The number one reason bikes are stolen is the plastics on the bikes.... easily taken off and sold on ebay for big untraceable bucks
During the winter storage I took my side plastics off....first the bike looks like shit with out them... second it took me like (ten minutes) to unscrew them
another thing I did was unbolt the clutch lever... bike cant be started with out pulling in the clutch on most bikes (1 minute)
all this plus my Scorpio pager alarm
any other ideas on simple deterrents ??