Remove the rear cover on the scooter’s left side and locate the nuts attaching the muffler to the frame and the exhaust pipes. Remove those nuts with a wrench from the socket set. Once all of the nuts have been removed, simply pull the muffler out.
Use a pair of pliers to remove the rear axle cotter pin by straightening it. With the pedal or the level, engage the scooter’s break. To prevent the tire from rotating, break the axle nut’s torque with a socket, which is further attached to a breaker bar. Get rid of the axle nut and pull off the rear tire. Remove the front tyre in a similar manner.
Now, it is time to replace the inner tubes. Deflate the tire by removing the valve stem core. There will be a seal or bead present between the tire and wheel. Break that seal with a bead breaker tool.
Apply pressure along the sidewalls of the tire in order to loosen it. Insert the tire irons in the 11 and 12 o'clock positions between the tire and the rim.
With the curved end of the tire irons inserted between the tire and the rim, apply pressure on the other end of the tire irons. Move the 12 o'clock tire iron and bring it to the 1 o'clock position, while holding the other tire iron firmly in place. When you push down on the 1 o'clock tire iron, the tire will slide off the rim. Continue working in this manner until one side of the tire has been freed from the wheel.
Remove the old inner tube and insert the curved end of a tire iron between the rim and the tire's inner lip. Pop the tire off the rim completely by pulling the tire iron towards you.
Slip in place the new inner tube, inflate it just a little bit and insert it into the tyre. Pull the tyre back in its original place using a tyre iron to make things simpler for you. Make sure that you restore the tyre over the rim in its original position.
Start inflating the new tube and continue until two loud pops are heard. The loud pops are an indication of the beads setting in place. Bring the tire pressure to the desired level by inflating or deflating the new inner tube.