Bourneriver

Thanks for the replies. I have been trying penetrating oil but it is getting it into where the actual male and female threads are in contact. Also breaker bar is an old school Norbar torque wrench which doesn't flex, well not at these sort of torques. Access is tricky for anything too brutal, not wanting to damage the bike when it does let go and tools move about a bit. Also I seem to be at the maximum the rear brake can apply when preventing the wheel from turning via the chain which is of course straining those components too. I'm going to call in at the MOT garage over the weekend and see what they can do. Thanks again for all your suggestions. Richard

I'm in Bournemouth BH4 postcode

Hello Thanks for your reply. Picture attached. No protruding thread but looking at You Tube videos for other bikes (inc. XT660) they are all right-hand threads, so suspect mine is too, I think now that its just very tight. Asking around a friend has said he had similar when a bike shop fitted his sprocket with a pneumatic impact gun - suggests over-torqueing which is a worry. I didn't own the bike when my sprocket was fitted so can't be sure. May have to talk to my friendly MOT garage and see if they can get it off. It's that or drill the nut and split it 😬

Hi Everyone I'm Richard a new member from the UK Trying to remove the drive sprocket on my 2011 MT-03 660. Bent back the tabs on the tab washer but I can't seem to budge the nut. Don't have a pneumatic impact gun so using a 2 ft long bar, person on bike, both brakes on. Still no-go so I'm wondering if its a left hand thread or there's a trick I'm missing? Don't want to use heat as I have an O-Ring chain, plus not sure if there is a nearby output shaft seal or similar. Any suggestions gratefully received. Richard