SOHC.co.uk Forums > CB500/550

Bearing shells, main, code markings

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Bryanj:
If you are good with a mic measure the crank pins, sizes for codes are in the manual

Bigbird:
Thanks for replying! I now found the markings on case under the paint! CCBBC

Also, can anyone help me to what the mark on the crankshaft says? Looks like it says UG, is this to determine shellsize?





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McCabe-Thiele (Ted):
Nope the crank markings for the big ends are on the curved side of the crank in black.
That UG is probably just a casting batch number for the crank, your codes C.C.B.B.C  look strangely spaced. They give you one axis in the parts book the first letter on the left is for number one mains. You need to find a colour code on the side of the shells. If they are not visible you need to measure the mains journals very accurately. That will give you the colour code - there are no real shortcuts. You could buy one set of say brown shells then use Plastigauge of the right range to measure the clearances.
Those marks on your crank big end are not good, I would clean them with petrol and check them all.

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