1910 brought the legendary "Bar and Shield" logo that was placed on their motorcycle. This would become the defining symbol of Harley-Davidson to this day. Numerous first place winnings in races, v twin engine endurance contests and hill climbs give Harley-Davidson more recognition.
The "F-head" engine is introduced in 1911. It will be the power workhorse until 1929, when the "Flathead" engine is introduced.


Arthur & Walter Davidson, William S.
Harley and William A Davidson (1915)

The year 1912 saw further growth of the Harley-Davidson Companyv twin engine . Construction began on a new 6-story factory. Harley-Davidson also became an exporter this year andv twin engine  their first overseas sale was made in Japan. In the states there were now over 200 dealerships. v twin engine


1914 saw the addition on the sidecar to the Harley-Davidson. The Company also formally put their hand in the ring of motorcycle racing this year and would soon dominate the sport and become known as the "Wrecking Crew". 





 

The F-Twin "Silent Gray Fellow" from 1915
was called that way due tov twin engine  its color and its silent motor

1915 saw the emergence of the three-speed sliding-gear transmission. In 1917, one-third of all Harley-Davidsons were sent overseas to the U.S. Military to fulfill their patriotic call and to aid in the war effort. The following year, roughly half of the motorcycles produced were sold to the U.S. military. In the end, about 20,000 motorcycles were used in the war, most of them Harley-Davidsons. By this time Harley-Davidson was the biggest motorcycle factory in the world with nearly 2,000 dealerships worldwide. In 1918 Harley-Davidson v twin engine was the biggest motorcycle factory in the world. They even survived the depression. The V-twin was Harley's specialty, so the company tried to defeat its only remaining rival ... Indian.
But these days were the thoughest, because the motorcycles v twin engine got out of date and the prices of automobiles decreased (the T-Ford was born).






Indian


Therefore, Harley Davidson tried otherv twin engine  technical enterprises, like manufacturing parts, side cars and even airplane motor-engines, but they also improved their own products.

The 1920's saw some changes to the appearance of the motorcycle, which are more recognizable today. One such change was the identifiable teardrop shape gas tank. In 1926, single-cylinder engines were once again available, having been discontinued in 1918. In 1928, the v twin engine first twin-cam engine and front wheel brakes were available onv twin engine  the Harley-Davidson. With this modification, the motorcycle could reachv twin engine  speeds in excess of 85 mph.



 

V-Twin from 1923