Author Topic: 1975 CB 750K caliper holder  (Read 2329 times)

0 Members and 3 Guests are viewing this topic.

Offline albertaboy

  • No way I'm a
  • Hot Shot
  • ***
  • Posts: 396
1975 CB 750K caliper holder
« on: April 09, 2011, 12:41:13 PM »
Hello

Can anyone tell me which one of these is for a 1975 CB750K?.  I think the picture shows the differences between the two. The top holder being thicker than the bottom holder (where the caliper bolts on) is the major difference, otherwise, mounting holes line up.  I suspect the top one is for a supersport, but not sure.  Thanks again.
1975 CB750K
No where to go and all day to get there.
My build thread: http://forums.sohc4.net/index.php?topic=131424.0

Offline albertaboy

  • No way I'm a
  • Hot Shot
  • ***
  • Posts: 396
Re: 1975 CB 750K caliper holder
« Reply #1 on: April 09, 2011, 01:24:56 PM »
Hello

Can anyone tell me which one of these is for a 1975 CB750K?.  I think the picture shows the differences between the two. The top holder being thicker than the bottom holder (where the caliper bolts on) is the major difference, otherwise, mounting holes line up.  I suspect the top one is for a supersport, but not sure.  Thanks again.

Ok Just thought of ebay and thru it I found pictures that tell me the top pictured holder is from a Cb400 or so bike.  Anybody want to buy it?  lol  anybody got a 75 CB 750K caliper holder for sale?   The hunt is on.   
1975 CB750K
No where to go and all day to get there.
My build thread: http://forums.sohc4.net/index.php?topic=131424.0

Offline scottly

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,296
  • Humboldt, AZ
Re: 1975 CB 750K caliper holder
« Reply #2 on: April 09, 2011, 03:46:41 PM »
What is the distance between the caliper mounting holes? On the 750s it's 50 mm center to center; the smaller bikes are less, but I don't recall the actual measurement. The top arm looks similar to a K7-K8 750 arm.
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline cobra2411

  • Enthusiast
  • **
  • Posts: 197
Re: 1975 CB 750K caliper holder
« Reply #3 on: April 09, 2011, 04:16:35 PM »
The thin one takes the finned caliper. That is assuming the hole spacing is the same.

Offline scottly

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,296
  • Humboldt, AZ
Re: 1975 CB 750K caliper holder
« Reply #4 on: April 09, 2011, 05:40:51 PM »
The thin arm on the bottom looks different than a K1 750 finned caliper arm. The curve on the bottom is greater, and the area around the adjuster hole is different.
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline albertaboy

  • No way I'm a
  • Hot Shot
  • ***
  • Posts: 396
Re: 1975 CB 750K caliper holder
« Reply #5 on: April 09, 2011, 07:00:59 PM »
What is the distance between the caliper mounting holes? On the 750s it's 50 mm center to center; the smaller bikes are less, but I don't recall the actual measurement. The top arm looks similar to a K7-K8 750 arm.

Good info. I never measured but did set one on top of the other and the holes lined up. No subsitute for a measuring tape- i'll have a look
tomorrow. thanks. 
1975 CB750K
No where to go and all day to get there.
My build thread: http://forums.sohc4.net/index.php?topic=131424.0

Offline albertaboy

  • No way I'm a
  • Hot Shot
  • ***
  • Posts: 396
Re: 1975 CB 750K caliper holder
« Reply #6 on: April 09, 2011, 07:09:33 PM »
The thin one takes the finned caliper. That is assuming the hole spacing is the same.

