Most Tecumseh engines have a fairly simple bowl carb, remove the the securing screw in the base of the bowl, the jet is now screwed up the centre of the carb, you will need a good stubby flat blade screw driver to remove it if you do not completly remove the carb, do no damage the jet with a poor screw driver, it is brass and the edges will break away.
Husqvarna man, April 2010