Topic: Front end swap

[The Duke]

Hey team.  I know there are lots of discussions on the forum about this, but no 2 cases are ever the exact same, so please indulge me and chime in if you can help.
I have a '74 CB750, and the fork tubes are just shot.  I have a line on some forks from an '82 DOHC CB750.  The tubes are still 35mm, so should fit in the stock clamps no problem, but is that a swap people have done?  I also want to upgrade to a dual disc on the front, so if I can find an '82 front wheel and calipers, then I figure I should be pretty well set.
Is anybody familiar with this idea?  Is my logic sound?
I am going to be replacing the master cylinder and lever with an aftermarket capable of pushing dual calipers, so that shouldn't be an issue.
I have attached a picture of the '82 forks.
Thanks in advance for any guidance.

[The Duke]

Update: I think these forks are actually off a CB750 Custom, according to Partzilla.

[scottly]

Those forks mount the axle in front of the center-line of the fork tubes, and will throw off the trail numbers if used with the stock triples. Look for '77/78 F-'79-81 750F, as these will slide right into the stock triples, and have the mounting lugs for the superior '82-up two piston calipers.

[TXRanger]

Another thing to find out is whether the fork leg spacing, center-to-center, is the same on both front ends. Even if the clamps are both 35mm, you could end up with wheel/axle/brake mounting issues if the widths are different. If the seller has the trees, maybe have him get this measurement before you commit.

[The Duke]

Both good points.  I think I might have to wait for some good quality forks to come on the market, or go with new tubes.  I also like the original forks because I want to add a second disc up front, and that's gonna be easier with the original '74 forks.
Thanks dudes.

[Bankerdanny]

Both good points.  I think I might have to wait for some good quality forks to come on the market, or go with new tubes.  I also like the original forks because I want to add a second disc up front, and that's gonna be easier with the original '74 forks.
Thanks dudes.

The easiest way by far to get dual disks is to fine a complete front end from a 77-78 750F and a pair of rotors from a 550. The only fab you need to do is to modify the speedo drive and shim the calipers to work with the wire wheel/rotor combo. I did it on my '76 750F in one day.

[The Duke]

Both good points.  I think I might have to wait for some good quality forks to come on the market, or go with new tubes.  I also like the original forks because I want to add a second disc up front, and that's gonna be easier with the original '74 forks.
Thanks dudes.

The easiest way by far to get dual disks is to fine a complete front end from a 77-78 750F and a pair of rotors from a 550. The only fab you need to do is to modify the speedo drive and shim the calipers to work with the wire wheel/rotor combo. I did it on my '76 750F in one day.

That would be a good option, since I'm not going to be using the speedo drive anyway.
Thanks

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