Police say speed was a possible factor in a motorcycle crash on the Kamehameha Highway on-ramp to the H-3 freeway at about 7:30 this morning.  The 23-year-old man lost control of his bike on the curve as he was entering the freeway on the Kaneohe side and crashed into a guardrail. He was pronounced dead at the scene. He was wearing a helmet.  Police believe the man is a member of the military, lives in Kailua and was on his way to work at Pearl Harbor when he crashed.