Author Topic: Chain sounding noise  (Read 1154 times)

Offline RoyC

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Chain sounding noise
« on: 13.07. 2017 18:15 »
My bike was collected yesterday to have chair fitted but as we were pushing the bike to the van we noticed a noise just like when you are changing gear on a push bike when the chain is trying to go onto the next cog, but more of a cracking sound.
The chain had the 1/2 inch up/down play when on the centre stand and the same on the primary chain.
Does the chain tighten up when it is off the centre stand ?
My bike is a 1958 A7SS
Staffordshire UK

Offline ellis

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Re: Chain sounding noise
« Reply #1 on: 13.07. 2017 18:24 »
Sounds like either the chain has stretched or the sprockets are worn to cause this noise.


ELLIS

Offline RoyC

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Re: Chain sounding noise
« Reply #2 on: 13.07. 2017 18:30 »
Sounds like either the chain has stretched or the sprockets are worn to cause this noise.


ELLIS
Thanks Ellis.
Funny thing is, when on stand with engine running and wheel freewheeling, not a sound.
When the bike comes back I will have to ride it around and see what happens.
Does the chain tighten up when it is off the centre stand ?
My bike is a 1958 A7SS
Staffordshire UK

Online JulianS

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Re: Chain sounding noise
« Reply #3 on: 13.07. 2017 19:19 »
Could be the chain rubbing on the rear chaincase.


Offline ellis

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Re: Chain sounding noise
« Reply #4 on: 13.07. 2017 19:48 »
Yes the chain does tighten up when you take it off the center stand. I sit on the bike and get someone to measure the free play. I usually go for about 1/2 " and that seems about right. Good luck RoyC.

ELLIS

Offline RoyC

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Re: Chain sounding noise
« Reply #5 on: 13.07. 2017 21:02 »
Yes the chain does tighten up when you take it off the center stand. I sit on the bike and get someone to measure the free play. I usually go for about 1/2 " and that seems about right. Good luck RoyC.

ELLIS
That could be my problem then ellis as I set the 1/2 inch when on the stand
My bike is a 1958 A7SS
Staffordshire UK

Offline RoyC

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Re: Chain sounding noise
« Reply #6 on: 13.07. 2017 21:04 »
Could be the chain rubbing on the rear chaincase.

It's not a rubbing sound Julian, more of a cracking sound.
My bike is a 1958 A7SS
Staffordshire UK

Online chaterlea25

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Re: Chain sounding noise
« Reply #7 on: 13.07. 2017 21:56 »
Hi,
The chain is tooooo tight  *eek* *eek* *eek* *eek*

Where did you come up with 1/2in for the final drive chain??  *conf2*

John
1961 Super Rocket
1963 RGS (ongoing)

Offline Slippery Sam

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Re: Chain sounding noise
« Reply #8 on: 14.07. 2017 08:04 »
Roy,
Your rear drive chain will need more than 1/2 inch and needs to be done on the ground.  Unless you have a modern superbike where the engine sprocket is on the same axis as the swing arm (which the BSA doesn't have - it's a good bit in front of the S/A pivot) - the chain will tighten when the suspension moves.
1/2 inch slack on the stand will result in the chain being stretched when you sit on the bike or the suspension moves.  I know some literature might suggest 1/2 inch - I'd always give it more than that.
good luck Raymond.
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Offline duTch

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Re: Chain sounding noise
« Reply #9 on: 14.07. 2017 08:29 »
 
Quote
  When the bike comes back I will have to ride it around and see what happens.

 Ffs don't do that; that's the kinda dumb shit I'd  do. ... *eek*

 I agree with the above re; ' too tight', but as you've already sent it off elsewhere,  you could maybe at least chase it up and loosen the axle,  back off the adjusters incrementally and equally, (to maintain their alignment) *ex* until there is at least some slack on the chain, then nip it up until you can check it properly
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline bikerbob

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Re: Chain sounding noise
« Reply #10 on: 14.07. 2017 08:44 »
On a swinging arm model according to the handbook the total free movement of the rear chain should be 1 1/4 inches which reduces quite a bit when off the stand.

Offline RoyC

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Re: Chain sounding noise
« Reply #11 on: 14.07. 2017 09:32 »
Hi,
The chain is tooooo tight  *eek* *eek* *eek* *eek*

Where did you come up with 1/2in for the final drive chain??  *conf2*

John
I'm probably mixing it up with how much slack to give a fan belt on the car  *red* *doh*
My bike is a 1958 A7SS
Staffordshire UK

Offline RoyC

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Re: Chain sounding noise
« Reply #12 on: 14.07. 2017 09:43 »
On a swinging arm model according to the handbook the total free movement of the rear chain should be 1 1/4 inches which reduces quite a bit when off the stand.

Thanks for this info, I think I will fit a new chain when the bike comes back.
What chain do I order ? The handbook states - Chain size and pitches :- Front = 1/2" x .305" 67 and Rear = 5/8" x 3/8" 98. whatever that means !!!!!!
My bike is a 1958 A7SS
Staffordshire UK

Online Greybeard

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Re: Chain sounding noise
« Reply #13 on: 14.07. 2017 10:03 »
On a swinging arm model according to the handbook the total free movement of the rear chain should be 1 1/4 inches which reduces quite a bit when off the stand.

Thanks for this info, I think I will fit a new chain when the bike comes back.
What chain do I order ? The handbook states - Chain size and pitches :- Front = 1/2" x .305" 67 and Rear = 5/8" x 3/8" 98. whatever that means !!!!!!

I imagine that the figures represent: Pitch, width and number of links.

I think you need to do something about the tight chain ASAP as it is putting a lot of strain on the gearbox bearings etc.

Offline a101960

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Re: Chain sounding noise
« Reply #14 on: 14.07. 2017 10:24 »
Quote
What chain do I order ?
Personally I would contact http://www.the-chain-man.co.uk/ What he does not know about chains is not worth knowing. As others have said the chain is best adjusted with the bike on the ground, in fact I always do mine this way and I also get someone to sit on the bike too.