(Portland, OR)  --  Portland police are investigating a crash involving a motorcycle that left the rider dead.  The crash happened around 2:00 a.m. yesterday at the intersection of Southeast 29th Avenue and Powell Boulevard.  Police say the motorcyclist was thrown from his bike after he crossed into opposite-lane traffic at high speed and slammed into a station wagon.  The motorcyclist died at the scene.  No one else was injured.