Topic: Modern Brake Mod

[Dads Toy]

With parts for these old bikes are getting harder to find. And they are getting pricey. Has any one tried to find an aftermarket front brake caliper that could possibly mount up to these bike. You know like on some cars you can up grade the brakes to a Wilwood or Brimbo brakes. Or another bike manufacture and just cross it over to say a 1981 CB650C. Idea is to find something cheap that has parts available now.

[scottly]

The twin piston calipers used from about 1982 to 1987 are superior to the earlier single piston calipers, and can be fitted to '77F and newer 750 as well as 650 fork legs with the proper mounting bracket. The 32mm version found on V65 Hondas is close to a four piston Brembo in terms of piston surface area and hydraulic leverage. As I used a much larger disc, I had to fabricate an adapter to mount the bracket to the F2/F3 fork legs.
 

[754]

 I should add, that type of fork and the GL fork or any with that mount style are easy to adapt to.
 Easy milling job, but can be done on a drill press if you are clever.

[POPS 911]

SCOTTY: Could the dual calipers rear for the 82-87 be mounted on the rear of a 1978 SOHC 750A  [ on a rim with rear disc brakes ] like a line lock with a front left hand clutch lever from the GOLD WING holding it still [ no creeping ] no two steps allowed in ST/ET NHRA or MAN CUP. I have all the parts = rim, disc, lever, and swing arm ...... I also got a few DYNA TWO STEPS to cheat with.
POPS BK911

[scottly]

Hey Pops, I don't know about the '78 750A, but the twin piston calipers will bolt right onto a '77-78 750F with Comstars, with the correct bracket. Does the 'wing have a hydraulic clutch? If so, what is the diameter of the master cylinder piston?
Bill had a strong left-hand actuated rear brake on the Samauto, but I don't recall what parts he used, or how high they could rev the motor without creeping.
Scott

[MRieck]

Hey Pops, I don't know about the '78 750A, but the twin piston calipers will bolt right onto a '77-78 750F with Comstars, with the correct bracket. Does the 'wing have a hydraulic clutch? If so, what is the diameter of the master cylinder piston?
Bill had a strong left-hand actuated rear brake on the Samauto, but I don't recall what parts he used, or how high they could rev the motor without creeping.
Scott

Not very high unfortunately

[scottly]

Wasn't it about 4500 RPM?

[dunc]

Minor hijack but still on topic.

Are F and K sliders interchangeable? I ask because I have a racetech setup for my 77K forks and would like to swop on F sliders to easily utilize the newer dual piston brakes a dual brake setup.

[Sam Green Racing]

Wasn't it about 4500 RPM?

Not even close scottly.
We did try a different one to what we had and Bill got it to move from a stand still a lot quicker but that was in the paddock.
I can't remember why we ditched it but we did. I think it might have been because I was ET racing and not looking for quicker times.
The bike had a large CycleX rear disc conversion operated by a Busa clutch lever.
Go anywhere near 2500rpm and it would creep forward and red light.
I found it much more comfortable and consistent to hold it at 2000rpm and on the light, let it go and go to WOT at the same time.
Using this method, my times were normally within 8 100ths of a second of my dial in and it allowed me to concentrate more on cutting a good light. My best was 0.004.

Sam. 

[Jerry Rxman Griffin aka MuthaF'er]

Hey Pops, I don't know about the '78 750A, but the twin piston calipers will bolt right onto a '77-78 750F with Comstars, with the correct bracket. Does the 'wing have a hydraulic clutch? If so, what is the diameter of the master cylinder piston?
Bill had a strong left-hand actuated rear brake on the Samauto, but I don't recall what parts he used, or how high they could rev the motor without creeping.
Scott

Not very high unfortunately

Where's Jon when you need him?!