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Offline Jollydude

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1977 cb750
« on: December 30, 2016, 01:18:11 AM »
I'm building a 77 cb750 with a vfr750 single sided swing arm I'm looking for a twin brake  front fork setup that I could use the the stock vfr750 front wheel and rotors?


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Offline calj737

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Re: 1977 cb750
« Reply #1 on: December 30, 2016, 04:35:41 AM »
Why not use the donor front end and simply use an AllBalls conversion bearing kit to mate the donor triple tree to your 750? Or, are you determined to use the stock forks (conventional) and the VFR wheel? If so, you might fare better with a GL front fork setup and then deal with spacers to align the VFR wheel within the forks. Also, what diameter is the front axle on the VFR? That determines the ease of fitment for "other forks".
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline Jollydude

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Re: 1977 cb750
« Reply #2 on: December 30, 2016, 04:48:31 AM »
I'm thinking about pressing in a cb750 stem into the vfr front forks. I want to keep the wheel matched up with the rear but that vfr donor has a ridiculous linked brake setup.


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Offline calj737

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Re: 1977 cb750
« Reply #3 on: December 30, 2016, 05:09:39 AM »
The conversion bearings may obviate the stem swap. Is there not a dual disc, non-linked caliper setup from Brembo? They offer vast amounts of rotors and calipers for retro fitting brakes to a wide variety of bikes. You may need to fashion mounts, but that's fairly simple.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline Jollydude

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Re: 1977 cb750
« Reply #4 on: December 30, 2016, 05:22:43 AM »
Thanks I'm going to look into that bearing conversion kit. Somebody just sent me some info on delinking the vfr brakes it would be awesome if that works they are Nissin brakes


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Offline SOHC4 Cafe Racer Fan

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Re: 1977 cb750
« Reply #5 on: December 30, 2016, 09:26:01 AM »
I am a fan of single-sided swingarms, but is the juice worth the squeeze? 

The VFR swingarm is quite a bit longer than the stock swingarm.  This will obviously affect handling, assuming that you can properly dial in a shock to provide proper suspension travel for the weight of the bike and rider. Your bike will now require more effort to turn. In addition, I highly suspect that the VFR swingarm is heavier than the stock CB swingarm.  IF the swingarm is heavier than its stock counterpart, are you going to improve the power of the engine to compensate?  Even so, the bike will have more inertia and require additional effort to change direction. 

If the purpose of the bike is to drag or just for looks, most of the foregoing can be ignored -- except for figuring out how to dial in the suspension to that the rear properly hooks up on acceleration. 

Just curious.  Maybe you've already taken off of this into account.
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Offline Jollydude

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Re: 1977 cb750
« Reply #6 on: December 30, 2016, 02:16:29 PM »
Quote from: CB750 Cafe Racer Fan on December 30, 2016, 09:26:01 AM
I am a fan of single-sided swingarms, but is the juice worth the squeeze? 

The VFR swingarm is quite a bit longer than the stock swingarm.  This will obviously affect handling, assuming that you can properly dial in a shock to provide proper suspension travel for the weight of the bike and rider. Your bike will now require more effort to turn. In addition, I highly suspect that the VFR swingarm is heavier than the stock CB swingarm.  IF the swingarm is heavier than its stock counterpart, are you going to improve the power of the engine to compensate?  Even so, the bike will have more inertia and require additional effort to change direction. 

If the purpose of the bike is to drag or just for looks, most of the foregoing can be ignored -- except for figuring out how to dial in the suspension to that the rear properly hooks up on acceleration. 

Just curious.  Maybe you've already taken off of this into account.




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Offline Jollydude

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Re: 1977 cb750
« Reply #7 on: December 30, 2016, 02:26:19 PM »
I'm also considering this stock swing arm setup.  I really dig how clean it looks. http://www.kineticmotorcycles.com/monoshock-conversion/cb500-monoshock-kit-coming-soon


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Offline palepainter

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Re: 1977 cb750
« Reply #8 on: December 30, 2016, 02:43:21 PM »
Is it truly a monoshock suspension when it has two shocks.  :P  I like what you have going on.
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Offline Jollydude

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Re: 1977 cb750
« Reply #9 on: December 30, 2016, 09:41:13 PM »
Quote from: palepainter on December 30, 2016, 02:43:21 PM
Is it truly a monoshock suspension when it has two shocks.  :P  I like what you have going on.

