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Jumping chain

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Richtea
Trackday Trickster



Joined: 15 Nov 2011
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PostPosted: 09:39 - 19 Jun 2012    Post subject: Jumping chain Reply with quote

Hi,

Just cleaning my chain this morning and let it run on idle in 1st gear just to circulate the oil.

The chain seemed to be jumping around a bit (video below). Is this anything to worry about?

I would hope that it is just because the chain is not under any load, as when I pick the revs up it seems to be fine.

Any reassuring comments?

https://youtu.be/5140l7KSnj0

Ps. Chain seems to be correctly tensioned
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recman
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PostPosted: 09:50 - 19 Jun 2012    Post subject: Reply with quote

Stiff links. Wink
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doggone
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PostPosted: 09:57 - 19 Jun 2012    Post subject: Reply with quote

Fairly normal I'd say, a new one might run smoother but as you thought it's the un-natural situation of no load plus running at tick over doing it.
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cb1rocket
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PostPosted: 12:55 - 19 Jun 2012    Post subject: Reply with quote

its the pulses from engine running characteristics. Every time the engine fires it does a sharp jolt then it slows down again You don't really notice this on the tacho because its so minor adjustment of engine speed.

Rev it a bit higher and watch again, it will smooth out.

Chain is fine anyway
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Richtea
Trackday Trickster



Joined: 15 Nov 2011
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PostPosted: 13:11 - 19 Jun 2012    Post subject: Reply with quote

Thanks for all the info, looks like its nothing to worry about then.

Thanks again, help is appreciated.
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Benson_JV
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PostPosted: 14:47 - 19 Jun 2012    Post subject: Reply with quote

When I bought my first bike, the CBR, it did this. I went out & bought a new chain & sprocket set as I thought it meant the sprockets were forked. Laughing
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Ed Case
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PostPosted: 20:31 - 19 Jun 2012    Post subject: Reply with quote

Normal, on tickover the motor runs slightly uneven which makes the final drive sprocket 'snatch' causing this effect.
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mentalboy
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Joined: 05 May 2012
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PostPosted: 18:18 - 20 Jun 2012    Post subject: Reply with quote

If you've got any concerns in this area try this!
Get some good old fashioned oil on it, if it's got a split link even better - get it off and soak it overnight, won't hurt to work it in with a scabby brush. Then leave it on some newspaper to get rid of most of the excess. After this it should be easy to check along it's length for tight spots, which may loosen up if you work them back and forth. Whilst it's off you could look up stretch tolerances for it and see if it's not overly stretched.
If you say it's correctly tensioned then go to rear sprocket and try to lift a chain link off the sprocket, the more it lifts off the sprocket the more likely you're going to need a new chainset.
Check the teeth on the sprocket for mishapes - always easier to reference against a new one if you're not sure what they should look like. But if you can use it to hook fish with or they finish in a nice sharp point then again you'll be wanting a new chainset.
Whenever you replace a chain always do the sprockets as well - you'll only end up knackering the new bit in double quick time.
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paddlesat16
Crazy Courier



Joined: 07 May 2008
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PostPosted: 18:41 - 20 Jun 2012    Post subject: Reply with quote

I think you have worn cush rubbers and a worn chain as well. You get sloppyness as the rear sprocket moves backwards and forwards in its hub.

Regards
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orac
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PostPosted: 19:06 - 20 Jun 2012    Post subject: Reply with quote

that normal for good old gs5s on tickover (from sound and what i saw of it) as said before its the engine pulses as it fires.

its does this while it being riden just not to that extent. you alos have to realise that there will be extra slack in the chain from it being on the main stand

oh and give your chain a good clean next time, as you clean it you can inspect it for stiff link and alike at the same time
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Richtea
Trackday Trickster



Joined: 15 Nov 2011
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PostPosted: 22:15 - 20 Jun 2012    Post subject: Reply with quote

Cheers guys,
I'm gonna give the chain a going over tomorrow so I'll check all your suggestions.
Thanks Thumbs Up
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Old Thread Alert!

The last post was made 13 years, 12 days ago. Instead of replying here, would creating a new thread be more useful?
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