Then no thank you, I don't need another doorstop ;)
Can I interest you in a Jawa? :munky2:

Rick, the torque spec for that nut is no more than the wheel nut torque on the average car, so you shouldn't be having so many problems getting it undone.
Can anyone confirm - it's not a left hand thread by any chance is it? Can't thing why it would be though.

Pete

Pete, what a nightmare it was!!

I took Darren's advice and bought a 4lb club hammer to use with my impact driver. Nut still wouldn't budge. :tazdevil:

Threatened the nut a couple of times with a cold chisel (getting desperate here!). Thought better of that as I hadn't ordered a spare nut as I had planned.
Was it actually a left handed thread?? Direction of sprocket rotation doesn't require a left handed thread but I checked the manual to be sure. No mention of being left handed.

So I let rip with a blow torch on it a couple of times; stood on breaker bar again and bingo - that satisfying crack of :brave:!!!

New sprocket installed with plenty of copper grease. I managed to torque up the nut with just the cylinder compression holding the countershaft enough.

Tip: when changing the front sprocket, turn it back and forth with the engine in gear to feel/hear any play in the clutch. I think mine needs attention and I've a nasty feeling there is play in the clutch basket cush springs :icon_sad:.

Rick

Took me a great deal of sweat, blood from scuffed knuckles and :cry[1]: (big boys do cry) to get my R's front sprocket off. Ended up putting the bike on a centre jack, got my dad to sit on the bike with near all his pressure on the rear brake, had a socket and a extension bar and another metal tube on over that (total about 1 metre long) and just about got the bloddy thing off.

Did the same as you a good go of grease on it and just keep an eye on it.

Took it off again to change the front sprocket over for off roading and so so much easier.

I just went down the local bike shop and asked them to undo it with their rattle gun (compressed air impact wrench as the tyre shops have) - Piece of cake.

No blood sweat and tears and no stained gearboxes, chains or blow torches and club hammers - aaarrrghh.

Not sure I'd let you guys near my bike with those kinds of techniques or tools!!!!! Smacking the end of the counter shaft with a club hammer via an impact driver - ouch no way (I know it works, but think of the poor gearbox bearings etc. being subjected to all that shock loading it wasn't designed to resist???)

Be gentle with your fine ride - it will look after you if you do.

Do you understand how a 'rattle gun' works..........

I expect he does, and to some degree he has a point. A rattle gun will only ever put a torsional load into the output shaft. An impact driver that you hit with a hammer will inevitably put a reasonable axial load into it as well.

Whether this is worth worrying about is another question.

I guess wheelies/jumping speed humps/off-roading is out of the question then?!
:p

At 51kg I'd say the XT660 engine is built like a brick s**t house.

Over 58,000 miles as a courier bike, 60-65mpg consistantly, 18-20,000 miles chain life, 10-13,000 miles on rear tyre (including E-07!!) and still easy on oil.
Haven't broken it yet.

Must be doing something right.....:angel1: