Wheel your bike onto a level surface and engage the bike stand. Put the transmission into gear to prevent movement.
Examine the screws on the switch brake and clutch handle on the handlebars. Newer models will require the use of a Torx wrench while older models will require an Allen wrench.
Use the wrench to unscrew the screws on the left-hand clutch housing. Remove both sides of the housing. Keep the clutch housing and the screws in a safe place.
Remove the right-hand brake housing using the same wrench. Once you have removed the screws and the housing, you will notice two small wires attached to the grip. Use the needle nose pliers to remove the wires, taking note of their orientation.
Pull on the grips to remove them. Twisting them from side to side will expedite this process.
Use the string to wrap around the handlebars to determine the grip size. The standard models are 1 inch in size, but custom handle bars can be up to 2 inches in size.
Twist on the new grips. Use the pliers to place the right-hand brake wires in the same position as you had them before. Replace the housings and screws of the brake and clutch.