Total loss will earn you a few KG's, as will junking the starter motor.

Of course, you'll need to charge the battery every night, and push start the bike every time, but if you wanna save weight...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball