It also marked a return to the single-camshaft configuration as used on previous Harley Big Twin Engines from 1936 to 1999.

The most significant change from the Twin Cam are the two extra valves per cylinder head which produce 10 percent more torque.

[4] Harley conducted interviews in seven cities; over 1,000 people were asked to outline what they would like to see in the next line of touring bikes.

To deal with the heat issue, Harley reduced the exhaust gas temperature by 100°F (55.6 C) by introducing a better water cooling solution, and also relocated the hot catalytic converters further from the cockpit, allowing for a more comfortable ride.

[5] Cycle World, like many other motorcycle magazines, was given the opportunity to test ride and review the Milwaukee-Eight engine.