Drive train sprocket carrier worn?

Cigaro · World Chat Champion Joined: 28 Mar 2007 Karma :

Hi all,

took the GN for its MOT today

One of the things my bike failed the MOT on was this:

"DRIVE CHAIN SPROCKET CARRIER WORN TO EXCESS (6.2.1e)

The guy at the bike shop says it needs to be repacked and adjusted. Is there a seperate bearing in the sprocket carrier then? What do I do?

Also both rear shocks are inneffective, is there anything that can be done to repair them? New ones ar eonly £50 but I'm a bit broke right now...

cheers.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

Sprocket carriers don't wear out what's he saying is wrong with it exactly?
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

serlant · Brolly Dolly Joined: 06 Jul 2009 Karma :

cush drive possibly? if its that and you can't get a new one you might be able to pack it with slices of inner tube to sort it till you can get a new one.

The Artist · Super Spammer Joined: 06 Jan 2008 Karma :

The sprocket carrier has a separate bearing inside it. Very little movement but I have had one fail on a cbr125.

Best bet is taking the chain and rear wheel off. The sprocket and carrier will fall out. Just check the cush drive rubbers. If they are fine, check the bearing inside the carrier.

Cigaro · World Chat Champion Joined: 28 Mar 2007 Karma :

Cheers, he mentioned cush drive rubbers but when he mentioned repacking i switched off and assumed he was on about a bearing.

So repacking the rubbers should be alright?

I'll check for play anyway, do I just see if the sprocket moves slightly with the wheel in place and spindle on?

TheDonUK · World Chat Champion Joined: 20 Feb 2006 Karma :

If it is the cush driver rubbers get them replaced, i was told mine were shagged months ago and i just ignored it, i strongly suspect it was their deterioration that caused the catastophic failure of the rear hub coming out, and the sprocket carrier smacking into the swingarm, locking the wheel at 40 Sad

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[Current Bikes - GSXR-750 K5 & C90-97 ] [Previous Bikes: Runner 125, YBR 125, GS500, Bandit 600, Hornet 600, ZX6R-99, C90-99, R1-99, XT600E-04, GSXR-750 K4, CRF250L '16]

The Artist · Super Spammer Joined: 06 Jan 2008 Karma :

The rear sprocket should have a little play in it to allow for shocks in the gearbox to prevent loosing traction and damage to chain etc.

MOT tester probably just shook the sprocket and thought it moved too much.

Just take the wheel off. Not a big job and have a look at the rubber. New rubbers are only a few quid off wemoto or ebay.

Cigaro · World Chat Champion Joined: 28 Mar 2007 Karma :

Well, the rubbers look a bit buggered, but the bearing has LOADS of play in.

Looks like I'm going to have to replace it.

Thanks for the help all.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

Get the bearing from a bearing shop, should be loads cheaper. Take the whole carrier down there and get them to match it. If you are too tight/skint to buy cush rubbers just pack them out with strips of inner-tube rubber.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

Cigaro · World Chat Champion Joined: 28 Mar 2007 Karma :

Managed to sort out some new rear shocks, a cush drive rubber and a new bearing for £70 all in, which I didn't think was too bad.

My friends and family all think I'm mental for keep throwing money at this old jalopy Laughing

Cigaro · World Chat Champion Joined: 28 Mar 2007 Karma :

Question: to change it do I just remove the dust seal and circlip, take the inner out and tap it out like a wheel bearing on a car?

Cheers Very Happy

The Artist · Super Spammer Joined: 06 Jan 2008 Karma :

I would have thought it was a sealed bearing so just get a punch and tap the outer race either side and it should come out.