Honda CB750 Sandcast

The Restoration Shop => Brakes => Topic started by: markb on August 24, 2015, 09:24:57 am

Title: I need help identifying early rear brake arm
Post by: markb on August 24, 2015, 09:24:57 am

Somehow I missed the rear brake arm when I did my chrome plating.  Now I’m not sure which brake arm is the original.  Can anyone tell me what the characteristics of the early brake arm are?

Here are the 4 that I have.  They’re in the same location left to right in all pictures.  The left most one has a slight curve in it and also notice the differences in the left side of the clamp area.
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01731.JPG)

Here the curve is more apparent in the left one.  The other three are straight.  The left two have raised numbers on them.
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01732.JPG)

Quite a bit of variation in this view on the clamp ends.
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01733.JPG)

Some subtle differences here in the size of the radius where the round end blends back to the straight arm.
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC01734.JPG)

Title: Re: I need help identifying early rear brake arm
Post by: Erling on August 26, 2015, 04:15:18 am

On 1676 rear brake arm is straight.
No numbers on the back.
Eye seems to be off set a bit to the fore, some 2 mm.
I.e. a ruler along the rear arm edge and round part is 3mm further rear and along front edge 5mm to the fore!
     Erling.

Title: Re: I need help identifying early rear brake arm
Post by: markb on August 26, 2015, 07:57:38 am

Thanks!  I still can't believe I just put them all in a box without labeling them.  Anyone else have any observations?

Title: Re: I need help identifying early rear brake arm
Post by: Sgt.Pinback on October 31, 2016, 12:33:01 pm

Here is my collection.

The brake arm from SC # 1983 (the one on the far right; figures gibe gr) is heavier than later ones, has no number on the back and  a rough surface the back.

On the front side, there is a rectangular sign, that I cant see on Marks eary SV brake arm.

Title: Re: I need help identifying early rear brake arm
Post by: Sgt.Pinback on October 31, 2016, 12:34:41 pm

Back side pic.

Title: Re: I need help identifying early rear brake arm
Post by: Steve Swan on October 31, 2016, 01:14:36 pm

i would pick the 3rd door from the left, i think the other 3 are tigers.  232 and 2157 are both smooth on backside, no letters or numbers.