Author Topic: Looking for Gordon frame mod equivalent 1975 CB750f  (Read 1513 times)

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Offline kingrabbit

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Looking for Gordon frame mod equivalent 1975 CB750f
« on: June 02, 2024, 08:00:45 AM »
Hi
I want to access the valve train on my CB 750f but don’t want to pull the engine. Does anyone know who sells a kit to modify the frame? Gordon Frame Kit doesn’t seem to be available anymore.
Much appreciate any info.
Thanks
Don
'74 CB 550K
'75 CB 750F
'73 XLH 1000

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Offline newday777

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #1 on: June 02, 2024, 10:54:27 AM »
I don't remember what the Gondon kit was like. Was it a weld in place bungs or clamp style like Frank and Scottly were making?
But Carpy's has a weld in frame kit

https://carpyscaferacers.com/shop/shop-our-store/motorcycle-parts-accessories/honda-cb500-cb550-cb750-parts-upgrades/frame-adapter-honda/
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #2 on: June 02, 2024, 11:09:20 AM »
Check CycleX
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline newday777

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #3 on: June 02, 2024, 11:14:29 AM »
Did you call RRRToolsolutions to see if they have the kits?

https://www.rrrtoolsolutions.com/honda-cb750-frame-kit.php
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline PeWe

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #4 on: June 02, 2024, 11:22:29 AM »
Or "Frank's Weldless" clamps that forum member scottly produced for a while when Frank stopped making them.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline bustech51

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #5 on: June 02, 2024, 01:02:10 PM »
Carpys Cafe Racer in California makes a nice kit.  I have used both with no problems.

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Offline CB750R

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #6 on: June 02, 2024, 01:40:36 PM »
I used the cycle-x kit. With its tube clamp style it’s not the easiest to remove/install the frame section but it works. It was 1000% easier to install my engine!

Online scottly

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #7 on: June 02, 2024, 08:15:22 PM »
Yeah, the inter-locking style of the Cycle-X parts can make it more difficult to fit than the flat Carpy style, especially if the split is vertical instead of horizontal. Do either of them provide the straps and bolts for the triangle piece? The last run of weldless kits I did a whole bunch of straps while I had the machine set up for them, and I have a bunch left over, along with the bolts and nuts.
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Offline spotty

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #8 on: June 02, 2024, 09:07:29 PM »
didn't terry make some kits using old fork tubes split and drilled for the clamps ?
i blame Terry

Offline willbird

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #9 on: June 03, 2024, 03:57:15 AM »
Or "Frank's Weldless" clamps that forum member scottly produced for a while when Frank stopped making them.

One nice thing about Frank's design is that one could use it NOW, then if later on you did a full frame up restore you could use a welded type then.

I have worked up some stuff to make my own but not actually cut my K3 frame yet.


The "keys" prevent the tension of the joint from only being handled by the bolts, but after much thinking driving to and from work and other idle cpu time I think that fit up may be really tough to weld in and have it fit nice. I was thinking about 1" round tube gussets to replce the stock bent flat steel too, but now thinking more like 3/4" flushed out to the outer tubes would be sufficient and nicer, even 1/2" may be sufficient really.

A simpler joint like this but longer like the other version is what I think I will use. There is a huge amount of "grab" in the flat surface using a 1/4" button head cap screw torqued properly so that in fact the tension IMHO is not only taken by the bolt.



Offline kingrabbit

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #10 on: June 03, 2024, 06:47:36 AM »
Great info friends. My CB has been sitting for two seasons cause I just don’t want the hassle of pulling that engine just to check the top end. I’m pretty sure my issue is a plugged oil gallery is starving the valves on number four. My plan is to pull the camshaft and clear the gallery. I’m being optimistic I know.
I will note the RRR page says about the Gordon kit:
NOTE: These as designed exclusively for the Honda CB750 K0 ~K8 series from 1969 ~ 1978.
My scoot’s an F. Will it still work?
I called and left a message for clarification.
I was on the CycleX page too and saw their kit. Looks good too. But I couldn’t find a video on YouTube about installing it.
'74 CB 550K
'75 CB 750F
'73 XLH 1000

Donny

Offline CB750R

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #11 on: June 03, 2024, 07:26:26 AM »
Can’t see why it wouldn’t work on your F, I have a 77 F2 and the frame kit I purchased from cycle-x fit the I.D. of my frame tubes.

