Should do - basic principle is a mercury tilt switch that has a blob a mercury in a tube covering two contacts. As the tube rotates, the mercury moves off the contacts and breaks the circuit. Return to the original position and the circuit is made again.
You could wire it in to act like the handle-bar mounted cut-out switch? Should be quite cheap from your local Maplins...
http://www.maplin.co.uk/Module.aspx?...itch& doy=7m2