Harley-Davidson Inc. said Thursday that it will discontinue its Buell line of performance motorcycles and sell an Italian motorcycle unit in order to focus on its main namesake brand. The announcement comes as the Milwaukee-based heavyweight motorcycle manufacturer said that profits dropped 84.1 percent amid a continued decline in worldwide retail motorcycle sales. The ending of the East Troy-based Buell line of motorcycles, will result in the elimination over time of 180 jobs , with about