How many miles did you get from that sprocket? My last bike, WR250X, ended up with BADLY hooked teeth after 12k miles. I read somewhere that singles were heavy on sprockets, & wonder how long the XT will last, particularly when ridden 'spiritidly'.....
Also, there was someone on another forum who made alu sprocket covers with big holes in it, so you can see sprocket condition at a glance - is there such a thing for the XT????