So, had a new chain and sprockets installed today. What a difference! This 'new to me' 2005 Sprint ST would surge at low speeds, and buck when downshifting or just holding a constant speed. Now, it is silky smooth. What a difference that made! I still cannot get over the change in drivability. Went from "I don't think I want to keep this bike" to "I don't want to get off this bike!".