Author Topic: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.  (Read 20466 times)

0 Members and 1 Guest are viewing this topic.

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #75 on: December 15, 2014, 10:04:30 PM »
Build an egli style frame, we have a member {Mec} here thats already done it.... You would need to widen the tanks tunnel a little to fit the frame...
http://motosfrance.free.fr/img/egli/egli1.jpg

You could build the subframe to suit....
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #76 on: December 15, 2014, 10:28:18 PM »
Build an egli style frame, we have a member {Mec} here thats already done it.... You would need to widen the tanks tunnel a little to fit the frame...
http://motosfrance.free.fr/img/egli/egli1.jpg

You could build the subframe to suit....

Mick,

That Egli has oil in the frame, right?  Very trick.
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 Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #77 on: December 16, 2014, 01:14:10 AM »
Build an egli style frame, we have a member {Mec} here thats already done it.... You would need to widen the tanks tunnel a little to fit the frame...
http://motosfrance.free.fr/img/egli/egli1.jpg

You could build the subframe to suit....

Mick,

That Egli has oil in the frame, right?  Very trick.

Yes, another bonus.... ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Syscrush

  • Expert
  • ****
  • Posts: 1,419
  • Sold. :(
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #78 on: December 16, 2014, 10:09:49 AM »
I just want to go on record as stating that I think that designing and building a frame/bike around a tank you like is a worthy and admirable goal.

Soichiro Honda wrote a couple of very compelling short essays on design, and what he has to say about the Buddha's eyebrow in this one reminds me of your project. :)
Life is precious: wear your f'n helmet!
There's nothing more expensive than a free bike...
FWIW, I'm not a shill for Race Tech - I've just got a thing for good suspension and the RTCE's are the most cost-effective mod for these old damping rod front ends.

Offline Letze

  • Full Member
  • *
  • Posts: 27
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #79 on: December 16, 2014, 07:43:18 PM »
Build an egli style frame, we have a member {Mec} here thats already done it.... You would need to widen the tanks tunnel a little to fit the frame...
http://motosfrance.free.fr/img/egli/egli1.jpg

You could build the subframe to suit....

I saw a build with a frame like that, the guy had an awesome frame jig and build table. The angle on the carbs forces me to have the airbox up relatively high so a more traditional backbone creates a great deal of complications.

I just want to go on record as stating that I think that designing and building a frame/bike around a tank you like is a worthy and admirable goal.

Soichiro Honda wrote a couple of very compelling short essays on design, and what he has to say about the Buddha's eyebrow in this one reminds me of your project. :)

Thanks man I'll be reading through that tonight.

I'm consolidating several measurement documents and diagrams I have for the engine and frame concepts I have measurement data from about 4 different bikes I'm sifting through at the moment. The range of parts from various bikes I have making this project up make the bike sound like Johnny Cash - One Piece at a Time.

Offline Riceman

  • Full Member
  • *
  • Posts: 81
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #80 on: December 16, 2014, 07:54:22 PM »
You could use this http://www.mandrel-bends.com/catalog/1-50-aluminum-2-25-radius-16-gauge-180-degree-mandrel-bend-646.html cut it up and get 4  22 1/2º bends to get the carbs to level out.
« Last Edit: December 16, 2014, 08:02:36 PM by Riceman »

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #81 on: December 16, 2014, 08:23:28 PM »
You could use this http://www.mandrel-bends.com/catalog/1-50-aluminum-2-25-radius-16-gauge-180-degree-mandrel-bend-646.html cut it up and get 4  22 1/2º bends to get the carbs to level out.

If you want to get hurt riding it. That aluminum tube cobbled together would not likely provide sufficient strength.
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 Riceman

  • Full Member
  • *
  • Posts: 81
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #82 on: December 16, 2014, 10:10:35 PM »
Then use stainless or maybe a bracket to steady them.

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 21,040
  • I refuse...
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #83 on: December 17, 2014, 03:21:57 AM »
Then use stainless or maybe a bracket to steady them.
Could use stainless, but why over mild steel? Chrome moly is probably a better choice than stainless, and nearly as light as aluminum. Could use aluminum, but you'd want at least 0.25" wall thickness, then welding it would take significant heat.

CroMo would be my choice for strength and weight and is very common today in lots of exotic bikes as the tubing metal. 0.083 thickness mandrel bent should easily do the trick.

Some of the Rickman 750s had no backbone, which seems to maybe offer you the space you were describing. I think the biggest challenge you'll face is incorporating the Honda motor into a suspended stressed member based upon where the factory mounts are.

I've seen folks fab brackets for the rear of the motor that tie into a backbone (eliminating the rear hoop and suspending the rear of the motor) and do the same in the front, but they always tie into a backbone and the "bracket" is quite substantial in billet. I am very interested to see how you solve it!
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #84 on: December 17, 2014, 07:37:00 AM »
Then use stainless or maybe a bracket to steady them.
Could use stainless, but why over mild steel? Chrome moly is probably a better choice than stainless, and nearly as light as aluminum. Could use aluminum, but you'd want at least 0.25" wall thickness, then welding it would take significant heat.

CroMo would be my choice for strength and weight and is very common today in lots of exotic bikes as the tubing metal. 0.083 thickness mandrel bent should easily do the trick.

Some of the Rickman 750s had no backbone, which seems to maybe offer you the space you were describing. I think the biggest challenge you'll face is incorporating the Honda motor into a suspended stressed member based upon where the factory mounts are.

I've seen folks fab brackets for the rear of the motor that tie into a backbone (eliminating the rear hoop and suspending the rear of the motor) and do the same in the front, but they always tie into a backbone and the "bracket" is quite substantial in billet. I am very interested to see how you solve it!

I agree with Cal about chrome-moly tubing. It'll give you better strength and lightness compared to mild steel.

Since you are using a modern motor you will not have the same mount constraints as with the 750 motor. Of course, as you know, you then need open space in place of the backbone to mount your carbs.

The engineering required definitely has my attention. Does your CAD program allow you to place the engine and carbs in empty space, then overlay the top shape of the tank, and then weave a frame around it using the mount points? Given the constraints, I think you will need to cut the bottom of the tank and create a new bottom to fit your frame and carbs.
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 Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #85 on: December 17, 2014, 02:28:15 PM »
You could use this http://www.mandrel-bends.com/catalog/1-50-aluminum-2-25-radius-16-gauge-180-degree-mandrel-bend-646.html cut it up and get 4  22 1/2º bends to get the carbs to level out.

If you want to get hurt riding it. That aluminum tube cobbled together would not likely provide sufficient strength.

Aluminum tube frame..... ;)


750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #86 on: December 17, 2014, 02:41:05 PM »
You could use this http://www.mandrel-bends.com/catalog/1-50-aluminum-2-25-radius-16-gauge-180-degree-mandrel-bend-646.html cut it up and get 4  22 1/2º bends to get the carbs to level out.

If you want to get hurt riding it. That aluminum tube cobbled together would not likely provide sufficient strength.

Aluminum tube frame..... ;)




Yeah, Mick.   ;) ;D  That tubing looks a little stronger than the 0.065" (16 Gauge) in the link.  The picture you have looks more like a Spondon frame.  Too bad even that frame doesn't have enough headspace to fit his carburetors which are angled more upwards.

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 Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #87 on: December 17, 2014, 02:47:39 PM »
You could use this http://www.mandrel-bends.com/catalog/1-50-aluminum-2-25-radius-16-gauge-180-degree-mandrel-bend-646.html cut it up and get 4  22 1/2º bends to get the carbs to level out.

If you want to get hurt riding it. That aluminum tube cobbled together would not likely provide sufficient strength.

Aluminum tube frame..... ;)




Yeah, Mick.   ;) ;D  That tubing looks a little stronger than the 0.065" (16 Gauge) in the link.  The picture you have looks more like a Spondon frame.  Too bad even that frame doesn't have enough headspace to fit his carburetors which are angled more upwards.


Looks good though..... ;D ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #88 on: December 17, 2014, 02:51:35 PM »
You could use this http://www.mandrel-bends.com/catalog/1-50-aluminum-2-25-radius-16-gauge-180-degree-mandrel-bend-646.html cut it up and get 4  22 1/2º bends to get the carbs to level out.

If you want to get hurt riding it. That aluminum tube cobbled together would not likely provide sufficient strength.

Aluminum tube frame..... ;)




Yeah, Mick.   ;) ;D  That tubing looks a little stronger than the 0.065" (16 Gauge) in the link.  The picture you have looks more like a Spondon frame.  Too bad even that frame doesn't have enough headspace to fit his carburetors which are angled more upwards.


Looks good though..... ;D ;)

I completely agree.  That frame looks bad-ass!!
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 calj737

  • Really Old Timer ...
  • *******
  • Posts: 21,040
  • I refuse...
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #89 on: December 17, 2014, 03:41:44 PM »
Bloody stinking beautiful, actually!
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline FunJimmy

  • Who you calling
  • Old Timer
  • ******
  • Posts: 3,802
  • Vancouver
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #90 on: December 17, 2014, 08:32:02 PM »
Spondon makes the coolest frames.
I want one.  :)
You never see a motorcycle parked outside of a psychiatrist's office!

CB550 Cafe Interceptor a Gentlemans Roadster
http://forums.sohc4.net/index.php?topic=27159.0

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #91 on: December 18, 2014, 04:17:18 PM »
Another possible way to go is to build a frame similar to a Drixton. Brent (bwaller) races one built by CMR Racing.  The frame design could accommodate the engine and allow open headspace for the carburetors.  You could then alter the 750SS fuel tank by adding an extension to the rear bottom like the following CB350 Drixton:

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