SOHC.co.uk Forums > CB500/550

CB550 1977 F2 twin disc conversion

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Bryanj:
I mean the alloy disc carrier or holder that the disc is riveted too and is bolted to the hub.
Machining the drive flat and securing it withcountersunk screws will work but you have to get it exactly central you dont use the chrome plate and the drive must fit inside the hole of the disc carrier

Sesman:
Ok, thanks both. Surprising there is no improvement over 1 disc….at least logically if not practically! Obviously I’m a novice on braking physics.

I now need a new Speedo drive as the flat retainer theory will not clear the drive body with pan head screws. Any decent second hand sources, DS and CMNSL is prohibitive.

Oh Lordy.

Sesman:
Hi Julie.

Iv’e drilled down Trigger’s build and it seems that he has used the earlier symmetrical hub with flat sides rather than the later asymmetrical ‘round’ hub design. So his solution won’t work On a ‘round’ hub unfortunately.

Think I’ll shim the Speedo drive by 0.25mm to clear the slightly raised heads on the countersunk screws, but if I can get my hands on a new retainer I’ll opt for Bryanj’s solution and machine two small indentation’s on the back of the disc carrier to accept the original retainer drive tabs.

So finally, anybody know of a non mainstream course for a new retainer?

Cheers

P

Sesman:
Hi, Oddjob.

That really is weird as the knock pin heads would touch either the drive seal or the Speedo drive body. I know cos I tried it.

My boy is a 550 F2 with the later asymmetrical ‘round’ hub. When tightening the axle the Speedo drive binds on any protuberances on the drive ring. The clearance is very small indeed, probably less than 0.5mm, but I’ve yet to measure it. I didn’t notice when I tightened the axle, but all became clear when I tried to roll the bike :-\.

Promise I’ll,, not mention a replacement drive ring again…. ;D

Bryanj:
 The drive is same on 750/550/500(4 and twin) and i think 400&350

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