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Front sprocket problems

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natefz6
Brolly Dolly



Joined: 06 Apr 2005
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PostPosted: 12:57 - 02 Oct 2019    Post subject: Front sprocket problems Reply with quote

Hey all,

I was riding to work the other day and the front sprocket felt like it was catching. On the way home any sign of catching had gone but I took the cover off to have an inspection as to what might have been going on.

The Sprocket looks like this;
https://i.imgur.com/2kz0LVN.jpg

My first though that the chain might be slack but it was not as slack but it seemed to be ok. I then thought it might be wheel alignment. I have measured between the swing arm pivot and the axle and this seems to be good too. I was going to set up a string test but I dont have a center or paddock stand currently.

Looking at the chain positioning though and pushing the bike round the garden it always seems to sit right on the front face of the sprocket. Is this normal?

Chain looks to be OK I think, it comes away from the rear sprocket about 2mm when pulled and you cant see light through it. no tight spots that I can find

Any ideas?

I know its looking a bit dry so I will lube it up.

Cheers!
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 13:09 - 02 Oct 2019    Post subject: Reply with quote

The teeth are starting to hook which means the chain is on it's way out too. Time for new chain and sprockets, and of course chain lube.

There's so little build-up of mess around that front sprocket that shows you've been badly neglecting the chain through lack of lube.

Chain and sprocket set: £150
6 months worth of Rock Oil chain lube £15

You don't even want to think about the cost of replacing the engine cases if that chain breaks at a seized pin through extended neglect.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 13:17 - 02 Oct 2019    Post subject: Reply with quote

As above, hooked teeth will be hanging up. Time for a new one.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 13:23 - 02 Oct 2019    Post subject: Re: Front sprocket problems Reply with quote

natefz6 wrote:
The Sprocket looks like this

Is there a bright wear ring on both sides, or just the front?

And as above.

To chack your wheel alignment you can use a long straight edge, e.g. a board (look along it first to check it is straight!).
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natefz6
Brolly Dolly



Joined: 06 Apr 2005
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PostPosted: 13:33 - 02 Oct 2019    Post subject: Re: Front sprocket problems Reply with quote

Riejufixing wrote:
natefz6 wrote:
The Sprocket looks like this

Is there a bright wear ring on both sides, or just the front?


It does not seem to be at the back as far as my fingers can tell. I have not taken it off though and cant see behind it.

I was thinking in my head that this chain was newish, but after checking my history its coming up to 2 years old and I have done just over 20k in that time.

Not a bad run I guess.

Nevermind time for a trip to FWR and get the scotoiler sorted as its stopped dripping.

Cheers all.
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Hong Kong Phooey
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Joined: 30 Apr 2016
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PostPosted: 14:58 - 02 Oct 2019    Post subject: Reply with quote

Check sprocket and wheel alignment, rear spacers when fitting.

As you noted already the shiny wear is heavy on the front face of the front sprocket and not on the back of it. Might have one adjuster set further back than t'other or rear spindle has slipped.
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Polarbear
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Joined: 24 Feb 2007
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PostPosted: 10:11 - 03 Oct 2019    Post subject: Reply with quote

I agree with the above, new chain and sprockets and check spacers and alignment.

Something is certainly not right with that wear pattern, lube or no lube.
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Easy-X
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Joined: 08 Mar 2019
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PostPosted: 10:28 - 03 Oct 2019    Post subject: Reply with quote

Don't forget to take a photo of the other side of the sprocket when you take it off so we can all have a good laugh learn from this Smile
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