SOHC.co.uk Forums > CB500/550

What color bearing do I need?

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royhall:
Good point about just using black shells Oddjob wouldn't do that myself.

I usually don't measure the cases as the sizes of the bores are clearly marked on the cases and unless a shell has spun they are not going to change as they are not subject to wear. On the other hand the crank journals are subject to years of wear making the original marks irrelevant. Even Honda themselves say not to use them, as in Ash's earlier post.

They should be carefully measured for size, ovality, and uniformity across the whole journal as well as checking for surface finish and scoring.

It is possible for an experienced precision engineer to use a micrometer and slip gauges to measure the crank to one tenth of a thou as long as it's at room temperature (and you don't use a digital micrometer). It's important to use the size it actually is now, rather than a note of what it was 40 years ago.

I was able to find the marks on my last two cranks (350F & CB750K4) and, although they were close, neither of the cranks exactly matched the actual sizes to the markings.

royhall:
I agree OddJob, money money.

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