Power off the Craftsman mower.
Locate the iron flywheel on the top of the Craftsman mower's Briggs & Stratton engine. The flywheel has a distinctive, wheel shape. This flywheel is covered with a "shroud" that is held in place by a several bolts. Take out each bolt using a socket wrench.
Remove the flywheel's shroud.
Find the Craftsman mower governor's plastic flap. It sits beside the engine's magneto, which is on the side of the exposed flywheel. Remove the bolt from the flap here with a socket wrench.
Find the Craftsman mower's carburetor on the left side of its engine. It bears a distinct, bowl shape that is easily recognizable compared to the rest of the engine. The governor's rod extends into an eyelet on the carburetor. Pull the rod out of this eyelet. This will adjust the governor and allow your Craftsman mower to run at a higher, ungoverned speed.
Reattach the flywheel shroud to the flywheel using the removed bolts and your socket wrench.