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Author Topic: 1970 Honda CB750 Restromod  (Read 5991 times)

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Offline drkush

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1970 Honda CB750 Restromod
« on: May 11, 2015, 01:42:11 PM »
About a year ago a good friend of mine had to move and needed a place to store his CB750 collection, in return he gave me this 1970 CB750, ( told would store for free,But) I tore the bike down to bear frame and went from there.. A little over a year later and many sore knuckles, loss of blood and tears but I'm real close to finishing her



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Offline flybox1

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Re: 1970 Honda CB750 Restromod
« Reply #1 on: May 11, 2015, 01:54:36 PM »
looks nice, but where are the rest of your frame tubes?  :o
some serious twisting going on when cornering, especially without those frame rails and triangle.  might be detrimental  :-\

« Last Edit: May 11, 2015, 02:35:54 PM by flybox1 »
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Offline Duke McDukiedook

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Re: 1970 Honda CB750 Restromod
« Reply #2 on: May 12, 2015, 03:24:37 PM »
Quote from: flybox1 on May 11, 2015, 01:54:36 PM
looks nice, but where are the rest of your frame tubes?  :o
some serious twisting going on when cornering, especially without those frame rails and triangle.  might be detrimental  :-\

+1, ya gots some welding to do unless you like the shakey wakeys.
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"Well, Mr. Carpetbagger. We got somethin' in this territory called the Missouri boat ride."   Josey Wales

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Offline Retro Rocket

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Re: 1970 Honda CB750 Restromod
« Reply #3 on: May 12, 2015, 03:59:03 PM »
Why did you remove the frame rails..?  You've made that bike dangerous, there's not a snow balls chance in hell i'd ride it like that.. There are frame kits that allow the side rails to be removed for engine removal and then, reinstalled, if I were you, i would be looking seriously into replacing those rails with a kit and make that bike safe once more. Sorry if i sound a bit harsh but thats one of the sillier things i've seen here on this forum, and you won't find many people that understand these bikes that will disagree....
« Last Edit: May 12, 2015, 04:20:51 PM by Retro Rocket »
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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: 1970 Honda CB750 Restromod
« Reply #4 on: May 12, 2015, 04:08:56 PM »
Please tell us you have a frame kit hiding somewhere in that garage.  You will otherwise need some additional support to substitute for the removed frame rails under the main backbone.   :o
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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)
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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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2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
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Offline Retro Rocket

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Re: 1970 Honda CB750 Restromod
« Reply #5 on: May 12, 2015, 04:17:50 PM »
Quote from: CB750 Cafe Racer Fan on May 12, 2015, 04:08:56 PM
Please tell us you have a frame kit hiding somewhere in that garage.  You will otherwise need some additional support to substitute for the removed frame rails under the main backbone.   :o

Yes, its now 500 plus pounds of motorcycle held together buy the connection between the top rail and the tank mount.... :o
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750 K2 1000cc
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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: 1970 Honda CB750 Restromod
« Reply #6 on: May 12, 2015, 05:07:16 PM »
It looks like you spent an appreciable amount of time adapting the new front end and rear disc, and removing/reinstalling the motor (not sure if it was rebuilt).  If you don't have a fix for the frame, you may want to buy a replacement and swap your parts onto 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 Retro Rocket

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Re: 1970 Honda CB750 Restromod
« Reply #7 on: May 12, 2015, 06:45:10 PM »
Quote from: calj737 on May 12, 2015, 06:21:37 PM
Seeing as nobody mentioned it so far, are you aware there are frame kits to alleviate needlessly and dangerously removing those tubes?
Quote from: Retro Rocket on May 12, 2015, 03:59:03 PM
There are frame kits that allow the side rails to be removed for engine removal and then, reinstalled,

 ;D ;)
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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.

scrapvalue

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Re: 1970 Honda CB750 Restromod
« Reply #8 on: May 12, 2015, 06:49:52 PM »
Has anyone heard or seen a frame fail from this mod?   Just wondering.
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Offline Retro Rocket

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Re: 1970 Honda CB750 Restromod
« Reply #9 on: May 12, 2015, 07:05:40 PM »
Quote from: scrapvalue on May 12, 2015, 06:49:52 PM
Has anyone heard or seen a frame fail from this mod?   Just wondering.

It doesn't take much though see the problems scrap, one of the inherent weaknesses in these frames is immediately above the swingarm pivot, apart from a cross brace above the pivot, the other place to brace is in the corner of where the outer rails meet the frame sections coming up from the rear engine mounts, they are now gone, the other place is the steering head,  those  forces will now allow lateral movement and twisting forces at the base of that one remaining frame rail, not to mention braking and cornering stresses, usually absorbed at a number of different points on the frame, these will all now be transferred to the weakest point, being the join where the top tube meets the tank mount, it doesn't need to break to make it unsafe, I would put my money on that join being fatigued from all the stress it will now be put under........
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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 Stev-o

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Re: 1970 Honda CB750 Restromod
« Reply #10 on: May 12, 2015, 07:33:10 PM »
I think you guys scared him off.  Personally, I think it's perfectly safe the way it is. Well, unless he plans to ride it...
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Offline Duanob

