Author Topic: CR750 replica for the street  (Read 75304 times)

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Offline SOHC4 Cafe Racer Fan

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Re: CR750 replica for the street
« Reply #175 on: February 25, 2016, 06:57:51 PM »
Yes, but my Nine Lives bike took about 5.
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)

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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 SOHC4 Cafe Racer Fan

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Re: CR750 replica for the street
« Reply #176 on: February 25, 2016, 07:06:17 PM »
Ok, here's an update (as of December 18, 2015).  After a long break, Vincent got his wiring sorted and working.  He also had some aluminum (tig) welding done.

He was in the middle of working on the shift linkage.  Then on to cables, oil lines and tail light design. 

The build is something special.  The attention to detail and refined, custom details have a real wow factor.  I'm still subscribed!
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 FunJimmy

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Re: CR750 replica for the street
« Reply #177 on: February 25, 2016, 08:00:34 PM »
Ok, here's an update (as of December 18, 2015).  After a long break, Vincent got his wiring sorted and working.  He also had some aluminum (tig) welding done.

He was in the middle of working on the shift linkage.  Then on to cables, oil lines and tail light design. 

The build is something special.  The attention to detail and refined, custom details have a real wow factor. I'm still subscribed!

Totally. Why wouldn't you be?
Me too.
You never see a motorcycle parked outside of a psychiatrist's office!

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Offline Vincent

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Re: CR750 replica for the street
« Reply #178 on: March 06, 2016, 08:08:40 PM »

Well, it’s been a long time since I’ve been here, and I’m sorry that I was not around to respond to people’s questions and comments. Most of the progress on the bike has been in small details, and I feel weird coming on the forum to talk about such little things. But here I am anyway. To talk about the little things.

First, thanks to Don for the prods. How does he manage to keep up with everybody’s projects?  He's probably written you about yours. He says he has a full-time job, but I don’t believe it.

To Garage Guy Chris: Sorry I’m a year late with this, but the rubber terminal covers are Honda part #  32411-230-000 from the 2012 GL1800.

To jruff5585: As Don said, the exhaust system is from Lord Moonpie. Really well-made, good-looking pipes, but I’ll have to get some baffles in there before I put the bike on the road.

To FunJimmy: Yeah, some of us might not make it to the end. I frequently taunt myself with the idea that by the time I finish the bike, I’ll be too old to ride the damn thing.

OK, here’s a few pictures.

When the bike came back from Takashi’s shop, it was set up with the shift pattern reversed, but I really didn’t want to go that way. I already switch between left shift and right shift when I go from my ’77 GL1000 to my ’70 Bonneville, and I didn’t want to add an uside-down pattern to the mix. To figure out what kind of piece would have to be added to the shift lever, I made a wooden sample that was easy to make and then fine tune with a file.



Once I got the shape that would provide the necessary clearance, I borrowed time on a milling machine, copied the piece in aluminum, and had it welded onto the shift lever.


Several years ago I broke my left leg really badly (nothing to do with motorcycles) and it left me with less range of motion in that ankle. It’s not a problem with a “standard” riding position, but in the rearset footpeg position of this bike, it’s awkward. I bought two shift levers, cut an inch off one and two inches off the other, and had the two inch piece welded to the longer lever, yielding a lever one inch longer that stock. This will make it easier to operate the lever without giving myself a cramp. I made a jig to hold the pieces and asked the welder to make a weld about ¾ of an inch wide because I thought it would be easier for me to blend the two pieces together. Using a hand file and sandpaper, I smoothed the joint and saved the peak that runs the length of the lever.







The welder also filled the mirror mount and clutch switch mount on the clutch perch. I smoothed it, and it’ll be powdercoated.


For some reason, the CR carbs come with an idle screw that points up under the gas tank. Maybe someone can tell me if there’s a way that it makes sense, but I don’t get it. I got a remote adjuster cable from Powerbarn, and it came with a wire loop that allows the knob to be positioned next to the carb bank. I thought the knob could be kept in a less obvious but still easily reachable spot, so I made an aluminum holder for it.
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I have an early start in the morning, so I’m stopping here. More pics soon.

Thanks for looking.

