I read that as the trigger-control that operates the throttle. The arboristsite people have characterised your chainsaw as a particularly nasty one to work on, so it isn't surprising that you are having trouble with the throttle mechanism.
The essential things to have when starting an engine, are a preplanned way to stop it, and a basis for being confident that it won't hurt you or itself. In this case, the key question is whether the throttle return spring is on the carburetor, or on the trigger mechanism you are proposing to run the engine without. When the remote throttle control is disconnected, the way you want to run it, does the throttle on the carburetor still spring closed? If not, do not start the engine in that condition: it is likely to over-rev and it may self-destruct. It would also be dangerous and unpleasant handling an over-revving engine to get at its kill switch. If there is an adequate throttle return spring on the carburetor, and it still works when the remote control is disconnected, it is safe to run the engine that way but it may be pointless: chainsaw engines usually will only start with the throttle propped part-way open, and the little latch that holds them in that start position is part of the remote control. Your engine will not start with the throttle in the closed position.
