SOHC.co.uk Forums > CB500/550

Main bearings

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Trigger:
Any surface that needs bedding in, some engine builders even use it on the bores and pistons but, I prefer oil on those parts.

masonmart:
The crankcase codes are CBBBC as stamped on the rear of the crank cases and the crankshaft journals are all 1.2995" dia (32.99mm) so I need 2 B (brown) bearings and 3 C (green) bearings. I can see the bearings at DS but the manual says not to use the letters stamped on the cases although these would seem to align with main bearing codes and the number of letters matches up.

I guess that the only way is to measure the main bearing slots in the crankcase and use the measured value rather than that stamped on the cases?

Bryanj:
Use the case stampings as the cases dont wear(unless the shells sieze to the crank and spin), its the crank journals that wear and then rarely

Gixxer-18:
Just to Clarify; the Crankcases don't wear; unless the bearing siezes and spins the half bearings in the Crankcases,
The Crankshaft wears; and the Bearings wear.
You disassemble the Crankcases, and measure the wear with Plastiguage.
That tells you the wear on your crank main journals.
You select new Journals from the FSM to fit your crankshaft wear.
You go online to buy new Journals. But the usual suppliers don't have all the colours you need.
What can you do?
Probably your old half shells have more than enough meat on them to reuse!
Clean Oil, regular oil changes and TLC  will keep your engine going for another 40 yrs!
HTH
NIGEL.

masonmart:
I'm talking bollox sorry, the crank journals are diameter 2 and for C2 and B2 I need Black and Brown respectively not Brown and Green.

The part number for the black bearings is 13315-323-000 but so far I can't see any anywhere.

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