SOHC.co.uk Forums > CB500/550

Crank bearings good or bad

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Murf:
It’s a hard thing to determine from a couple of small photos but they are a bit grey and matt looking so would agree with the opinion about lack of oil changes, or possibly stood for a long time with old oil.  It would be helpful to have some photos of the crank journals to see what they are like. The journals should be smooth with no ridges or groves you can feel using your fingernail. Measure bearing clearance with plastigauge to see if they are within specification, if they are and crank journals are good then you have to make the call on the info you have.  I guess a full bearing change is in the region of £300-400, assuming you can get a full set of the sizes/colours you need. 
I will have exactly the same job and decision to make soon, I will be factoring the future usage that the bike will be having into my decision ie it’s going to have a pretty gentle well looked after life.

Bryanj:
Those pics are clearer and i agree with Julie, now i can see the knicks i would change that one

McCabe-Thiele (Ted):
Weird optical illusion on my phone with one bearing looking like it should - the second looking convex!

I need to go to Specsavers?

Acro1985:
I think after sleeping on it despite the cost if I can get a full set of bearing I will replace them as well as the Conrod shells, as I have no history for the bike or how long it been off the road. Plus someone has clearly had it apart before judging by the excess sealant that squeezed out everywhere.

So the next question is do I need to replace all the bearings for the gearbox shafts as they do seam to be is good condition

McCabe-Thiele (Ted):
If gearbox ball bearings are smooth when rotating with no visual signs of surface "pick up" only ones I would replace as matter of routine are the primary drive ones. Some of the special needle rollers are pretty much impossible to find.

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