Hi all. Trying to revive a 1986 Toro walk-behind mower with a Tecumseh engine. I installed a new carburetor, plug, gaskets. I reattached the throttle control wire and spring to the governor same as before I replaced the old carburetor, as best I can tell (the wire and spring became detached while I was removing the old carb. Now the engine starts up fine but then roars at full throttle and I can't reduce the throttle. Can someone point me to info. on throttle control for this engine? Thanks.