With Giles on this one ... your biggest problem is scroats knowing it's there
If they want it, they'll have it .... make no mistake, and it won't matter one jot what security measures you take
NO cleaning your bike in full view of passing traffic ... NO leaving it on display for all to admire ...
I live in a scroat bag area where my bikes (650 X-Country and F800GS) would be ripe pickings for the scroat bags to ride the pit tips
They sleep outside in the back garden, no garage, mid terrace house, under three covers each, and ground anchored ... the ONLY people (I hope) that know my bikes are here are my immediate neighbours. If anyone is walking up the backs when I come home I ride straight out the top and back round again. When no one is looking the bike is quickly in the garden and out of sight
If girlfriend Sue comes across on her TTR250 that is whisked straight in to the back garden (enclosed and out of sight) IF 'they' were to see her bike outside 'they' might come for it .... and find mine
Paranoid? You bet, I spent ten years in the CID Stolen Vehicle Squad
You can deter the opportunist scroat bag, but a professional, if he knows where it is, and he wants it ... he'll have it
As an aside, I even check, as I ride up the backs, that no one has followed and stopped at the bottom to see where I have gone (yes, I have known this, a mate had his bike stolen thus) so one night I saw a car stop behind me as I turned up the backs, I stopped, a voice said "Are you thinking of running"
It was a police car that had followed me ... bless