Harley-Davidson 1940 Model UL

The 1940 Model UL with its flathead Big Twin engine and a dry sump lubrication system was one of the most reliable models of its time.

1940 Model UL
By 1940 the venerable flathead Big Twin engine had been thoroughly sorted out by Harley-Davidson engineers, making it one of the most reliable models of its time.
Photo courtesy Motorbooks