Can anyone advise me of a purpose built or otherwise tripod, tie down system for mount a DV on a motorcycle fuel tank.

The system needs to hold an FX1, so a few kg, not a handycam.

And no I am looking at producing Ghost Rider 3.

Regards, Tony

There is a whole site dedicated to motorcycle mounting solutions.
http://www.pashnit.com/more/cameramount.htm

Ah but Ghost Rider 3 would be a good thing. :D