolo

  • Posts: 1057
  • "Illegitimi non carborundum"
Re: Rupp Roadster. I think I'm to big for this
« Reply #32 on: Sep 14, 2015, 16:30:41 »
I think I could assist in opening those up if you need, and there will also likely need to be more mounting holes added to fit your new wheels (of course you could get lucky and they be the same =)

I will have to count the teeth. Mine is set up for a 35 chain and I believe yours is a 40, so it wont be the same regardless. Mine did come with a 40 sprocket for the front too, and ill count and let you know. I may waterjet a #40 sprocket for the back to have a little stiffer setup =) 

The difference may be in the year because I just took the front wheel off and the brake drum off it and that drum just slides right onto the new wheel, pretty as you please.  I will have to put new holes into the drums to match up w/ the holes in the wheels, but that shouldn't be too difficult.

I was talking about the number of teeth on the front sprocket.  It looks like the thing has #35 chain but maybe I'm wrong.  The '70 was sort of an odd duck;  it has the new frame style but had 10" wheels so maybe they went to different chain when they went to the 12" wheel.
“Fight on and fly on to the last drop of blood and the last drop of fuel, to the last beat of the heart.”
— Baron Manfred von Richthofen

Please check out:  http://www.VetTix.org

These are on a low simmer out in the shop:
'75 Honda CL360: http://www.dotheton.com/forum/index.php?topic=56547.0
'70 Rupp Roadster: http://www.dotheton.com/forum/index.php?topic=67459.0

Offline HURCO550

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Re: Rupp Roadster. I think I'm to big for this
« Reply #33 on: Sep 16, 2015, 10:07:14 »
The difference may be in the year because I just took the front wheel off and the brake drum off it and that drum just slides right onto the new wheel, pretty as you please.  I will have to put new holes into the drums to match up w/ the holes in the wheels, but that shouldn't be too difficult.

I was talking about the number of teeth on the front sprocket.  It looks like the thing has #35 chain but maybe I'm wrong.  The '70 was sort of an odd duck;  it has the new frame style but had 10" wheels so maybe they went to different chain when they went to the 12" wheel.


sounds like you lucked out. The rear sprocket and drum that I got was some NOS manx cat or something like that, so I knew the odds of it fitting were slim lol

I was looking at yours when I was there the other day, and im pretty sure that your chain is heavier than a 35. I have a chunk of 35 sitting here if you wanna compare =)
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
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
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

Offline HURCO550

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Re: Rupp Roadster. I think I'm to big for this
« Reply #34 on: Jan 18, 2016, 14:13:23 »
So this now could have been 3 separate build threads, but oh well. Found a $75 complete mini bike on cl. Couldn't pass it up. Got it home, and after a few laps around the yard, my wife decided that I had bought her a new mini bike. Truth be told, seeing her on two wheels made me smile pretty hard, so it's hers now lol.


Didn't take me long to figure out that 2 h.p. isn't enough, so 6.5 should do the trick
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
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
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

Offline canyoncarver

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Re: Rupp Roadster. I think I'm to big for this
« Reply #35 on: Jan 18, 2016, 14:59:37 »
Big yes!!!
--
YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
The Shovelhead springer chopper
A bunch of KZ's...some Suzukis', and a disassembled CB550
--


Offline ridesolo

  • Posts: 1057
  • "Illegitimi non carborundum"
Re: Rupp Roadster. I think I'm to big for this
« Reply #37 on: Jan 18, 2016, 17:47:17 »
That looks like a good one.
“Fight on and fly on to the last drop of blood and the last drop of fuel, to the last beat of the heart.”
— Baron Manfred von Richthofen

Please check out:  http://www.VetTix.org

These are on a low simmer out in the shop:
'75 Honda CL360: http://www.dotheton.com/forum/index.php?topic=56547.0
'70 Rupp Roadster: http://www.dotheton.com/forum/index.php?topic=67459.0

Offline MotorbikeBruno

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Re: Rupp Roadster. I think I'm to big for this
« Reply #38 on: Jan 18, 2016, 18:18:25 »
So this now could have been 3 separate build threads, but oh well. Found a $75 complete mini bike on cl. Couldn't pass it up. Got it home, and after a few laps around the yard, my wife decided that I had bought her a new mini bike. Truth be told, seeing her on two wheels made me smile pretty hard, so it's hers now lol.


Didn't take me long to figure out that 2 h.p. isn't enough, so 6.5 should do the trick


That a boy! She looks quite happy on it! Nice score!

Offline HURCO550

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Re: Rupp Roadster. I think I'm to big for this
« Reply #39 on: Jan 18, 2016, 20:29:38 »
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
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
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot