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Author Topic: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.  (Read 20757 times)

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Offline Syscrush

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #50 on: July 03, 2013, 08:02:53 PM »
I'm glad to see some movement on this again.  Especially interested to see the rear-mounted rad and how it works out.

It's your bike, but I have to say that FWIW, the exhaust in the rendering is stressing me out.
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Offline Letze

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #51 on: July 04, 2013, 06:37:23 AM »
how so? due to how low it's sitting? the factory headers actually hang that low in relation to the engine. If the rendering was true to life and suspension compression would allow the header to drag. That's an artistic rendering not a mechanically accurate one so some of it will change as I finish the new center frame section.
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Offline Syscrush

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #52 on: July 04, 2013, 02:44:08 PM »
Quote from: Letze on July 04, 2013, 06:37:23 AM
That's an artistic rendering not a mechanically accurate one so some of it will change as I finish the new center frame section.
That's all I had to hear. :)  Yes, I was concerned about how low the exhaust appeared to hang in that diagram.
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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

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #53 on: October 26, 2014, 01:59:30 PM »
I have started working on this thing again, After getting access to a CNC Plasma cutter I'm reconsidering how I can complete this bike.

Because this topic is worthless without pictures.



Width between the rear mounting plate is designed to clear the swing arm. as far as strength goes these plates will likely be doubled up for structural rigidity but that will be iterated upon as I continue to mess around with things. Things will get interesting soon...
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Offline SOHC4 Cafe Racer Fan

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #54 on: October 27, 2014, 12:35:14 AM »
About time!  Now let's see it come together!  ;D
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"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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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #55 on: October 27, 2014, 08:23:29 AM »
I get the whole modern power in a vintage look thing. I wonder if the 750 is the best package since it it is a little bit of a pig when it comes to turning. That's also because of the weight valance of the motor too.

What is the comparable weight of your 600 motor with respect to the 210 lb. 750 motor?
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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
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"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
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Offline Retro Rocket

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #56 on: October 27, 2014, 03:40:02 PM »
Quote from: CB750 Cafe Racer Fan on October 27, 2014, 08:23:29 AM
I get the whole modern power in a vintage look thing. I wonder if the 750 is the best package since it it is a little bit of a pig when it comes to turning.

You know what, I never considered the 750 "slow steering" or a "pig to turn", I actually think thats completely wrong, yes they weren't the lightest bikes on the road but when compared to what everyone else was putting out Z, GS, XS, the 750 was quite small and nimble. The 750's were prone to tank slappers due to their quickish steering geometry and small trail, which is why they went to different rake and trail and longer swingarms on the sportier F models for more stability. My friends and I used to ride the wheels of the old K 750's and when it came to back street point to point racing, we usually left the Z's for dead, lack of ground clearance was our only problem, never had a problem turning in, i used to do a lot of passing under brakes on the inside... ;D , I had a good friend that had a black Z1000 and he hated the tight stuff and loved the straights , it was the only place he could beat us  8)

My balls were a bit bigger back then... :o ;D

I've seen a 750 frame with a GSXR engine in it, had to look twice to notice. These old Honda's are being raced here in Australia with around 120HP and stock frames with a bit of bracing, only major difference is an 18 inch front wheel... Look up some of the T-Rex racing bikes... ;)
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Offline SOHC4 Cafe Racer Fan

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #57 on: October 27, 2014, 04:06:45 PM »
Quote from: Retro Rocket on October 27, 2014, 03:40:02 PM
Quote from: CB750 Cafe Racer Fan on October 27, 2014, 08:23:29 AM
I get the whole modern power in a vintage look thing. I wonder if the 750 is the best package since it it is a little bit of a pig when it comes to turning.

You know what, I never considered the 750 "slow steering" or a "pig to turn", I actually think thats completely wrong, yes they weren't the lightest bikes on the road but when compared to what everyone else was putting out Z, GS, XS, the 750 was quite small and nimble. The 750's were prone to tank slappers due to their quickish steering geometry and small trail, which is why they went to different rake and trail and longer swingarms on the sportier F models for more stability. My friends and I used to ride the wheels of the old K 750's and when it came to back street point to point racing, we usually left the Z's for dead, lack of ground clearance was our only problem, never had a problem turning in, i used to do a lot of passing under brakes on the inside... ;D , I had a good friend that had a black Z1000 and he hated the tight stuff and loved the straights , it was the only place he could beat us  8)

My balls were a bit bigger back then... :o ;D

I've seen a 750 frame with a GSXR engine in it, had to look twice to notice. These old Honda's are being raced here in Australia with around 120HP and stock frames with a bit of bracing, only major difference is an 18 inch front wheel... Look up some of the T-Rex racing bikes... ;)

Hi Mick,

I don't doubt the comparisons to period large bikes.  My comparison (in my internal dialogue) was as to the CB550 and in comparison to modern sport bikes -- both of which are easier (at least in my opinion) to get turned in.  I can also carry much more speed through corners in those bikes in comparison to the 750.  Sorry for lack of clarity.

Every time I ride my 750 after riding my 550, I wish it was as nimble, but the 550 is somewhere near 80-90 lbs lighter (I think).  Even my RC51, which is no featherweight, turns sharper.  Along with better suspension, I think that the 750 motor tends to be a little top heavy compared to most new modern fours and triples.  The 750 frame is also heavier, too. 

Don
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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
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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #58 on: October 27, 2014, 04:10:31 PM »
I think if Letze builds his frame with chromoly tubing and has it heat treated, it would be much lighter and stronger than the stock 750 frame.  I think the 600 motor will likely be lighter than the 750 motor, too, and more bottom weighted. 
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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 SOHC4 Cafe Racer Fan

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #59 on: October 27, 2014, 04:13:28 PM »
Letze,

Along with the weight of your 600 motor, what year is it?  Is it a 600RR or 600F motor?  How are you adapting the airbox for use on the 750 (modifying the box and your gas tank or something else)?

Don
« Last Edit: October 27, 2014, 04:16:40 PM by CB750 Cafe Racer Fan »
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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

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #60 on: October 27, 2014, 05:57:14 PM »
Quote from: CB750 Cafe Racer Fan on October 27, 2014, 04:06:45 PM
Quote from: Retro Rocket on October 27, 2014, 03:40:02 PM
Quote from: CB750 Cafe Racer Fan on October 27, 2014, 08:23:29 AM
I get the whole modern power in a vintage look thing. I wonder if the 750 is the best package since it it is a little bit of a pig when it comes to turning.

You know what, I never considered the 750 "slow steering" or a "pig to turn", I actually think thats completely wrong, yes they weren't the lightest bikes on the road but when compared to what everyone else was putting out Z, GS, XS, the 750 was quite small and nimble. The 750's were prone to tank slappers due to their quickish steering geometry and small trail, which is why they went to different rake and trail and longer swingarms on the sportier F models for more stability. My friends and I used to ride the wheels of the old K 750's and when it came to back street point to point racing, we usually left the Z's for dead, lack of ground clearance was our only problem, never had a problem turning in, i used to do a lot of passing under brakes on the inside... ;D , I had a good friend that had a black Z1000 and he hated the tight stuff and loved the straights , it was the only place he could beat us  8)

My balls were a bit bigger back then... :o ;D

I've seen a 750 frame with a GSXR engine in it, had to look twice to notice. These old Honda's are being raced here in Australia with around 120HP and stock frames with a bit of bracing, only major difference is an 18 inch front wheel... Look up some of the T-Rex racing bikes... ;)

Hi Mick,

I don't doubt the comparisons to period large bikes.  My comparison (in my internal dialogue) was as to the CB550 and in comparison to modern sport bikes -- both of which are easier (at least in my opinion) to get turned in.  I can also carry much more speed through corners in those bikes in comparison to the 750.  Sorry for lack of clarity.

Every time I ride my 750 after riding my 550, I wish it was as nimble, but the 550 is somewhere near 80-90 lbs lighter (I think).  Even my RC51, which is no featherweight, turns sharper.  Along with better suspension, I think that the 750 motor tends to be a little top heavy compared to most new modern fours and triples.  The 750 frame is also heavier, too. 

Don

Purely based on weight I see your point, hard to compare to late model bikes, totally different animals, the 17 inch wheels help the most with turn in but the rake and offset have to be in the right range as well. I thought about modifying a 750 frame for slightly less rake so it would match late model suspension better but there's a little bit more to it than just that...CycleX got close to perfect with their F model track bike....
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Offline Letze

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #61 on: October 27, 2014, 07:02:33 PM »
Questions

- Why The 750 Frame/Styling?: The lines of the 750 are the most appealing to me, the straight line coming from the front is just the way I want ti.  if you look in the thread I had a CBR600 F3 donor bike I could have easily used but visually that frame is ugly. I don't really like it. I wanted something that had the visuals of a CB750 with a modern suspension. I'm also addicted to projects.

- Weight I haven't put this guy on the scale, I'd imagine in the neighborhood of 125-150lbs I wouldn't call myself fit but compared to the CRF450 I have (~250lbs wet) this is easier to move around but not light enough that I'd risk a bathroom scale on it :P

- While this probably hits a legal gray area I've opted to have a new neck machined I'll be grafting the vin stamp from the original neck onto the new one. Cleaner welding surface and significantly easier to position for mating with the new frame.

- Engine is a 1992 CBR600 F2 Engine I had a few requirements had to be Honda, Carbureted, and actually a 600CC Supersport engine. I had been able to find a reasonable number of the F2 and F3 engines locally in good shape. The F4's when I found them were often more expensive and weren't as plentiful. Another factor was the CB600 F's having a detuned version of the engine up until 2006 so gaskets and maintenance components are still readily available at the local dealer. 

- Current plan is to run a hollow tank with the back half allocated to the Airbox/Electronics and the front half allocated to the gas tank, since it's a flat top you gain a significant volume back making the airbox sacrifice not as painful. You're still stuck with a little over a 1.75 gallon tank but it's usable estimating 40-50mpg This will also consolidate the wiring so It'll be less about creative routing and more about pruning the unnecessary items.

Other things

I've based my suspension geometry off of the bike the suspension came from. So pivot points try to mirror that of a 2007 GSX-R 600/750

For tubing thickness I'm eyeballing it based on my experience with the baja frame's fabrication. I won't know how much stress this can handle until I finish the assembly and do FEA testing at that point I'll reevaluate materials. sadly inventor doesn't have 4130 Chromoly tubing or tubing of any kind in the default materials library so I have to make my own which I really can't stand :(

1" x 0.095 wall Chromoly is 0.91lbs per foot and this frame (as pictured below) has about 16 ft of tubing used in it (according to inventor's BOM) keeping in mind that there are still the tab mounts and neck to be welded on adding about 5-6lbs  we're looking at 20lb frame without a tail.

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Offline SOHC4 Cafe Racer Fan

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #62 on: October 27, 2014, 07:53:35 PM »
Letze,

Very interesting CAD design for the frame.  I like the design idea and I am really looking forward to how it comes out.

100 hp and 47 ft/lbs. should be a great powerplant.  I imagine that the motor is somewhere around 130+lbs.  A substantial bump up from the 220+ lbs 750 motor producing 67 claimed hp and 44 ft/lbs.  You should end up with a 90 lb. weight loss PLUS the frame weight loss (with chromoly steel).  This is shaping into a great fun machine.

What's your estimated timeline for completing mock-up or at least getting a roller?
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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: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #63 on: October 28, 2014, 07:59:30 AM »
750 motors are around 176 lbs without carbs..
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Offline Syscrush

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #64 on: November 20, 2014, 04:26:24 PM »
Quote from: Letze on October 27, 2014, 07:02:33 PM
- While this probably hits a legal gray area I've opted to have a new neck machined I'll be grafting the vin stamp from the original neck onto the new one. Cleaner welding surface and significantly easier to position for mating with the new frame.
I'm pretty sure there's nothing grey about that area.  The consequences will vary from region to region, but I'm pretty sure that's not legal anywhere.  I think you'd be well-advised to do some research about getting a custom frame registered & titled in your area - in parts of the states I understand it's very easy.
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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 SOHC4 Cafe Racer Fan

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #65 on: November 20, 2014, 08:28:02 PM »
You'd be better off using the neck with the VIN and badge and building a custom frame attached to it.
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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 Syscrush

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #66 on: November 29, 2014, 09:54:32 AM »
It looks like you're in VA, is that right?  I'm pretty sure that getting a title for a full-custom frame there is basically just a trip to the DMV.  You're way better off going that route.
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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

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #67 on: December 15, 2014, 04:53:22 PM »
Technically using the neck alone is still incorrect in VA. I'll have to find the correct subsection but it states that once the vehicle is no longer recognizable as the bike it is titled as you are supposed to apply for a specially constructed vehicle. With the reconsideration of the design I have decided to abandon this goal and focus on making the best frame I can given my resources and time.

I did finally finish FEA testing on the frame after I called our school's support partner for Autodesk Inventor I was able to configure the tubing to the correct specs. While it technically would stand up to casual riding the factor of safety was about 1.35 I wouldn't feel safe on this bike if it wasn't a 2.0 or better.

I ended up running across this bike as well an F3 based bike employing a spaceframe. I've been trying to come up with a similar solution that allows me to keep the CB750 tank and straight backbone styling that I'm after.



I also just started a new full time job will help with the funding of this project I just need to clear out some space as it's getting crowded in here...



The kart is honda powered incase you were wondering... 2000 CR80R
« Last Edit: December 15, 2014, 04:55:49 PM by Letze »
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Offline SOHC4 Cafe Racer Fan

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #68 on: December 15, 2014, 05:24:24 PM »
That trellis frame using the engine as a stressed member would be no small engineering feat to pull off.  The straight backbone is not the best handling frame option for your modern motor but a necessary element to mounting a CB tank.  Most modern bikes use twin spar perimeter frames so there is room for the airbox, but they are so wide you will have a chore trying to fit a CB tank to it. 

Screw it.  Build yourself a chrome-moly trellis dual spar frame and a aluminum fuel tank, like this . . .
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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 Letze

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #69 on: December 15, 2014, 07:03:47 PM »
Just thinking about it now...

While widening the tank really isn't an option I think I'm going to mimic their frame configuration a few minor bits and I could attain the style I'm after.

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Offline SOHC4 Cafe Racer Fan

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #70 on: December 15, 2014, 07:08:06 PM »
That will take some work with the sliderule! Very ambitious.
Logged
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

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #71 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....
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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

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #72 on: December 15, 2014, 10:28:18 PM »
Quote from: Retro Rocket 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....

Mick,

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

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #73 on: December 16, 2014, 01:14:10 AM »
Quote from: CB750 Cafe Racer Fan on December 15, 2014, 10:28:18 PM
Quote from: Retro Rocket 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....

Mick,

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

Yes, another bonus.... ;)
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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

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Re: 76 CB750/GSX-R750/CBR600F2 Hybrid Build.
« Reply #74 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. :)
Logged
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.
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