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Re: 1970 Honda CB750 Restromod
« Reply #11 on: May 13, 2015, 03:34:51 PM »
Dr. Kush is the name of some potent legal weed they sell down at my local green shop. Coincidence?
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Offline flybox1

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Re: 1970 Honda CB750 Restromod
« Reply #12 on: May 13, 2015, 04:09:16 PM »
Quote from: Duanob on May 13, 2015, 03:34:51 PM
Dr. Kush is the name of some potent legal weed they sell down at my local green shop. Coincidence?
I dub that bike The Kushery  ;D
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Stev-o

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Re: 1970 Honda CB750 Restromod
« Reply #13 on: May 13, 2015, 04:22:08 PM »
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Offline flybox1

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Re: 1970 Honda CB750 Restromod
« Reply #14 on: May 13, 2015, 04:31:27 PM »
that's very faded candy jade green-like  8)

meh...i see some CBO in there, too  ;D
« Last Edit: May 13, 2015, 04:34:35 PM by flybox1 »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Retro Rocket

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Re: 1970 Honda CB750 Restromod
« Reply #15 on: May 13, 2015, 04:54:39 PM »
Berry good..... 8)
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Offline SOHC4 Cafe Racer Fan

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Re: 1970 Honda CB750 Restromod
« Reply #16 on: May 13, 2015, 05:04:44 PM »
I feel bad that he put a good chunk of effort into getting the bike that far.  I'm sure he did not expect that feedback, but to run it like that would NOT be good.
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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: 1970 Honda CB750 Restromod
« Reply #17 on: May 13, 2015, 05:14:39 PM »
Quote from: CB750 Cafe Racer Fan on May 13, 2015, 05:04:44 PM
I feel bad that he put a good chunk of effort into getting the bike that far.  I'm sure he did not expect that feedback, but to run it like that would NOT be good.

I agree to all of that Don, its a shame he didn't ask about those frame mods first...
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750 K2 1000cc
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750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Duke McDukiedook

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Re: 1970 Honda CB750 Restromod
« Reply #18 on: May 14, 2015, 08:21:12 AM »
Quote from: Duanob on May 13, 2015, 03:34:51 PM
Dr. Kush is the name of some potent legal weed they sell down at my local green shop. Coincidence?

Why anyone would want more than a 60% indica is beyond me. I prefer my blends balanced around 50/50 and be able to actually do something after imbibing.
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"Well, Mr. Carpetbagger. We got somethin' in this territory called the Missouri boat ride."   Josey Wales

"It's Baltimore, gentlemen. The gods will not save you." Ervin Burrell

CB750 K3 crat | (2) 1986 VFR750F

Offline Retro Rocket

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Re: 1970 Honda CB750 Restromod
« Reply #19 on: May 14, 2015, 03:28:46 PM »
Quote from: DukieDukenDuke on May 14, 2015, 08:21:12 AM
Quote from: Duanob on May 13, 2015, 03:34:51 PM
Dr. Kush is the name of some potent legal weed they sell down at my local green shop. Coincidence?

Why anyone would want more than a 60% indica is beyond me. I prefer my blends balanced around 50/50 and be able to actually do something after imbibing.

Like eat     ;D 8)



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

Offline Stev-o

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Re: 1970 Honda CB750 Restromod
« Reply #20 on: May 14, 2015, 05:21:26 PM »
Quote from: Retro Rocket on May 14, 2015, 03:28:46 PM
Quote from: DukieDukenDuke on May 14, 2015, 08:21:12 AM
Quote from: Duanob on May 13, 2015, 03:34:51 PM
Dr. Kush is the name of some potent legal weed they sell down at my local green shop. Coincidence?

Why anyone would want more than a 60% indica is beyond me. I prefer my blends balanced around 50/50 and be able to actually do something after imbibing.

Like eat     ;D 8)





And drink
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline flybox1

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Re: 1970 Honda CB750 Restromod
« Reply #21 on: May 14, 2015, 08:58:41 PM »
OG Kush is 50/50, with a nice mango aftertaste.   No couchlock  :P
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Duke McDukiedook

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Re: 1970 Honda CB750 Restromod
« Reply #22 on: May 15, 2015, 09:11:29 AM »
I got some Himalayan Gold 50/50 on my last trip. Not bad.
 
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"Well, Mr. Carpetbagger. We got somethin' in this territory called the Missouri boat ride."   Josey Wales

"It's Baltimore, gentlemen. The gods will not save you." Ervin Burrell

CB750 K3 crat | (2) 1986 VFR750F

Offline flybox1

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Re: 1970 Honda CB750 Restromod
« Reply #23 on: May 15, 2015, 02:23:03 PM »
Quote from: DukieDukenDuke on May 15, 2015, 09:11:29 AM
I got some Himalayan Gold 50/50 on my last trip. Not bad.
Critical 47 is what I've got now.

Check out the app LEAFLY
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Stev-o

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Re: 1970 Honda CB750 Restromod
« Reply #24 on: May 31, 2015, 05:22:10 AM »
You guys are spoiled up there.  Wish it was as easy as going to the corner store.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........
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