How to replace 501sx sprocket plz

[w7x]

hi

how can i change the sprocket on the 501sx saw? i tried to turn the nut clockwise to turn it loose, but it just moved a little and now wont even go to any side at all anymore...
so the nut is like stuck, sprocket is just wobbling on the shaft and i dont know which way to turn it anymore :s

 

[727sunset]

The nut needs to turn CW for removal.
You'll likely have to immobilize the piston with a piece of starter rope to be successful.
Lots of threads on here explaining the procedure.
Let us know how it goes

 

[w7x]

ok thanks. i managed to do it with a bit better rope and harder turns now (but it was a bit weird that it took exactly 2 hard turns(clockwise) and was like a bit more loose in the middle...)

 

[727sunset]

Can you show us the thread on crank end?

 

[w7x]

its like this:
https://www.upload.ee/image/11267485/sp1.jpg
too bad that i did not take a before pic... or maybe i have something on some older random pics...