1918

Single-cylinder motorcycle engines were discontinued

Parts Listings for Harley Davidson Motorcycles 1909 – 1932 Official Publication

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1917

Parts Listings for Harley Davidson Motorcycles 1909 – 1932 Official Publication

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1916

The first issue of “The Enthusiast” publication

Parts Listings for Harley Davidson Motorcycles 1909 – 1932 Official Publication

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1915

Three speed transmission

Parts Listings for Harley Davidson Motorcycles 1909 – 1932 Official Publication

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1914

Step-starter and internal expanding rear brake

Parts Listings for Harley Davidson Motorcycles 1909 – 1932 Official Publication

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