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Discussion Starter #1
I've got a GL1000 front end on my CB750 (K model frame, F model engine).
I've switched to a 5/8" front brake master cylinder from a '83 VT750.

If I were to do one more thing to improve braking on a GL1000 front end, what would it be? Short of "getting something better", please.

As well, I have a DOHC swingarm that is being milled to fit my frame, and I am now thinking of swtiching to a CB750F rear hub and brake set-up.

Has anyone done this? Are there any issues that I should be aware of?

I'm thinking, from the info gleaned with my somewhat-suspect eyeballs, that at most I may have to add a spacer, and add some tabs for mounting.

I would appreciate any info, suggestions etc etc.

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Discussion Starter #2
...the DOHC swingarm is for length. So no, the F model swingarm isn't an option.

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im running a 78F front end on my 76F. keeped the swiing arm.
im also doing with the twin pot front calipers off a 80s bike

There is the right way, the wrong way and the british way to do anything!
 

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quote:

If I were to do one more thing to improve braking on a GL1000 front end, what would it be? Short of "getting something better", please.
Get some braided steel brake lines. They will firm up the feel of the brake system.
quote:
As well, I have a DOHC swingarm that is being milled to fit my frame, and I am now thinking of swtiching to a CB750F rear hub and brake set-up.
Maybe its no help at all, but when I put a SOHC F rear wheel on a SOHC K model, I had to juggle parts (sprocket drive, spacers) back and forth to get the chain alignment/center the wheel alignment correct. I think I had to make a new spacer for the disc brake side also.

A steering damper helps on the GL front conversion.
quote:
Short of "getting something better", please.
Just in case. <img src=icon_smile_big.gif border=0 align=middle>

DG
 

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ok you have to be clearer on the year of the parts you are using in the rear. There are differences between F engines (75-76 vs 77-78). If you have a 77-78 F engine you will need to use the F's sprocket drive.

Also are you using a DOHC F swingarm? would be a little easier since the brake stay is already welded onto the arm.
 

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Discussion Starter #6
Alright... I'll try.

The rear hub is of unknown date. It is spoked, which I believe makes it a '76/ '77?

The swingarm? Also unknown. Round cross-section, definitely Honda.Same width between axle plates as my '78 K model swingarmm slightly wider than my '75 K model swingarm. About 1/2" wider at the pivot than either K model swingarm.

The engine is '76 F model.



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Discussion Starter #7
oh yeah... no brake stay on the swingarm.

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quote:
Alright... I'll try.

The rear hub is of unknown date. It is spoked, which I believe makes it a '76/ '77?

The swingarm? Also unknown. Round cross-section, definitely Honda.Same width between axle plates as my '78 K model swingarmm slightly wider than my '75 K model swingarm. About 1/2" wider at the pivot than either K model swingarm.

The engine is '76 F model.



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If the rear hub is spoked and disc braked and you are sure it came off a cb750 then it would be a 1975-1976 cb750 F/F1 rear hub, which means it should work with your 1976 F engine as is.

The swingarm sounds like a 1980-1982 K or C swingarm (but it could have come off another bike all together. Early 1979 DOHC F swingarms should fit SOHC frames with only a little filing at the pivot. As long as you are modifying the swingarm you should look into adding the mount for the brake locating arm. You can use the 76F arm as a reference for location. I am not 100% sure on this but I think the drum braked K's used the frame for the drum brake arm, the discs had it on the swingarm.

If it is the same width as your 78 K swingarm I would start with 78 K spacers and shim from there, you will probably need to add one on the sprocket side since the 78s have a wider spaced sprocket carrier.
 

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quote:
oh yeah... no brake stay on the swingarm.
Its unusual that the swing arm would not have a mounting point fot the brake stay rod. Some smaller bikes have a square locking lug on the swing arm (near the axle) that locks into the brake hub to keep it from turning when the brake is applied.
The SOHC K and the SOHC F have mounts for the brake stay rod on the swing arms (K, drum, on bottom- F,disc, on top).
Any pics of the swing arm?
DG
 

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Discussion Starter #10
OK.. should be clear, there's no brake stay for the disc brake caliper, it's got the tab under it.

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Discussion Starter #11
OK.. should be clear, there's no brake stay for the disc brake caliper, it's got the tab under it.

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Discussion Starter #12
Here's a link to my links to my pics of my swingarms (confusing enough)?

http://www.caferacer.net/forum/topic.asp?TOPIC_ID=5654

and here's the hub... it's the one in front... though now that I look at it again, the drilling looks kind of suspect, oh well, I'm apying less for the hub, rotor and spokes than I would for the spokes, so it's all good.



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Just looking at your pile of parts the six-bolt hubs and rotors won't work with the DOHC dual-piston calipers if I'm not mistaken...
 

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Discussion Starter #15
Nope... I'm only buying the hub/rotor and the spokes...

the pic is a just a "lot" pic that the guy has.

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