hi the small dia black cable/wire on your engine is in fact the low tension circuit, if this wire is in contact with any part of the engine you will not get a spark at the sparkplug.You can fit a small switch in the circuit this will allow you to stop the engine.Connect the black wire to one side of switch, make a short wire and connect this to the other side of the switch, the other end of this wire connect to a screw or bolt on the engine.you can then switch on and off the ignition.
hope this helps
bill
March 2009