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CB750 Caliper rattle

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steff750:
 ;) there are two sizes of shim in the parts list 0.1mm-0.2mm,that can be fitted between the lower part of the caliper and the caliper holder ,use either one or the other or even both as the parts list shows you can have any number of shims :o . i have seen this so many times that i would say that it was a common fault,and as the shims are not shown in the first parts list but they are in the fourth parts list . i would say that honda tried to correct the problem (bryan said there is a parts bulletin for it), and i have seen so many calipers without shims anyway. and yes i would say you would probably buy a secondhand one just has bad as yours. my advice would be get the shims and go from there,may aswell get the two orings while you are at it and grease the pin 8)

Lobo:
Steff - I think you've just fixed it! Thanks.

Whilst I do indeed have those O rings, there are no 0.1  / 0.2 mm washers. And whilst the slop appears  minimal at the carrier head it is not so at the caliper, ie seems I just now have to find those spacer washers......

Many thanks again,
Lobo

K2-K6:
Because they only rotate a very small amount it's unusual to get a significant wear on either component, but this is why they end up siezed when not greased.

If you are saying that the caliper support is moving by sliding up and down the pin, then shiming should be a reasonable way to cure that.

If the caliper support is moving in an arc i.e. the hole is too big for the pin, then the problem would seem more serious. Any plan to use a bush would be difficult as the material around this location is maybe not generous enough to make an adaption.

Lobo:
Hi K2-K6,

Agreed, and yes, it does move in an arc - suggesting hole wear? I figured if a spacer were slotted in between all mating faces then this would arrest any 'nodding' of the carrier. The fact that Honda show optional washers in the parts diagram, and Bryanj mentions a Bulletin, all attest to the fact that it may be a known problem. Surely Honda wouldn't bother supplying a washer to stop a 0.1mm slide up & down the pin - but I could see it as a preventative measure to minimise exagerated nodding at the caliper.

Have got to add, it is not as alarming as it all sounds... which is why I guess the MOT man wasn't concerned. I've had it all stripped down, there's no obvious wear, or signs of abuse etc. My main gripe is the odd clunk over bumps etc.

The bike was semi-restored when I bought it, and perhaps the carrier had been seized at some point and subsequent corrosion removal has taken material away too. In which case I'm up for a new carrier...
But will try a spacer first...
Cheers, Lobo.

Bryanj:
OK just finished another booze run and found the bulletin so here you are

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