No problem - remove the air filter so you can see what's going on.
You will see a long light-gauge spring. This is the speed govenor spring. At one end, it's connected to the throttle link. At the other (front) end, the spring is attached to a fixed point, which you will have bent by mowing under that bush.
All you have to do is bend it back to increase tention on the spring. Do this with the engine running - and bend until you get the correct engine speed back. Don't overdo it!
phil_saunders@bigfoot.com
Phil Saunders
September 2008