Signs of life are finally coming back to the motorcycle industry, as Harley-Davidson has shown strong gains in the third fiscal quarter of 2013. Posting an increase in sales of 15.5% worldwide, Harley-Davidson grew 20.1% in the United States the last three months, due mainly to its “Project Rushmore” line of water-cooled motorcycles.

“Rider response to the 2014 motorcycles we introduced August 18 was extremely positive. In fact, initial retail sales of the new Project Rushmore motorcycles sparked the largest year-over-year new model year sales increase in two decades,” explained Harley-Davdison CEO Keith Wandell in the company’s investor communique.