The Cycle-x kit didn’t include tabs to re attach the “triangle” I just used some flat bar, but having the welded nuts on the backside is a nice call!

Offline PeWe

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #12 on: June 03, 2024, 10:32:52 AM »
Frank's kit good for an eventual future going back to stock, weld frame.
Only missing metal, the thickness of the saw blade, ca 2mm that will be a good fill for a welder.
Plus the holes in the triangle that must be an important part of the frame.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Don R

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #13 on: June 04, 2024, 04:02:11 PM »
  My Hot Rod bike had been cut years ago and I actually used a Franks style kit to re-install the lower tubes from an F1 frame into a K1 frame. I had to re-weld on the top sections of the triangle also and then cut them in the middle for the bolt-ons.
   
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Offline grcamna2

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #14 on: June 04, 2024, 10:17:44 PM »
Or "Frank's Weldless" clamps that forum member scottly produced for a while when Frank stopped making them.

One nice thing about Frank's design is that one could use it NOW, then if later on you did a full frame up restore you could use a welded type then.

I have worked up some stuff to make my own but not actually cut my K3 frame yet.


The "keys" prevent the tension of the joint from only being handled by the bolts, but after much thinking driving to and from work and other idle cpu time I think that fit up may be really tough to weld in and have it fit nice. I was thinking about 1" round tube gussets to replce the stock bent flat steel too, but now thinking more like 3/4" flushed out to the outer tubes would be sufficient and nicer, even 1/2" may be sufficient really.

A simpler joint like this but longer like the other version is what I think I will use. There is a huge amount of "grab" in the flat surface using a 1/4" button head cap screw torqued properly so that in fact the tension IMHO is not only taken by the bolt.



I really like the ones in the top pic,on the wooden table;they look to be designed to lock-together good and solid  ;)
« Last Edit: June 04, 2024, 10:19:19 PM by grcamna2 »
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline willbird

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #15 on: June 05, 2024, 04:01:20 AM »
Or "Frank's Weldless" clamps that forum member scottly produced for a while when Frank stopped making them.

One nice thing about Frank's design is that one could use it NOW, then if later on you did a full frame up restore you could use a welded type then.

I have worked up some stuff to make my own but not actually cut my K3 frame yet.


The "keys" prevent the tension of the joint from only being handled by the bolts, but after much thinking driving to and from work and other idle cpu time I think that fit up may be really tough to weld in and have it fit nice. I was thinking about 1" round tube gussets to replce the stock bent flat steel too, but now thinking more like 3/4" flushed out to the outer tubes would be sufficient and nicer, even 1/2" may be sufficient really.

A simpler joint like this but longer like the other version is what I think I will use. There is a huge amount of "grab" in the flat surface using a 1/4" button head cap screw torqued properly so that in fact the tension IMHO is not only taken by the bolt.



I really like the ones in the top pic,on the wooden table;they look to be designed to lock-together good and solid  ;)

I only built in .005" slop of the keys in the keyways though, hindsight has me thinking welding them in will move things enough that .005" is not enough.

Bill

Offline grcamna2

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #16 on: June 05, 2024, 08:42:07 AM »
Or "Frank's Weldless" clamps that forum member scottly produced for a while when Frank stopped making them.

One nice thing about Frank's design is that one could use it NOW, then if later on you did a full frame up restore you could use a welded type then.

I have worked up some stuff to make my own but not actually cut my K3 frame yet.


The "keys" prevent the tension of the joint from only being handled by the bolts, but after much thinking driving to and from work and other idle cpu time I think that fit up may be really tough to weld in and have it fit nice. I was thinking about 1" round tube gussets to replce the stock bent flat steel too, but now thinking more like 3/4" flushed out to the outer tubes would be sufficient and nicer, even 1/2" may be sufficient really.

A simpler joint like this but longer like the other version is what I think I will use. There is a huge amount of "grab" in the flat surface using a 1/4" button head cap screw torqued properly so that in fact the tension IMHO is not only taken by the bolt.



I really like the ones in the top pic,on the wooden table;they look to be designed to lock-together good and solid  ;)

I only built in .005" slop of the keys in the keyways though, hindsight has me thinking welding them in will move things enough that .005" is not enough.

