Its TECUMSEH. Why does almost everyone have difficulty with properly spelling this engine name?!?
Anyways...
You didn't post a model number so we'll have to fish here...
Does your carb have high & low speed fuel mixture adjustment screws? If so, set them so the high speed (on the carb bowl's bottom) is turned counterclockwise 1.5 turns from a LIGHTLY seated position, low speed (on the carb's side, in the middle of the body) is turned counterclockwise 1 turn from a LIGHTLY seated position.
If the governor settings were messed with, you will have to run the engine at LOW speed & achieve your best low speed RPM by adjusting the idle stop screw at the TOP of the carb. Only then should you increase the throttle & shoot for the high speed governor setting. Adjust the small screw right next to the throttle lever until a safe, high RPM is achieved.
Hope that helps...
Marty FORMERLY MAJORXLR8N