Author Topic: 1978 CB750 Cafe conversion Front end [re-assembly]  (Read 9582 times)

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Offline SKTP

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Re: 1978 CB750 Front end conversion
« Reply #25 on: January 29, 2018, 03:10:52 PM »
Don, did you notice any difference in frame flex after you put in the Frame kit?
1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
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Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750 Front end conversion
« Reply #26 on: January 29, 2018, 03:22:15 PM »
Don, did you notice any difference in frame flex after you put in the Frame kit?

No.  Some people believe that it actually makes the frame more rigid.
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 754

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Re: 1978 CB750 Front end conversion
« Reply #27 on: January 29, 2018, 07:25:47 PM »
Nice looking trees, how thick is the bottom.
 Re the frame kits  I have a guy working on them as we speak.
Maker of the WELDLESS 750 Frame Kit
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My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750 Front end conversion
« Reply #28 on: January 29, 2018, 09:56:02 PM »
Nice looking trees, how thick is the bottom.
 Re the frame kits  I have a guy working on them as we speak.

There you go. Straight from the source!
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 Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #29 on: January 30, 2018, 06:01:50 AM »
Nice looking trees, how thick is the bottom.
 Re the frame kits  I have a guy working on them as we speak.
You redo some, great :D  8) The Low triple is 45mm thik, but there is a recess to 35in middle section and stem.

For the Gordon Kit I'm in !

also design my own on spare time... :P (to weld)


But I prefer the clamping type til I'm not a welder ;) so GordonKit will be I think, or I will do mine...


« Last Edit: January 30, 2018, 06:23:56 AM by Rnobx67 »

Offline Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #30 on: January 30, 2018, 07:14:25 AM »
Don, did you notice any difference in frame flex after you put in the Frame kit?
Welded, or weld-less, I personally don't believe you could ride the difference with a hot rod 750 motor in it. There's just not enough ponies to push that frame's limits on the street.

calj737, I see on your avatar, You use motogadget did you have all the harness drawing with that ? what did you keep from original harness ?

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750 Front end conversion
« Reply #31 on: January 30, 2018, 07:24:17 AM »
Don, did you notice any difference in frame flex after you put in the Frame kit?
Welded, or weld-less, I personally don't believe you could ride the difference with a hot rod 750 motor in it. There's just not enough ponies to push that frame's limits on the street.

calj737, I see on your avatar, You use motogadget did you have all the harness drawing with that ? what did you keep from original harness ?

FYI - Cal has a deserved reputation on the forum as being somewhat of a wiring and Motogadget guru. 
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 Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #32 on: January 30, 2018, 11:34:49 AM »
I do use MotoG stuff on my bikes, plus many others I help with. And I have helped more than 100 folks remotely or in-person install these systems. I don't think that makes me a Guru, but it does mean I've done it quite a few times.  ;)

I used the stock harness only as a reference. My re-wires are completely from scratch since an M-Unit functions in reverse to the stock electrical system. I do adhere as closely as possible to the stock colors though for consistency, troubleshooting, and future ownership (so those who inherit these bikes can make some heads/tails from a custom harness).

If you plan to use an M-Unit and use the stock controls, there's a number of wires that have to be altered. Easiest for you to compile a detailed list of your controls, components, and brands so that I can help direct you accurately. If that's what you need?

What I plan is like you said start from scratch with entire new harness, think I will change the controls by new one or other bike, newer or juste one from the ZX6R. I will keep whatever works, like coils, acid battery, already bought new regulator cause old one grilled all my lights. If I can I would like to put everything new but sometimes $ could talk.

SO I will be very flatered to be helped with that. I could make my list and send it to your private message ;)

Offline Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #33 on: February 05, 2018, 06:29:47 AM »
It was too cold outside for going to the garage so I was trying some stuff to do in the appartment. What do you think ? I removed black background on side sigle tank and replace the chinese copy which wasn't fitted properly on the tank.
Also trying some pinstriping lines, my first ones.

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750 Front end conversion
« Reply #34 on: February 05, 2018, 08:24:37 AM »
I would keep the background black.  Cal is right. There needs to be some contrast between the letter and the surround or the letters look messy and undefined.
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 Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #35 on: February 08, 2018, 06:11:30 AM »
Removing the black background looks fine, but re-paint the letters in White. The contrast will make your stripes and letters standout better.
I would keep the background black.  Cal is right. There needs to be some contrast between the letter and the surround or the letters look messy and undefined.
But the letters are not like 69-76 tank. They are plan and "silver" plated, difficult to paint without wall to maintain paint inside the letter...
My goal was to add gold touch for matching with the front legs. chinese logos were good in term of coloring, I have an other idea, but plan it for later :)

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750 Front end conversion
« Reply #36 on: February 08, 2018, 07:22:41 AM »
Removing the black background looks fine, but re-paint the letters in White. The contrast will make your stripes and letters standout better.
I would keep the background black.  Cal is right. There needs to be some contrast between the letter and the surround or the letters look messy and undefined.
But the letters are not like 69-76 tank. They are plan and "silver" plated, difficult to paint without wall to maintain paint inside the letter...
My goal was to add gold touch for matching with the front legs. chinese logos were good in term of coloring, I have an other idea, but plan it for later :)

You can mask the individual letters OR use a Dupicolor paint pen Or (ghetto-style that won't last) use a Sharpie.
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 Bankerdanny

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Re: 1978 CB750 Front end conversion
« Reply #37 on: February 08, 2018, 09:01:11 AM »
Nice looking trees, how thick is the bottom.
 Re the frame kits  I have a guy working on them as we speak.

