Instead of bending the plate that the spring is attached to, you can shorten the length of the spring slightly by removing it and putting a sharp bend in to where you want the spring to stop. This way if it goes wrong you only need a new sring (about £0.20)
1. start the engine
2. GENTLY pull on the spring until the desired engine speed is reached.
3. Mark the point on the spring that where you would want it to stop against the plate (to maintain your new speed).
4. Carefully unhook the spring and make a new hook with a set of needle nose pliers at the mark you made earlier (make the new bend / hook toward the old one, not toward the coiled spring section).
5. Reattach thee spring
6. Start your engine and (hopefully) smile at it's new found speed!
P.S don't adjust the engine speed up too high or you may cause it to die a smokey death!!
Longshanks
October 2008