I'm replacing the sprockets and chain on my 05 S4R and for the life of me i can't rear sprocket nut off. Any tips???? The nut isn't reverse threaded by any chance?
No, not reverse threaded.
Usually they're quite tight, requiring a serious impact driver to remove.
Try some penetrating oil, that helps.
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Mine only has 800 ft./lbs. but does the job a trick.
ONLY? Mine is 225 and it does 90% of what i need it to do.