There was a suggestion  on sci.electronics.basic some time  ago for a =
high
voltage (non-lethal) generator that fired when the bike reached a certain=
 speed.


 It required a dynamo/lighting generator - not so common nowadays - but a=
 PIC
and a dc supply could no doubt be used instead...

This still wouldn't stop the thief who simply hoists the bike onto a =
truck, of
course, and if I fitted one to my bike I'd need an Early Warning bleep =
for the
times I forgot to disable it .

You litigation-conscious  fellows would no doubt panic at such an idea, =
of
course.  We mustn't do anything to hurt the poor thieving sod who was no =
doubt
abused as a child and never taught  right from wrong....

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