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Uneven sprocket wear [message #218031]

Sat, 17 July 2010 22:03

viper_biker is currently offline

Messages: 702
Registered: November 2006
Location: Belfast

(6) 125 GP Racer

Has anyone any experience on this happen to them? 06 CBR1000, PVM wheels, JT steel rear sprocket and a DID chain. The chain is adjusted to the same on both sides so the only thing I can think off it the rear wheel hub being slightly incorrect. Am I worried over nothing or could the sprocket be on around the wrong way?

Outside

http://i21.photobucket.com/albums/b255/viper_biker/DSC_2080.jpg

Inside

http://i21.photobucket.com/albums/b255/viper_biker/DSC_2079.jpg

Chain adjusters,

http://i21.photobucket.com/albums/b255/viper_biker/DSC_2082.jpg

http://i21.photobucket.com/albums/b255/viper_biker/DSC_2086.jpg

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Re: Uneven sprocket wear [message #218040 is a reply to message #218031]

Sat, 17 July 2010 22:56

oldbastard is currently offline

Messages: 3858
Registered: June 2003

(11) MotoGP Podium Finisher

Hmm, that looks badly out of line. As you say, the sprocket might not be mounted right. Have you got the spacers in the right sides?

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Re: Uneven sprocket wear [message #218049 is a reply to message #218031]

Sat, 17 July 2010 23:21

DrMartin is currently offline

Messages: 4746
Registered: January 2004
Location: Boredsville

(13) MotoGP Champion

Don't trust the marks on the swing arm. You need a long straight edge up against the rear tyre and run it to the front wheel and measure the distance from the edge of the tyre on the front. Do this both sides and keep adjusting until the distance is the same both sides of the front wheel. I use a 2 metre spirit level. Thumbs Up

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Re: Uneven sprocket wear [message #218051 is a reply to message #218049]

Sat, 17 July 2010 23:26

SPAL is currently online

SPAL

Messages: 835
Registered: June 2009
Location: London

(7) 125 GP Winner

Shit,

I am probably the biggest butcher in London and I've never seen anything like that.

AS dr m says make sure everything is in line, have you had apart cause that wear is extreme, cant see the sprocket being the wrong way round would do that.

Major chain out of line issues?

Looks like that sprocket is made of marzipan.

Spal

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Re: Uneven sprocket wear [message #218081 is a reply to message #218051]

Sun, 18 July 2010 10:24

Yorkie is currently offline

Yorkie

Messages: 1180
Registered: August 2003
Location: North Yorkshire

(8) 250 GP Racer

Unlikely as it is are you sure the chain and the sprocket are of the same gauge??

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Re: Uneven sprocket wear [message #218082 is a reply to message #218081]

Sun, 18 July 2010 11:05

SP2 Riley is currently online

Messages: 3956
Registered: January 2008
Location: peterborough

(11) MotoGP Podium Finisher

Yorkie wrote on Sun, 18 July 2010 10:24

Unlikely as it is are you sure the chain and the sprocket are of the same gauge??

that's what i was thinking ie 520 and 525 dont mix so check the sprocket matches the chain Thumbs Up

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could be alignment issue too as its mostly one side.

measure from the swingarm pivot to the centre of the axel(trying to do it with a straight edge is pita) Wink

Wink

does the bike go right if you take your hands of the bars as it would if its a fair bit out.

unlikely on a new bike but check the swingarm bush bearings etc too for side to side play Thumbs Up

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Re: Uneven sprocket wear [message #218091 is a reply to message #218031]

Sun, 18 July 2010 13:35

viper_biker is currently offline

Messages: 702
Registered: November 2006
Location: Belfast

(6) 125 GP Racer

I've measured between the swingarm and wheel axle and both are pretty much spot on, sprocket and chain are all 530, the spacers are captive and is part of the hubs in the wheel. There's no play in the bearings either. I've not looked at the front sprocket yet as the clutch fluid is part of the sprocket housing. A friend said to me he'd a similar issue with his Dymags and it turned out to be the spacers needed changed. I'll be contacting Harris and PVM with photo's and will see what they say.

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Re: Uneven sprocket wear [message #218099 is a reply to message #218091]

Sun, 18 July 2010 16:16

SP2 Riley is currently online

Messages: 3956
Registered: January 2008
Location: peterborough

(11) MotoGP Podium Finisher

dymag have gone pop but that would figure if all is well on the chain sprox and bearings

have a look down the length of the chain and see if the front and rear sprox are out of alignment (there is a laser tool for this but you should be able to see it as you wear is extreme)

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Re: Uneven sprocket wear [message #218103 is a reply to message #218082]

Sun, 18 July 2010 17:39

DrMartin is currently offline

Messages: 4746
Registered: January 2004
Location: Boredsville

(13) MotoGP Champion

SP2 Riley wrote on Sun, 18 July 2010 11:05

measure from the swingarm pivot to the centre of the axel(trying to do it with a straight edge is pita)

No it aint. It's a doddle, and it works Tongue

Tongue

But I think this is a spacer issue, especially as they are after-market wheels.

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Re: Uneven sprocket wear [message #218104 is a reply to message #218031]

Sun, 18 July 2010 17:42

Quazi is currently offline

Quazi

Messages: 10668
Registered: March 2004
Location: Hiding behind Hadrian's W...

(21) Valentino Rossi

How tight is the sprocket carrier? Is there enough movement to cause some issues under acceleration stresses.

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Re: Uneven sprocket wear [message #218106 is a reply to message #218031]

Sun, 18 July 2010 17:54

Kermit is currently offline

Kermit

Messages: 15042
Registered: June 2003
Location: Leeds

(22) Giacomo Agostini

Hard to tell but on the outside (this pic) are the teeth worn thinner in the same was as is definitely clear on the inside?

http://i21.photobucket.com/albums/b255/viper_biker/DSC_2080.jpg

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Re: Uneven sprocket wear [message #218125 is a reply to message #218106]

Sun, 18 July 2010 19:50

SPAL is currently online

SPAL

Messages: 835
Registered: June 2009
Location: London

(7) 125 GP Winner

Hi kermit,

You can see on second picture of first post, there is no wear on inside of rear sprocket.

SPal

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Re: Uneven sprocket wear [message #218140 is a reply to message #218031]

Sun, 18 July 2010 21:14

Kermit is currently offline

Kermit

Messages: 15042
Registered: June 2003
Location: Leeds

(22) Giacomo Agostini

I was seeing these lines halfway down each tooth as wear marks almost as if the end plates had worn the sides of the upper half of each tooth down by 0.5mm or so.

index.php/fa/16384/0/

index.php/fa/16384/0/

I guess I've read that picture wrong if that side is actually normal looking and therefore it does look like a spacer issue which maybe could be fixed by turning the sprocket around to move it inwards very slightly although looking at the circular line on perimeter of the sprocket on the outer pic, I'm fairly certain that (on oem and renthal at least) is always to the outside.

What sort of spacers did you get with the wheels viper? Don't suppose there's any washers behind each of the bolts?

Attachment: DSC_2079.jpg
(Size: 76.77KB, Downloaded 97 times)

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Re: Uneven sprocket wear [message #218190 is a reply to message #218140]

Mon, 19 July 2010 09:33

david7m is currently offline

Messages: 3988
Registered: February 2004
Location: Jnc 10 M6

(11) MotoGP Podium Finisher

The chain looks bone dry too!

Dave

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Re: Uneven sprocket wear [message #218195 is a reply to message #218190]

Mon, 19 July 2010 11:13

viper_biker is currently offline

Messages: 702
Registered: November 2006
Location: Belfast

(6) 125 GP Racer

There is no wear on the inside of the sprocket. I'll take the wheel out and clean any lube off the sprocket and get the pics off to PVM.

david7m wrote on Mon, 19 July 2010 09:33

The chain looks bone dry too!

Dave

Profi dry lube.

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Re: Uneven sprocket wear [message #218235 is a reply to message #218195]

Mon, 19 July 2010 19:04

viper_biker is currently offline

Messages: 702
Registered: November 2006
Location: Belfast

(6) 125 GP Racer

Just had a thought, I'll measure the stock wheel and spacers and see if there's a difference in them.

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Re: Uneven sprocket wear [message #218265 is a reply to message #218031]

Mon, 19 July 2010 20:50

DrMartin is currently offline

Messages: 4746
Registered: January 2004
Location: Boredsville

(13) MotoGP Champion

I'll bet you five Irish Dollars there is Thumbs Up

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Re: Uneven sprocket wear [message #218344 is a reply to message #218031]

Tue, 20 July 2010 16:30

bushman is currently offline

Messages: 24
Registered: September 2008
Location: R.O.I.

(1) Club Racer

That rear chain wheel may be faulty.

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Re: Uneven sprocket wear [message #218350 is a reply to message #218344]

Tue, 20 July 2010 17:25

viper_biker is currently offline

Messages: 702
Registered: November 2006
Location: Belfast

(6) 125 GP Racer

bushman wrote on Tue, 20 July 2010 16:30

That rear chain wheel may be faulty.

In what way? My thinking would be that it would mark both sides of the sprocket.

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Re: Uneven sprocket wear [message #218351 is a reply to message #218350]

Tue, 20 July 2010 17:42

bushman is currently offline

Messages: 24
Registered: September 2008
Location: R.O.I.

(1) Club Racer

Perhaps a manufacturing fault?,might be worth changing it to see.what does the front chain wheel look like?any play there?

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