The 100-cubic-inch Freedom engine burbles as we pick our way through L.A. traffic toward the twists of the local hills. Accelerating hard in first gear can be a rush, but we quickly reach the rev limiter, which comes on like a soft suggestion rather than the abrupt shutdown found on most bikes. The Kingpin can haul serious ass; another whack of the throttle, in third, gives us an 80-mph smile in the space of a long exhale. The Freedom engine makes power way down in the rpm band and comes on strong as the revs rise, but it delivers the goods with class. This means no lunges or flat spots, just a hint of abruptness from drivetrain play. The OHC, 50-degree V-twin is a happy revver, but the counterbalanced engine is also smooth, and we never felt vibration to be a serious issue. Most big twins sound overly muted, but the Tour ekes out a clear rumble, especially under acceleration.