Engine Startup/Shutdown
YASim jet engines have no real startup/shutdown methods. As long as they have fuel, they are running. The controlling parameter is the engine "out-of-fuel" boolean value:
/engines/engine[n]/out-of-fuel
The engine will always run as long as this value is false. Toggle the fuel supply off, and the engine stops running. Toggle the fuel supply on, and the engine is suddenly running again. YASim has no provisions for anything fancier than that.
see http://www.buckarooshangar.com/flightge ... t_jet.html