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Intermittent noise when riding, could it be my chain?

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Craizeehair:
I took the bike down to the Ace Cafe the other week and noticed a noise coming from the bike, if I had to describe it I would say it sounded like a chain or belt catching, rubbing, chafing?

It’s not constant, it comes and goes and it does seem to keep time with the momentum of the bike moving and doesn’t do it when stationary.

I’ve pulled the chain guard off and there are marks there that to me, look like the chain could have been catching, not serious gouges but definitely marks, not the easiest to catch on the phone camera.

I also removed the rear crank case cover and there is definite wear marks, is this normal, I presume (probably wrongly) that is quite normal, hence the rubber?

Are there any issues known or things I should be looking at and checking. I’m not sure the noise is the chain, so I’m open to suggestions, I realise it’s hard, if not nearly impossible to fault find blind or ver the internet but if anyone has suggestions as to what it could be or anything with checking I would be grateful.

There is about 15-20mm play on the chain.

K2-K6:
Fairly normal to have those mark in the rubber, as you note, it's there to stop it rattling on the aluminium.

A thought though. Have you checked chain slack at multiple points ? If its uneven (sometimes when contemporary you'd get a chain that was significantly different in dimension along different parts) to make it flap up and down, hitting the guard variously.

Worthwhile checking to see if there's any inconsistency present.

Craizeehair:
Thanks for the reply, if it is inconsistent then I presume that’s a new chain?

K2-K6:
If you find anything significant, then also include rear sprocket for concentricity to eliminate that part.

Sometimes you can here quite clearly when someone pulls away from a bike meet or similar a pulsing noise as they rotate the wheel.

If the chain is definitely bad, then not much option but to replace.

If it did in any way appear to be corrosion linked (chain pins etc) then trying a EP gear oil application could be effective. GL5 rated is very good on chains and has not much smell like older oils of this type are characteristic in pong.

Hopefully detailed inspection will confirm if there's anything to be acted apon.

Craizeehair:
I checked the chain and it was 15-20mm in places and very tight, maybe 5-10mm in others. I slackened it right off and started again. It’s now pretty much 20mm, not exact everywhere maybe 15mm in places?

I took the bike out today without the front sprocket cover or chain guard, I did just over 60 miles and didn’t hear a peep so I’m hopeful it is that.

My question now is, if I put the cover and chain guard back on and it starts again, what would be next steps… New chain and sprockets?

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