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Author Topic: Cb750 dual disk upgrade  (Read 13284 times)

Offline MarkCR750

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Re: Cb750 dual disk upgrade
« Reply #30 on: June 26, 2015, 08:19:58 PM »
The arms I used are as below, it could well be that you need these arms.
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1977 K7 CR750 (lookalike, what of I’m not sure)
Ducati 900SS (Soul & Speed)
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Offline El__burro

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Re: Cb750 dual disk upgrade
« Reply #31 on: June 26, 2015, 08:54:24 PM »
I thought so.
Do you have them on both sides I guess,  what about the fender?
Thanks
El__Burro
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Online Bryanj

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Re: Cb750 dual disk upgrade
« Reply #32 on: June 26, 2015, 09:06:05 PM »
They wont fit on the early style fork slider
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Offline El__burro

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Re: Cb750 dual disk upgrade
« Reply #33 on: June 26, 2015, 09:08:46 PM »
Mmm from bad to worse.
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Offline MarkCR750

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Re: Cb750 dual disk upgrade
« Reply #34 on: June 27, 2015, 07:02:13 PM »
Quote from: El__burro on June 26, 2015, 08:54:24 PM
I thought so.
Do you have them on both sides I guess,  what about the fender?
Thanks
El__Burro
Yes both sides, I'm not fitting a mudguard, I prefer the look without, but you can fit one as shown below, bad luck it appears you may need new forks then? or just stick with single disc.
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Suzuki GT250A (Nostalgia)
1977 K7 CR750 (lookalike, what of I’m not sure)
Ducati 900SS (Soul & Speed)
Ducati M900 Monster (Handling & character)
Thruxton 1200 (suits me)
James Captain 197 (pure adrenaline, i.e. no brakes!)
"Eff yir gitten awvestear yir gooin te farst"
Sir J.Stewart.

Online Bryanj

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Re: Cb750 dual disk upgrade
« Reply #35 on: June 27, 2015, 07:38:29 PM »
The "mirror image" caliper bracket was originaly a magnesium casting for Honda Racing which was supplied in a kit along with carbs and lots of other goodies.

You can use a standard bracket by maching off the "Lump" that goes against the normal slidetr and using spacer(s) to get the bracket to bolt on the opposite slider in the correct alignment.  If you dont want to do this you need a pair of later forks that can use the bracket you pictured
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Offline El__burro

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Cb750 dual disk upgrade
« Reply #36 on: June 27, 2015, 08:38:27 PM »
that picture is so porn.
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Offline El__burro

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Re: Cb750 dual disk upgrade
« Reply #37 on: June 27, 2015, 08:44:42 PM »

Quote from: Bryanj on June 27, 2015, 07:38:29 PM

You can use a standard bracket by maching off the "Lump" that goes against the normal slider.

i thought about this option but not sure if it weakens the arm somehow.
ive been looking online but no success.
what is a decent gap?

starting to see the way out of this.

thanks
el__burro
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Online Bryanj

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Re: Cb750 dual disk upgrade
« Reply #38 on: June 28, 2015, 12:25:15 AM »
Machining and spacers is the way that 98% of the early twin brake conversions were done as nobody could afford the Honda Kit!!!
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Offline El__burro

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Cb750 dual disk upgrade
« Reply #39 on: June 28, 2015, 12:36:07 AM »
i guess thats my same route.
just studying on a spare one ive got.
probably shaving up to the 4th shim could do.
thanks


el__burro
« Last Edit: June 28, 2015, 01:08:37 AM by El__burro »
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Online Bryanj

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Re: Cb750 dual disk upgrade
« Reply #40 on: June 28, 2015, 01:16:43 PM »
Those look like spring washers, you would be better off using flat ones or measure it and get a spacer made
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Offline El__burro

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Re: Cb750 dual disk upgrade
« Reply #41 on: June 28, 2015, 01:21:43 PM »
Yeah I know, it was just to get an idea.
I have bought enough flat washers now.
Tomorrow I'll be starting to shave the "lump" off the calliper arm (the red bit)

Thanks
El__ burro
« Last Edit: June 28, 2015, 01:24:34 PM by El__burro »
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Online Bryanj

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Re: Cb750 dual disk upgrade
« Reply #42 on: June 28, 2015, 05:25:40 PM »
You should not have to shave those bits, I meant the lump under the bolt head that holds it to the leg. Try adding slightly more spacer so that those red bits just clear
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Offline El__burro

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Re: Cb750 dual disk upgrade
« Reply #43 on: June 28, 2015, 08:03:34 PM »
what lump under the bolt head?

Do you mean the part in red in the pictures?

thanks
el__burro
« Last Edit: June 28, 2015, 08:34:16 PM by El__burro »
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Online Bryanj

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Re: Cb750 dual disk upgrade
« Reply #44 on: June 29, 2015, 04:33:35 PM »
No the one on the bracket directly under the bolt head
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