Author Topic: Hand built CB550 cafe  (Read 1714 times)

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Offline MikeZ68

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Hand built CB550 cafe
« on: July 27, 2014, 05:43:27 PM »
Long time lerker, first time (substantive) poster

I bought a CB500 with the intent to make a cafe racer, but I wanted to make sure it had some character and detail that wasn't like anything else. My concept was to make a bike that didn't have any bolt-on stuff that most people are using, so instead I hand built most of the part with no more than a angle grinder, drill, and simple hand tools. I did use a welder and metal lathe but those are more out of necessity.

SO, stated with a standard barn find CB500.


I wanted to reuse as many things as possible too, in order to keep the original feel. I moved the rear foot peg tabs down on the frame. I'm 6'3" and just mounting rear sets on those make it a really tight ride for me.


I re-used the rear foot pegs and want to make some foot controls that would work with them so I made a rear mounted double fulcrum gear shift and a matching style brake. This took some creativity and machining on a lathe to make all the parts but it turned out surprisingly well and actually works really good.



The chain actually was a little too close so I recently have flipped the middle tabs opposite of each other and it works fine now.

I made handle bars and head light mounts next

I've cut them down to size now, and have mounted the hand controls, running the wires thru the bars like stock.

I then looped the frame from three different sections.



Then I started crafting the seat cowl. I made it from a bunch of triangles that required a whole lot of funky math.




I know it still needs some work, but like I said, all I have is hand tool, so I am going to have to hand planish the whole thing with just hammers and dollies.

I then worked on the exhaust. I started with what I think is an old school set of Jardine pipes and blended them to make a low clearance 4 into 2, then blended that into a single 2.5" pipe. Again, it needs finishing work.




I have since decided to go with a 550 motor, which I did a basic rebuild/refresh with just a hone and some rings. I also redid the wiring since the 500 and 550 electric plugs don't match, the handle bar wires were excessively long, and I added a reg/rec. combo and moved it all under the cowl.


I JUST got it to fire up and run after having it and working on it for almost 2 years now.
Thought I would just share the progress and hope that ya'll enjoy.
1972 CB500 w/ 550 motor

Offline riverfever

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Re: Hand built CB550 cafe
« Reply #1 on: July 27, 2014, 06:50:49 PM »
Welcome. Nice looking project. I like what you did with the seat and will be interested to see the end product.
http://forums.sohc4.net/index.php?topic=127186.0

"You wouldn't think that out here...a man could simply run clear...out of country but oh my...oh my...nothing but the light." -Ben Nichols

Offline Trad

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Re: Hand built CB550 cafe
« Reply #2 on: July 27, 2014, 07:05:40 PM »
Nice work. It has a cool rat rod vibe; Keep it up.
74 CB550 Build: NOS-GUTTED-OEMplus-HOLDTRUE
http://forums.sohc4.net/index.php/topic,130575.0.html

Offline Ravie

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Re: Hand built CB550 cafe
« Reply #3 on: July 27, 2014, 07:29:45 PM »
I'm jealous of those of you who can come up with work like this. I have simple tools, too...but one of those things isn't a welder, so I'm REALLY limited in the stuff I can do in my shop.

Very cool bike. Reminds me of the kind of thing you might see Burt Munro do. haha
1975 CB750K5 Rebuild in progress.
http://forums.sohc4.net/index.php?topic=139072.0

Offline MikeZ68

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Re: Hand built CB550 cafe
« Reply #4 on: October 05, 2015, 11:00:37 AM »
it has only taken slightly over a year to update this, but all the fabrication is done and is ready for the winter tear down and paint/powder coat of engine, frame, and all the little parts. I've had such a positive reaction to the raw steel look and have considered just leaving it like that. Who knows though, might change my mind and end up painting the tank and seat cowl this winter too.
1972 CB500 w/ 550 motor

Offline Kimosobey

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Re: Hand built CB550 cafe
« Reply #5 on: October 05, 2015, 11:30:38 AM »
Wow impressive build! Post some pictures after you get the engine painted
"Still in search of a bike"

Offline SOHC4 Cafe Racer Fan

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Re: Hand built CB550 cafe
« Reply #6 on: October 05, 2015, 11:39:04 AM »
Did you do the upholstery yourself, as well.  If so, very well done!
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline MikeZ68

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Re: Hand built CB550 cafe
« Reply #7 on: October 05, 2015, 02:13:24 PM »
I made the seat pan... and I started to try to sew a seat up but realized I have zero skills for that, so that is the one and only thing out sourced, well I had the wheels balanced also. 2 things.
1972 CB500 w/ 550 motor

Offline SOHC4 Cafe Racer Fan

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Re: Hand built CB550 cafe
« Reply #8 on: October 05, 2015, 02:37:59 PM »
I made the seat pan... and I started to try to sew a seat up but realized I have zero skills for that, so that is the one and only thing out sourced, well I had the wheels balanced also. 2 things.

And the crankcases, cylinder block and head forged, and the frame tubes bent, and the . . . . ;)

I get it, Mike. Great job on the fab work. Way beyond me.  ;D

I was curious about the control arms for the shifter and brake arm -- why you used plate vs. tube or bar? That plate is a wee bit close to the pipe so I wonder if it absorbs heat (even though the pipe is wrapped). 
« Last Edit: October 05, 2015, 02:40:08 PM by CB750 Cafe Racer Fan »
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline MikeZ68

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Re: Hand built CB550 cafe
« Reply #9 on: October 06, 2015, 05:36:05 AM »
Guess I don't totally understand the question... I don't thinks I've ever seen (aftermarket) control arms made from anything other than plate. Things like the kits you get from Dime City are just plate aluminum. 

The plates have a pipe pivot point that passed thru them and a rear mounted.(photo attached below)

And they don't get really warm at all. There is actually it a couple of inches of clearance behind them from the exhaust. With air flow over them, they don't heat up at all. 
1972 CB500 w/ 550 motor