So i bought a tlr from a guy in the middle of nowhere for what seemed to be a good price...realize when i get her home that the speedo is not working. Pulled the speedo sensor to see what looks like chain rubmarks. Is the sensor supposed to be completely round and a little larger diameter wise than a sharpie marker or is it supposed to be squared off on the one side of the sensor nub. The guy said he put 2000 mi on her since november and pretty much all of it was idiot driving of practicing brake torqueing in the local gas station parking lot, burnouts at every stoplight and learning how to ride a twin cylinder 1000cc unicycle. any help would be great...btw, totally new to the forum and streetbikes in general...looking forward to getting into my new obsession...been a dirt rider for the last 20 or so years.