In 1911, the company introduced an improved V-Twin model with a displacement of 49.48 cubic inches (811 cc) and mechanically operated intake valves, as opposed to the "automatic" intake valves used on earlier V-Twins that opened by engine vacuum. It was smaller than earlier twins but gave better performance. After 1913, the majority of bikes produced by Harley-Davidson were V-Twin models.
In 1911 the company introduced an improved V-Twin model with a displacement of 4948 cubic inches (811 cc) and mechanically operated intake valves as opposed to the "automatic" intake valves used on earlier V-Twins that opened by engine vacuum It was smaller than earlier twins but gave better performance After 1913 the majority of bikes produced by Harley-Davidson were V-Twin models