Is this normal chain wear?

[Veedunk]

Hi, I’ve taken my cylinder head off due to trying to find an oil leak…I’m about to replace the gaskets/seals and hope that fixes the problem but before it all goes back I wanted some advice about these chain marks? Is that normal wear to the inside of the head and the barrel casing?
Many thanks

[Bryanj]

No either the tensioner isnt workinh and/or the cam chain is worn out

[Johnny4428]

Looks like a good candidate for a strip complete strip down.

[florence]

erm, good job you took it apart.

[Bryanj]

Yup its a full strip, there is no link on those hyvo chains, i know they must have been assembled in the first place but those pins always look twisted at the ends to me

[Nurse Julie]

Yup its a full strip, there is no link on those hyvo chains, i know they must have been assembled in the first place but those pins always look twisted at the ends to me

The cam chain isn't a Hyvo Bryan but the primary chain is 😊😊😊

[Bryanj]

 Im sure the 650 has a small hyvo camchain lick the 250N

[Nurse Julie]

Im sure the 650 has a small hyvo camchain lick the 250N

Indeed you are probably 100% correct and I apologise. I didn't see that it was a 650 and I've never seen a complete 650 in person ever, let alone the innards of the 650 engine 😊😊😊😊

[Bryanj]

No need for appologies Julie, the day we stop learning is the day we give up! Just for info the 650 is a stroked 550 not a bored one

[Veedunk]

Thanks for all the replies, not the answer I was hoping for though!
Before I go ahead and strip it down, do you think these could be old wear marks? I’m only asking because I bought this bike a year ago after a full rebuild during lockdown by the previous owner, it’s probably done less than 1000 miles since then.
I will drain the oil today and see what sort of condition it is in.
Thanks again

[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.