Good to hear. I am going to need one for my 750F. It's still sitting in my sister's garage, but I plan to move my 550 from the shop where it is stored now to a storage unit I rented recently and finally get the 750 up the shop so I can get it running and have it ready for Spring.
"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline nvr2old

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Re: 1978 CB750 Front end conversion
« Reply #38 on: February 08, 2018, 09:28:12 AM »
Looking at your tank emblems, to me they look so much better with the black background, if for no other reason then the screws in the O and the D..they stand out like a sore thumb, but with the background black, they disappear.  No need to mask the letters to paint.  Just spray the whole thing black, let it tack up a bit, then dip your rag tipped finger into a bit of acetone and wipe the letters clean.
'76 CB550F-'72 XL250-'82 MB5-'82 CX500 Turbo-'77 naked Goldwing-'75 CB400F cafe'-'79 Suzuki GS1000S..hey, it's a Wes Cooley..

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750 Front end conversion
« Reply #39 on: February 08, 2018, 01:58:34 PM »
No need to mask the letters to paint.  Just spray the whole thing black, let it tack up a bit, then dip your rag tipped finger into a bit of acetone and wipe the letters clean.

Excellent solution.
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 Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #40 on: February 13, 2018, 05:39:14 AM »
GSXR controls are tricky to wire to. Just so you know. I'm a huge fan of momentary push buttons for handlebars. There's plenty of inexpensive versions of those out there. You send me anything you want, or continue to post here. Matters not to me.  :)
What kind of factory switch is better ? I want to keep something normal, (with red for start, logos for lights....)

Offline Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #41 on: May 29, 2018, 07:45:18 AM »
I finally order my parts, with a m-unit, very weird all I'm ordering cost 666$  :o


Offline Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #42 on: May 29, 2018, 08:02:58 AM »
So for now mechanically, I removed the sprocket and release the chain, screws on the cover were seized and try with punch screwdriver and I almost #$%*ed the philips socket, but after putting release all and using a good manual screwdriver I was good.
I've also put the front end in place cause, finally my machinist Can't do me the job, so I send my drawings to other machinists, but I've no chance at all, no quote, not nothing...
Next will  be removed the motor,

What are you using for clean it and repaint it ?

Offline Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #43 on: October 16, 2023, 06:31:56 AM »
Progress report :)
unmounting

Offline Rnobx67

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Re: 1978 CB750 Front end conversion
« Reply #44 on: October 16, 2023, 06:50:14 AM »
And some paint applied:

Offline Rnobx67

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Re: 1978 CB750 Cafe conversion Front end [re-assembly]
« Reply #45 on: October 16, 2023, 08:04:13 AM »
going forward with assemblies, couldnt machined my top trees I've designed, so ended to order one at Cognito (OG). Since I've my daughter, don't work a lot on it, I give it to a shop to assemble it and put in order to work with my new CR Carbs. Soon at home to do the electric part, and custom some other parts.

Offline Don R

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Re: 1978 CB750 Cafe conversion Front end [re-assembly]
« Reply #46 on: October 16, 2023, 08:59:38 AM »
 It's good to see you back at it.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline Rnobx67

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Re: 1978 CB750 Cafe conversion Front end [re-assembly]
« Reply #47 on: October 17, 2023, 04:31:03 PM »
don't want to give up :P

Offline Gurp

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Re: 1978 CB750 Cafe conversion Front end [re-assembly]
« Reply #48 on: October 31, 2023, 08:05:36 AM »
Love a long term project.
Life gets in the way. But it's always good to keep on it even if it's slow progress.
slow Progress 74 cb550.

Poor boy chop 73 CB500 chop

Future project 77 Cb750 Amen Savior

Offline Rnobx67

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Re: 1978 CB750 Cafe conversion Front end [re-assembly]
« Reply #49 on: April 30, 2024, 07:38:29 PM »
Love a long term project.
Life gets in the way. But it's always good to keep on it even if it's slow progress.
Yes unfortunately don't have much time to put in it, neither a place...

Some back and forth during winter motogadget tiny cup brazed in to the light bucket, then fall down  :-\ , small parts as rear pegs done. original pin but put some black plastic washers instead steel one.
« Last Edit: April 30, 2024, 07:52:10 PM by Rnobx67 »