With the kinetic setup ya can run the twin or mono. Ya dig the vfr swing arm tight fit lots of small issues to over come to make it work defiantly gives this ride some attitude. I'm also putting on a Gordon quick disconnect backbone kit for the frame, a set of halo demon headlights and a 850 bore job on the motor


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Offline Jollydude

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Re: 1977 cb750
« Reply #10 on: January 02, 2017, 07:45:35 PM »
Quote from: Jollydude on December 30, 2016, 01:18:11 AM
I'm building a 77 cb750 with a vfr750 single sided swing arm I'm looking for a twin brake  front fork setup that I could use the the stock vfr750 front wheel and rotors?


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Offline Jollydude

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Re: 1977 cb750
« Reply #11 on: January 02, 2017, 07:47:30 PM »
Quote from: Jollydude on January 02, 2017, 07:45:35 PM
Quote from: Jollydude on December 30, 2016, 01:18:11 AM
I'm building a 77 cb750 with a vfr750 single sided swing arm I'm looking for a twin brake  front fork setup that I could use the the stock vfr750 front wheel and rotors?


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Offline Jollydude

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Re: 1977 cb750
« Reply #12 on: January 02, 2017, 07:49:29 PM »
Quote from: Jollydude on January 02, 2017, 07:47:30 PM
Quote from: Jollydude on January 02, 2017, 07:45:35 PM
Quote from: Jollydude on December 30, 2016, 01:18:11 AM
I'm building a 77 cb750 with a vfr750 single sided swing arm I'm looking for a twin brake  front fork setup that I could use the the stock vfr750 front wheel and rotors?


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Started the Gordon's frame kit and chopped my tail off for a frame loop I'm adding


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Offline cb750tr

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Re: 1977 cb750
« Reply #13 on: January 03, 2017, 02:19:40 AM »
Quote from: Jollydude on December 30, 2016, 05:22:43 AM
Thanks I'm going to look into that bearing conversion kit. Somebody just sent me some info on delinking the vfr brakes it would be awesome if that works they are Nissin brakes


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I've delinked some Nissin brakes in my project.

Link: http://forums.sohc4.net/index.php/topic,157587.msg1819177.html#msg1819177
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Offline calj737

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Re: 1977 cb750
« Reply #14 on: January 03, 2017, 03:25:42 AM »
Pay careful attention to tire/frame conflict at the loop under full suspension compression. The stock bridged gusset is raised for a reason.  ;)
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline Jollydude

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Re: 1977 cb750
« Reply #15 on: January 03, 2017, 05:38:02 AM »
Quote from: cb750tr on January 03, 2017, 02:19:40 AM
Quote from: Jollydude on December 30, 2016, 05:22:43 AM
Thanks I'm going to look into that bearing conversion kit. Somebody just sent me some info on delinking the vfr brakes it would be awesome if that works they are Nissin brakes


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I've delinked some Nissin brakes in my project.

Link: http://forums.sohc4.net/index.php/topic,157587.msg1819177.html#msg1819177

I got a cbr600rr front end complete I'm putting on. Im looking at using the stock rear caliper with a new Nissin rear master. I'm really digging the inverted front end with dual brakes


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Offline Jollydude

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Re: 1977 cb750
« Reply #16 on: January 03, 2017, 05:46:24 AM »
Quote from: calj737 on January 03, 2017, 03:25:42 AM
Pay careful attention to tire/frame conflict at the loop under full suspension compression. The stock bridged gusset is raised for a reason.  ;)
Ya I've been mocking it up on the cross bar so the it's a 17inch rear which gives me a inch less then stock and I also have a couple of more inches longer trail and the shock mount is a bit lower then stock. Sitting on it with it all mounted it feels pretty good.


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Offline posmtownScott

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Re: 1977 cb750
« Reply #17 on: April 23, 2017, 11:44:57 AM »
DUDE!!! that looks freaknawsm. You are off to a great start. I'm doing the same thing with my 76'. GSXR front and same vfr800 rear. have you posted any more on this build? I'd love to see more. how does it handle?
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