SOHC.co.uk Forums > CB650

Is this normal chain wear?

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Sesman:
Drop the sump and also inspect the oil pump and filter.

Bryanj:
Rebuilt? By who and how and what was replaced plus was it set up.correctly afterwards, especially the cam chain adjustment. Those marks look new and shiny so i would say were recent and done by this chain and to my mind that compromises the chain. Sorry

Sesman:
As a minimum I’d drop the sump and inspect the primary chain, filter and oil pump.

Veedunk:
Ok I’ve dropped the sump, removed the oil filter and removed the oil pump…
There are very, very fine metal particles in the oil filter and the oil from it, same with the oil pump, if I didn’t know better I probably wouldn’t have noticed them. However when I drained the oil from the sump there were some bigger particles which I’ve tried to show an example with the photo, but certainly not much considering the amount of wear.
I don’t know what to look for on the primary chain if I’m honest, it looks normal to me.

As for what was rebuilt by the last owner, I don’t really know, but I will try and find out.

The bike has always run well but not been as quick as I would have expected but I don’t have anything to compare it with as I’ve always had modern bikes. Would this sort of wear prevent the bike from revving fully as its always sounded like it’s screaming at about 6000rpm?

K2-K6:
There's something very and distinctly unusual about that chain and wear in first picture, maybe give us a clear picture of the chain stretched out and a picture of the cam sprocket to help opinion of what's really going on there.

A "Hyvo" type if ever fitted doesn't ordinarily have a centre set of link plates running along the chain (unless that first picture has two runs next to each other as it lays there) it certainly looks wrong from that picture.

Generally a Hyvo will have sprockets looking like small gear teeth rather than the curved bottom form of conventional link chain hardware.

Unusual to touch the sides of castings to to anything of that degree illustrated.

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