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Author Topic: The unicycle, xr600/cb500t bratard  (Read 7020 times)

Offline HURCO550

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The unicycle, xr600/cb500t bratard
« on: Jun 11, 2015, 23:54:22 »
I decided that i didnt have enough projects going on, and since i never finish any, it must be time to start another one. Thanks to my buddy ridesolo, i havent been able to get the idea of a large cc thumper motor in an old cb frame outta my head. Its been done before, and it has gone around on this site and some others. There is a lady in Australia that shoe horned a xr600 motor into a cb360. I have been pretty consumed by the idea, and actively searching for a donor motor. I found one in Maryland on CL, and one of the great DTT members is gonna bring it up to me at Mid Ohio this summer. I was planning on putting the engine in my cb550 project, but after some looking and thinking i decided that its far from the "ideal" frame. I have an old cb500t frame from a part out, that if i can procure a title, will be much better suited because of using a top motor mount and having a single down tube frame.

I am going to rob some of the parts that i have already rebuilt and bought off of the 550 project and put them on the 500t frame, the biggest being the front end (i think it will swap out) I have lost all ambition on that project, just to have another cb550 four like many others =P (not knocking the bike, or you if you have one, its just not what im diggin right now)

As stated in the title, it will be a brat type build, (called it a bratard to pay homage the the ever wise xb33bsa) =) fairly flat seat, if i try to motorcross it, the rear tire may bump the fender, and it will be best suited running around town, pulling wheelies (hence the name unicycle) and having enough torque to pull out a stump. I am not building the bike to drag knees and push to the handling limit. I know many of you dont like this style, and think it is not functional. If you are one of these ppl, ive read many of your other posts harping on the same thing over and over again, so i pretty much got it. That said, i dont wanna die right away, so ima shy away from firestone champion deluxe tires, and it will have a fork brace ect ect. I am not much for drinking and riding, but for all intents and purposes, this will be a bar hopper type bike, and will be as well suited for the road or better than a hardtail bobber.

anyways, had to get the gt250 off of the table to make room for the frame.


Here she is, the blank canvas for my thumper=)




And here is the lump. I am getting the engine, carbs, some ignition stuff, and the exhaust (which will probably end up getting hacked up) it is all there supposedly, less the cam. It had the dreaded early xr600 oiling problem in the head and wiped the cam bearings. He bought another used head for it, but has not ever put it back together.






This is very close to how i want the style of the bike to end up. not a copy but close. As stated above, i will not be having the gripless ballon tires and there will be other need equipment ( fork brace and probably turn signals) but i can dig the clean look of this one.

« Last Edit: Jun 12, 2015, 11:22:01 by hurco550 »
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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 JustinLonghorn

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Re: The unicycle, xr600/cb500t bratard
« Reply #1 on: Jun 12, 2015, 09:22:19 »
Everything in those pictures?
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline HURCO550

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Re: The unicycle, xr600/cb500t bratard
« Reply #2 on: Jun 12, 2015, 09:52:08 »
Everything in those pictures?
Everything engine related, yes
« Last Edit: Jun 12, 2015, 10:40:41 by hurco550 »
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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 JustinLonghorn

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Re: The unicycle, xr600/cb500t bratard
« Reply #3 on: Jun 12, 2015, 10:39:49 »
Cool. I'm on board.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline HURCO550

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  • Posts: 2569
  • Life is short. Smile while you still have teeth.
Re: The unicycle, xr600/cb500t bratard
« Reply #4 on: Jun 12, 2015, 22:31:44 »
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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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  • Life is short. Smile while you still have teeth.
Re: The unicycle, xr600/cb500t bratard
« Reply #5 on: Jun 12, 2015, 22:36:12 »
Gotta love four tens and a 3 day weekend.

As of a bit ago, my cb550 project now looks like this


500t frame got the tapered neck bearing treatment from all balls


And just like magic, I have a roller again. Cb550 front end fit right on (as I hoped it would)



Gotta tell ya, I'm getting pretty jazzed about this bike
« Last Edit: Jun 12, 2015, 22:38:20 by hurco550 »
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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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  • Posts: 2569
  • Life is short. Smile while you still have teeth.
Re: The unicycle, xr600/cb500t bratard
« Reply #6 on: Jun 13, 2015, 23:23:51 »
Spent some time this evening doing a little "de-tabbing". Pretty much just removed the seat hinge mounts, seat lock and passenger peg mounts (this will be a one up machine). Don't want to cut more away til I'm sure of what I want gone. I just sat this seat on it, and I'm not sure it's what I wanna go with.





Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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

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  • "Illegitimi non carborundum"
Re: The unicycle, xr600/cb500t bratard
« Reply #7 on: Jun 14, 2015, 17:04:05 »
I decided that i didnt have enough projects going on, and since i never finish any, it must be time to start another one. Thanks to my buddy ridesolo, i havent been able to get the idea of a large cc thumper motor in an old cb frame outta my head.   

Hmmm so, somehow I'm going to get the blame for this?   ;D

Looking good buddy.  Once I find the XR500 (or 600) lump for the CL360 Ninja it may become a "CL500 Ninja".   :o 
“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: The unicycle, xr600/cb500t bratard
« Reply #8 on: Jun 15, 2015, 10:37:46 »

Hmmm so, somehow I'm going to get the blame for this?   ;D
Looking good buddy.  Once I find the XR500 (or 600) lump for the CL360 Ninja it may become a "CL500 Ninja".   :o 


Haha yes. When you were first telling me about that 350/600 swap that girl did I remember thinking "why would you ever wanna trade 2 cylinders for 1" haha now I know why =) So yes I blame you =) nothing wrong with that though.

IDK I guess this one will be an cb600S lol
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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: 1000
  • "Illegitimi non carborundum"
Re: The unicycle, xr600/cb500t bratard
« Reply #9 on: Jun 15, 2015, 14:35:53 »
I think if we can both pull it off we'll have a nice comparison of styles; yours the Tracker/Brat style w/ flat seat, upright seating, and handlebars and mine w/ cafe seat, rear sets, & clipons.  It would be a lot of fun to compare the different feel of the two bikes w/ essentially the same engine.
“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: The unicycle, xr600/cb500t bratard
« Reply #10 on: Jun 15, 2015, 14:42:36 »
I think if we can both pull it off we'll have a nice comparison of styles; yours the Tracker/Brat style w/ flat seat, upright seating, and handlebars and mine w/ cafe seat, rear sets, & clipons.  It would be a lot of fun to compare the different feel of the two bikes w/ essentially the same engine.

Yep agreed. You just need to find an engine. With my luck youll find one at Mid-O that's running for less than what I paid for mine hahaha. It will be a neat comparison though
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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 xb33bsa

  • Posts: 7727
Re: The unicycle, xr600/cb500t bratard
« Reply #11 on: Jun 15, 2015, 14:46:13 »
the xr600 frame is on a different planet better construction than an old cb frame you would be so much better off modding the xr frame besides it has the oil innit as well

Offline HURCO550

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  • Posts: 2569
  • Life is short. Smile while you still have teeth.
Re: The unicycle, xr600/cb500t bratard
« Reply #12 on: Jun 15, 2015, 14:57:20 »
the xr600 frame is on a different planet better construction than an old cb frame you would be so much better off modding the xr frame besides it has the oil innit as well

True, I will stiffen it up some. I know the girl that put one in her 350 frame hasn't had any issue with the frame its self. The other thing is I don't have a xr600 frame, and that's not really what im going for. I like the idea of a vintage bike with a high torque motor in it, not a speed machine, but a neat old round town thumper. I don't want an enduro (which tends to do both dirt and road bad, not good). I would rather start with a streetbike and keep it on the street.... well hopefully... se signature below. And the oil tank is no big deal, ill just fab one up and throw it under the seat =)
Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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: 1000
  • "Illegitimi non carborundum"
Re: The unicycle, xr600/cb500t bratard
« Reply #13 on: Jun 15, 2015, 15:31:45 »
the xr600 frame is on a different planet better construction than an old cb frame you would be so much better off modding the xr frame besides it has the oil innit as well 

The DTTREOEKTM speaks, imagine that.
“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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  • Life is short. Smile while you still have teeth.
Re: The unicycle, xr600/cb500t bratard
« Reply #14 on: Jun 16, 2015, 22:45:47 »
Did a little more cutting and smoothing on the un needed frame tabs, and mounted the headlight. Still not sure on the seat. Kinda not diggin the "cafe bump" look with the super bike bars on this one... hmmm

Keep er' Between The Ditches!!!

1984 VF1000F Interceptor:http://www.dotheton.com/forum/index.php?topic=71539.msg842137#msg842137
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