Bill

I suppose you would bolt them together tight first,then weld them?
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline willbird

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #17 on: June 05, 2024, 11:45:14 AM »
Or "Frank's Weldless" clamps that forum member scottly produced for a while when Frank stopped making them.

One nice thing about Frank's design is that one could use it NOW, then if later on you did a full frame up restore you could use a welded type then.

I have worked up some stuff to make my own but not actually cut my K3 frame yet.


The "keys" prevent the tension of the joint from only being handled by the bolts, but after much thinking driving to and from work and other idle cpu time I think that fit up may be really tough to weld in and have it fit nice. I was thinking about 1" round tube gussets to replce the stock bent flat steel too, but now thinking more like 3/4" flushed out to the outer tubes would be sufficient and nicer, even 1/2" may be sufficient really.

A simpler joint like this but longer like the other version is what I think I will use. There is a huge amount of "grab" in the flat surface using a 1/4" button head cap screw torqued properly so that in fact the tension IMHO is not only taken by the bolt.



I really like the ones in the top pic,on the wooden table;they look to be designed to lock-together good and solid  ;)

I only built in .005" slop of the keys in the keyways though, hindsight has me thinking welding them in will move things enough that .005" is not enough.

Bill

I suppose you would bolt them together tight first,then weld them?

I think things will still shrink and move though. I think if you were selling them those keys would be a real lure to buyers ;-), but I still think that the joint clamped up with a 1/4-28 bolt torqued properly is not honestly putting the bolt in shear, the ends of the joints take care of compression forces.

Offline Don R

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #18 on: June 06, 2024, 02:06:51 PM »
 I just looked at the cycleX splices and really like the locking shape, in my opinion are way better than the flat surfaces bolted together. I think my Gordons kid had something like that.
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Offline PeWe

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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Finnigan

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #20 on: June 06, 2024, 11:18:20 PM »
I still have an unused kit from a member here that is still in the wrappings, I don't plan to use it and could offer it for good price

Offline willbird

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #21 on: June 07, 2024, 03:59:26 AM »
I just looked at the cycleX splices and really like the locking shape, in my opinion are way better than the flat surfaces bolted together. I think my Gordons kid had something like that.

I have a half hour drive to and from work so ponder on all kinds of things, the frame kit is one such thing. The area IMHO is not highly stressed enough for the "good, best, and better" options may ALL work just fine really. I'm not fond of the erector set solutions to splicing the gussets, would prefer to totally remove them and make steel tube round gussets.

Bill

Offline kingrabbit

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #22 on: June 18, 2024, 03:02:41 PM »
Alright just got the Cycle X kit today. Exciting! My question is where exactly do I make my cuts?
'74 CB 550K
'75 CB 750F
'73 XLH 1000

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Offline calj737

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #23 on: June 18, 2024, 04:56:33 PM »
I think things will still shrink and move though. I think if you were selling them those keys would be a real lure to buyers ;-), but I still think that the joint clamped up with a 1/4-28 bolt torqued properly is not honestly putting the bolt in shear, the ends of the joints take care of compression forces.
One option is to weld the bungs in, but make the “tube” from solid aluminum round bar. That piece you can cut after the welding process to ensure a proper fit-up. I bolted them together during the weld process to keep the alignment perfect. After welding, the smallest amount of sanding brought the fit in perfectly.

The weight difference is neglible, the strength is massive.
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Offline spotty

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Re: Looking for Gordon frame mod equivalent 1975 CB750f
« Reply #24 on: June 18, 2024, 06:29:49 PM »
I think things will still shrink and move though. I think if you were selling them those keys would be a real lure to buyers ;-), but I still think that the joint clamped up with a 1/4-28 bolt torqued properly is not honestly putting the bolt in shear, the ends of the joints take care of compression forces.
One option is to weld the bungs in, but make the “tube” from solid aluminum round bar. That piece you can cut after the welding process to ensure a proper fit-up. I bolted them together during the weld process to keep the alignment perfect. After welding, the smallest amount of sanding brought the fit in perfectly.

The weight difference is neglible, the strength is massive.

thats a nice version of this , how do you fix the attach to the top tube bits ?
i blame Terry