Development
The Topper H was introduced in 1961 (sold through 1965) with a new alloy cylinder head that increased the compression ratio to 8.0:1, the transmission placed in a sealed oil bath, a reusable foam air filter, and revisions to the cylinder ports and air intake tube.
A detuned version of the Topper was also available, with the power restricted to 5 hp (3.7 kW). This was advertised as the "Topper U".
Read more about this topic: Harley-Davidson Topper
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