Harley Davidson

Harley Davidson introduced their first F head, or inlet over exhaust engine in 1903 and would remain faithful to the concept until 1929 when the last F head twins left the factory to be replaced for the following season by side valve models. Although in the company did employ other valve configurations in the period between 1903 and 1929, Harley's success in the first three decades of their existence was largely due to their faith in a valve configuration that had largely been abandoned by European manufacturers during the pioneer period.

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