Adjusting the governor helps maintain a steady engine speed no matter the terrain and other conditions that could effect the engine workload. While the manufacturer highly recommends against this, it may be necessary to keep your engine running well.
Using needle-nose pliers, carefully unhook the spring from the end opposite the air filter.
Use the needle-nose pliers to either lengthen or shorten the hook at the end of the spring.
Carefully re-hook the spring on the arm it was disconnected from.