Coasting downhill to a stop yesterday I heard what sounded like I'd run over an flattened can (a brief sort of metallic clatter) and suddenly the bike's RPM dropped to the point I thought it would stall out. A quick adjustment to the idle knob at the stop-sign brought it up above stalling but it doesn't sound like all cylinders are firing. 11 yards of mulch awaited me at home so Connie-Lingus stayed parked yesterday.