Jac Kelvie was holding court in the parking lot of Dulono’s Pizza amid a cloud of exhaust, cigarette smoke and machismo. Hundreds of bikers turned out for the regular “First Thursday” event in south Minneapolis to show off their Harley Sportsters and Ducati Monsters and talk shop. While others revved their engines, Kelvie used bungee cargo nets to secure a single change of clothes, a toothbrush and a walking cane to his moped. A red plastic gas can was strapped to the front fender. Passersby in leather vests paused to gaze at the 5-foot-4 man in polyester pants with a...