I read in your post that your collecting parts for a dual disk set up.  So am I.  Unfortunately, I tore by bike apart, threw both of these into a box and forgot about them til now.  Now I cant recall which one came off my 75 750K.  My bike has a finned caliper so now I suspect the bottom holder is mine.  The caliper mounting holes appear to line up so then I bet it then the top holder pictured is a 750F holder.   I'll measure tomorrow but I'm sure my caliper will mount to it.
1975 CB750K
No where to go and all day to get there.
My build thread: http://forums.sohc4.net/index.php?topic=131424.0

bollingball

  • Guest
Re: 1975 CB 750K caliper holder
« Reply #7 on: April 09, 2011, 07:15:29 PM »
alberttaboy tag and bag you never know when you will get back to it ;D

Offline cobra2411

  • Enthusiast
  • **
  • Posts: 197
Re: 1975 CB 750K caliper holder
« Reply #8 on: April 09, 2011, 07:47:18 PM »
Not counting the 77-78 f there are 3 caliper brackets (holder), k0-k2 with the finned caliper, k3-k5 with the finned caliper and k6-k8, f0-f1, & a with the plain 42mm caliper. So the finned caliper will fit later bikes with the k3-k5 bracket. The k0-k2 bracket only works with the finned caliper and you can't do dual brakes. The bracket for the finned calipers is 10mm thick. The later 42mm caliper is 17mm thick. The distance between the mounting holes is 50mm. If the bracket in the picture is 10mm thick where the caliper mounts its a k3 bracket and takes the finned caliper.
« Last Edit: April 09, 2011, 09:06:56 PM by cobra2411 »

Offline scottly

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,296
  • Humboldt, AZ
Re: 1975 CB 750K caliper holder
« Reply #9 on: April 09, 2011, 08:05:49 PM »
The k0-k2 bracket only works with the finned caliper and you can't do dual brakes.
???
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline hesselfuzz

  • Full Member
  • *
  • Posts: 66
Re: 1975 CB 750K caliper holder
« Reply #10 on: April 09, 2011, 08:13:05 PM »
Hard to tell from the pics but the top on does, indeed, look like an F caliper bracket. The bottom is probably the one for your '75 K model.
Moderation is a fatal thing, the only success is in excess.  -Oscar Wilde
73 CB750k
78 CB750ss
70 CB750k
06 Buell Ulysses

Offline albertaboy

  • No way I'm a
  • Hot Shot
  • ***
  • Posts: 396
Re: 1975 CB 750K caliper holder
« Reply #11 on: April 09, 2011, 08:24:17 PM »
alberttaboy tag and bag you never know when you will get back to it ;D

Doh....  :-[  I know better too. lol. Cheers!.
1975 CB750K
No where to go and all day to get there.
My build thread: http://forums.sohc4.net/index.php?topic=131424.0

Offline albertaboy

  • No way I'm a
  • Hot Shot
  • ***
  • Posts: 396
Re: 1975 CB 750K caliper holder
« Reply #12 on: April 10, 2011, 02:31:54 PM »
Not counting the 77-78 f there are 3 caliper brackets (holder), k0-k2 with the finned caliper, k3-k5 with the finned caliper and k6-k8, f0-f1, & a with the plain 42mm caliper. So the finned caliper will fit later bikes with the k3-k5 bracket. The k0-k2 bracket only works with the finned caliper and you can't do dual brakes. The bracket for the finned calipers is 10mm thick. The later 42mm caliper is 17mm thick. The distance between the mounting holes is 50mm. If the bracket in the picture is 10mm thick where the caliper mounts its a k3 bracket and takes the finned caliper.
Just to follow up, both holders measure up as you wrote here.  Both caliper mounting holes measure 50mm.  The thick one is 17mm across and the thin one is 10 across.  As I'm converting to dual disk it I'm searching for another K3 bracket.  Thanks for everyones help on this!! ;D
1975 CB750K
No where to go and all day to get there.
My build thread: http://forums.sohc4.net/index.php?topic=131424.0

Offline cobra2411

  • Enthusiast
  • **
  • Posts: 197
Re: 1975 CB 750K caliper holder
« Reply #13 on: April 11, 2011, 08:05:28 AM »
There's a complete K3-K5 setup on ebay right now. caliper, holder, master, etc.

http://cgi.ebay.com/ebaymotors/HONDA-CB750-K-DISK-BRAKE-CALIPER-MASTER-CYLINDER-K1-K2-/330550292611?pt=Motorcycles_Parts_Accessories&hash=item4cf6553083#ht_5338wt_1165

I posted this in the ebay section of the classifieds too.