Vincent







Offline SOHC4 Cafe Racer Fan

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Re: CR750 replica for the street
« Reply #179 on: March 06, 2016, 09:13:46 PM »
Yes!!!!  Nice to hear from you Vincent, and to see some of your fine craftsmanship. 

The devil is in the details, and a lot of little things add up to substantial progress. 

I think GP shifters are great for track/racing (by allowing easier up shifts when leaned over), but they can be a real PITA when you change bikes from GP to regular.  I've ridden a few bikes with GP shifters.  One of my racer friends used to have all of his bikes on GP shift pattern so it wouldn't confuse him to go back and forth.

Your new hybrid shift arm looks pretty flawless -- you'd never guess it was pieced together.

Also a good call on baffles for the Lord Moonpie pipes.  David H. aka Doctor D has a set and they are ungodly loud without baffles.  You would not make it two miles in SoCal without getting pulled over and (possibly) impounded.
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 greenjeans

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Re: CR750 replica for the street
« Reply #180 on: March 29, 2016, 11:16:32 AM »
Truly one of my favorite build threads ever.  It's your fault that I'm accumulating parts for a similar build. 
Yep, I'm the kid that figured out how to put things back together...eventually.

Offline Vincent

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Re: CR750 replica for the street
« Reply #181 on: April 03, 2016, 09:31:18 PM »

Hey, greenjeans,

Thanks for the kind words. Where are you getting parts? What do you have? Are there pictures?

Vincent

Offline Vincent

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Re: CR750 replica for the street
« Reply #182 on: April 02, 2018, 11:37:40 AM »
Deep breath. It's been a long, expensive, challenging time, and I'm finally close to wrapping up my project. I stopped posting about my slow and irregular progress for two reasons. One, I felt it was slow enough to be boring for anyone following it, and two, it always reminded me of just how long everything was taking - and that was a bit depressing. So now I actually have things to report, but I see that Photobucket has removed my photos and needs a paid subscription to reinstall them. Since this is the only place where I post pictures - and this bike is my only project - I'm hoping there's another way to post pictures without having to pay a fee. I know I'm speaking to a forum full of resourceful people, so if anyone has advice about this, I'd be happy to take it.

Thanks.

Vincent

Offline PeWe

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Re: CR750 replica for the street
« Reply #183 on: April 02, 2018, 12:14:08 PM »
I see your photos with my browser. I have installed the recommended add-in to see Photobucket photos.
http://forums.sohc4.net/index.php/topic,168102.msg1964918.html#msg1964918
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Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Godffery

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Re: CR750 replica for the street
« Reply #184 on: April 02, 2018, 12:20:49 PM »
I see your photos with my browser. I have installed the recommended add-in to see Photobucket photos.
http://forums.sohc4.net/index.php/topic,168102.msg1964918.html#msg1964918

 Thanks for the tip PeWe, I also had issues with that! (Done & fixed)  ;D

Offline SOHC4 Cafe Racer Fan

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Re: CR750 replica for the street
« Reply #185 on: April 02, 2018, 12:29:52 PM »
Glad to see you back, Vincent.
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 scunny

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Re: CR750 replica for the street
« Reply #186 on: April 02, 2018, 10:42:58 PM »
Nice job Vincent, I'm still watching.
Pewe, cheers for that 2nd FF fix, worked a treat.
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Offline Vincent

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Re: CR750 replica for the street
« Reply #187 on: April 03, 2018, 10:33:10 AM »
Hey, thanks, PeWe! I used    https://addons.mozilla.org/en-US/firefox/addon/photobucket-fixer/    and now I can see the pics again! If anyone's interested in seeing them, the fix takes about two seconds. Now I'm psyched to post more, but I have another question. Should I post more pictures from Photobucket, or have they made it so that new pictures are immune to the fix? And I apologize for making this sound like a computer forum. I'll get back to motorcycles right away!

Vincent



Offline zeffcat

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Re: CR750 replica for the street
« Reply #188 on: April 03, 2018, 11:42:28 AM »
Should I post more pictures from Photobucket, or have they made it so that new pictures are immune to the fix?

