hi i waz cleaning the bike today and i tried to move the back sprocket to see on the cushion drive needed replacing it waz ok but i could move the sprocket side ways ,i need to replace the wheel bearings?is this a easy job?can any one advise me .

How do you mean "sideways"?

i can pull the sprocket and that what it is bolted to towards me.or towards you if your kneeling in front of the back wheel were the sprocket is located ..i can wigle it back and forth..does that help

Richard you can only tell if your rear wheel bearing are worn if, once the wheel and the spindle are fitted in place and tightly bolted to the correct torque, you are still able to get a play from side to side on your tightened wheel. If you get lateral movement the bearings are worn.

If you face the wheel and you can pull and push the sprocket and carrier towards and away from you then there is a problem, it is unlikely to be the wheel bearings though, that would show up as movement in the wheel, ie , grab the tyre and the wheel would rock about the spindle. What you are describing does not sound like that, how much does it move?

There is a single ball bearing race in the sprocket hub, this bearing can have a small amount of side ways play this is normal as it is not a roller bearing type, but should not have any play in the direction of the chain is pulled.

If the side ways movement is excessive you would need to replace the hub bearing. Also check the rear wheel bearings as well for movement before removing the rear wheel. There are 3 bearings in the back wheel, 1 sprocket & 2 wheel bearings.

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946