Mine gave up today , was on my way back home from a ride and started to hear a strange noise . Checked it over when i got home and there's a nasty noise when i turn the wheel and play in the sprocket carrier ..

Anyone know the bearing dimentions ?

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I've found the size but there seems to be options .
Whats the best one to get from this list ?
Think i'll get a spare too ..
http://simplybearings.co.uk/shop/adv...04-2rs&x=0&y=0

Will i need to renew the seal ? If so what size ?

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Just avoid C3 high clearance bearings - they have built in play/slop from new!

I tend to use SKF bearings, but that's just personal preference.

If the seal is at all damaged or has gone hard, then it'll need replacing, but even if it looks OK, it's probably prudent to replace it given the cost. Don't quote me, but as far as I can recall it's a 7mm wide seal...

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http://www.yamahamotorcyclespares.co...%20wheel?uID=0

Bearing seals are on this page. Not too cheap for a bit of rubber.


For SKF bearings, get them from bearing boys.
�26 delivered for the whole set.

Front and rear:
http://www.bearingboys.co.uk/6203-2R...Bearing-1889-p

Sprocket carrier:
http://www.bearingboys.co.uk/6304-2R...Bearing-1930-p


Then, do your own greasing:

http://www.xt660.com/showthread.php?t=19728

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Bike: 2013 XT660Z, TKC70 tyres

Mods:
Barkbusters, Scottoiler, DIY Tail Mod, DNA Stage 3, Power Commander V & O2 Eliminator, Exan X-Black Stainless exhaust, Tool tube, Ohlins linear front fork springs, Nitron rear shock, JT front and Supersprox rear sprockets, D.I.D. VX 520 chain, Adventure Spec bashplate, DIY USB Outlet, DIY chain guide, Kev's Throttle mod

http://www.facebook.com/onemooseonemotorbike

No need to pay Yamaha prices for the seals, you can order them along with your bearings for a couple of quid from simplybearings.

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These are the wheel bearing dimensions:

Hub bearings : 6203-2RS
Sprocket carrier: 6304-2RS

Seals:
23 x 40 x 7 disc side rear.
30 x 52 x 7 on the sprocket carrier.

I've just replaced mine (preventative maintenance!) with SKF sourced from a local bearing factor - total cost for the full rear (three bearings and two seals) was �25.

The fronts are also 6203-2RS and two 23x40x7 seals.

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Simon

Brighton, UK

Hey guys, am just about to have my sprocket carrier lathed out to hold the 4304-2RS double row bearing. Some have suggested lathing 5mm. Problem is the difference between the standard 6304-2RS and the new bearing is 6mm. Guess 6mm machining it is then for me. Anyone experience similar differences?

Also my sprocket carrier where the bearing sits in is quite warn. The bearing slips in and out easily. Am going to use retaining compound medium strength to hold it firmly in place. Have some poly urethane rubbers to go in so looking forward to feeling the difference.

I want to do some preventative maintenance as well and I'm thinking of replacing all the bearings on the bike. This way I will know what mileage they have on them in the future.

What I have so far is the two bearings on the front wheel, the two in the handlebars/forks, the two in the rear wheel and then two in the swing arm.

Am I missing any?

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Yeah... Nine bearings (and two bushes)

There are two more in/under the swingarm where the dog bones mount to it and don't forget the six in the suspension linkage relay. Also you may need the two bushes to go with the two swingarm pivot bearing. You haven't mentioned the sprocket carrier bearing either. Do you REALLY need to replace them all?

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