Stumbled across this build for the first time and all I can say is wow. Beautiful build. I'm amazed with how you make crafting seem so much more doable with your paper templates and such. Anyways, I use and would highly suggest imgur.com for hosting your photos. Its fairly simple to use and best of all its free, with significantly less ads than photobucket.
« Last Edit: April 06, 2018, 12:34:14 PM by zeffcat »
CB750 K8

Offline algophobe

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Re: CR750 replica for the street
« Reply #189 on: April 03, 2018, 11:04:53 PM »
silly question, but what is the function of the tubing that goes to the top/front on the gas tank? I see it on race bikes quite a bit. breather tube? whats advantage of having it on top.. older design tech?
« Last Edit: April 03, 2018, 11:14:16 PM by algophobe »
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Offline SOHC4 Cafe Racer Fan

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Re: CR750 replica for the street
« Reply #190 on: April 04, 2018, 08:07:43 AM »
silly question, but what is the function of the tubing that goes to the top/front on the gas tank? I see it on race bikes quite a bit. breather tube? whats advantage of having it on top.. older design tech?

I believe it serves 2 purposes: (1) relieve pressure (with temperature changes); and (2) direct any gasoline (due to splashing and/or g-force from turns) away from the rider, whereas a conventional valved cap may allow some gas to be expelled onto the tank and rider under such forces. 
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 dunc

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Re: CR750 replica for the street
« Reply #191 on: April 04, 2018, 10:34:05 PM »

Switches for lights/horn and starter/kill:




Anyone know which switches these are?
it's amateur hour somewhere.

Offline Vincent

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Re: CR750 replica for the street
« Reply #192 on: April 04, 2018, 10:44:07 PM »

Hi Dunc,

They're Pingel switches. If I were buying switches today, I'd buy them from Revival in Austin, Texas. Small, round housing, and very neat.

Vincent

Offline Vincent

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Re: CR750 replica for the street
« Reply #193 on: April 04, 2018, 11:10:58 PM »

OK, I've been preparing pictures to post (took zeffcat's suggestion about imgur), but now it's late and I'm tired. I'll just test it with a couple tonight, and post a bunch tomorrow.
My buddy Joe milled some aluminum "L" for me, and I used a dime, a scribe, a file, and some sandpaper to make parts to replace the one-size-fits-all brackets that come with the CR carbs.

Vincent












Offline 02z06dave

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Re: CR750 replica for the street
« Reply #194 on: April 05, 2018, 04:18:00 PM »
You can just add pictures as attachments here. No need to worry about a hosting service

Offline Vincent

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Re: CR750 replica for the street
« Reply #195 on: April 05, 2018, 06:37:59 PM »

02z06dave, that would be great, but I'm not seeing how to do it.

Offline 02z06dave

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Re: CR750 replica for the street
« Reply #196 on: April 05, 2018, 08:11:46 PM »

02z06dave, that would be great, but I'm not seeing how to do it.

When you reply click the + next to attachments and other options. Then choose file and add your picture. Click more attachments to add more pictures.

Offline Vincent

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Re: CR750 replica for the street
« Reply #197 on: April 05, 2018, 10:49:16 PM »

I tried to make the neatest wire harness that I could, and I wanted to contain the handlebar switch wiring as far as possible up to the bars, so I made one holder for each side. It seemed to work with a paper dummy, so I made them from aluminum, found grommets that would be a kind of snug fit around the wires, and attached the clips to the triple clamp bolts.





I figured out how to have the brake switch wires sneak out from the wiring sheath, and then made that happen right where the grommet held the sheath.




Offline Vincent

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Re: CR750 replica for the street
« Reply #198 on: April 05, 2018, 10:55:08 PM »

Another way of making a neat wiring harness was to combine things wherever I could. I made all the instrument bulb wires come down to a common switched hot and a common ground.


Offline Vincent

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Re: CR750 replica for the street
« Reply #199 on: April 05, 2018, 11:22:43 PM »

From the first time I thought about doing this bike, I knew I had to have a custom tail light, and it had to be something that specifically fit this bike and only this bike. Solter Plastics in Los Angeles sells clear red acrylic, and I bought a small piece. I put the seat on a piece of balsa wood, traced the outside of the back of the seat onto the wood, drew another curve about 3/16 inside of that curve to account for the thickness of the seat and the acrylic, and cut a pattern from the wood.


I cut a strip of acrylic, heated it with a heat gun, and held it on the pattern while it cooled.


OK, it's almost 11:30 and I need to go to bed. See you tomorrow.

Vincent