I just got a '92 25hp Evinrude with a kill switch in the tiller handle. The throttle has to be held in position or it immediately returns to idle speed if the throttle grip is released. Is this the way this throttle is supposed to work? I have been studying the exploded diagram from the factory parts catalog of the steering/shift handle and there is no tensioner whatsoever. Motors which have a stop switch in the lower motor cover have a tiller with an obvious clamp type "throttle friction kit", not so with mine. I see nothing under the cowling that strikes be as being some sort of tensioner either. Am I missing something here?