Those 50's singles had some good 380 lbs of weight to calm down the vibrations of a single. The Borile, what with its meager 230 lbs has less mass to absorb the unbalanced 500 cc engine's vibes. Different balance factors are going to be tried and, in the future, a counterbalancer will be added. After my short spin I turn back to the factory. It's noon already and in Italy, this means its time to close the shop and head for the nearest Trattoria for wine, food and a moment to talk about life.
Work can wait a bit.
We order some good local red wine and Umberto proceeds to tell his life's story. In the 80's he used to race motocross in local events gaining some nice placings in the area's championship, but at one point he understood that he is more talented as a bike builder than a bike rider. A little shop he opened allowed him to begin his experiments. But eventually his own interest turned to the more unique niche of road going singles. His first try was with said GM engine, still with its speedway crankcases.