What I meant to say is this: my engine is the TNT100. On this series of engines, to increase the speed you will have to bend the tab (for which one end of the governor spring hooks to) leftward; to decrease speed, this same tab is bent forward.
It is actually not recommended to bend the tab back or forward whilst the engine is running because you may risk burns from the hot engine. Also, it is not recommended to tie down the control bar for safety reasons.
Also: I wanted to know whether or not the #670326 governor adjustment tool Tecumseh supplies actually works with the TNT100 and TNT120 series engines.