SOHC.co.uk Forums > CB500/550

Main bearings

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masonmart:
The CB550 has a code on the crankcase (A,B,C) based on main bearing support ID measurement and a mark on the crank (1,2) based on crank journal dia and from these codes any one of 4 main bearings (brown, black, green, yellow) can be selected to fit well.

None of the usual outlets like CMSNL or Dave Silver have all 4 bearings.

If you damage a crankcase and wish to replace it say with one from a breaker but the existing main bearings aren't compatible with the casing ID's is there anything that can be done if you can't buy the correct main ?

Are there any other outlets that may make Honda main bearings now?

Trigger:
Go for a full set of Black or Green with a bit of graphogen and run in. That's if you can get them.

Rozabikes Tim:
Ok show myself up as the ameteur I am. What is graphogen?

royhall:
Its a Graphite based assembly paste. The hype says an engine built with just Graphogen can run without oil for a while. Wouldn't try that myself though. I've used it a bit now since Trigger recommended it and its bloody good stuff. Expensive as well.

Rozabikes Tim:
So would one apply it to bearing surfaces only in crank and cam. Or cam lobes / followers too etc?

Just googled price. Jesus it better be good! Take it you dont need much per build though?

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