If you were expecting that this category was about clothing for people with shorter arms, you'd better leave the electrical repairs on your motorcycle to a professional, one who is a bit more familiar with electrical bits and bobs.
Although, almost anyone can repair electrical cables with a shrink sleeve, also known as heat shrink tubing. Or rather: you can finish the repair in a neat and secure manner. Generally, the correct order is to slide a fitting piece of shrink sleeve on one of the wires, then repair the electrical wire. Slide the heat shrink over the repaired area, heat it up a bit and watch the sleeve shrink, making a very tight fit over the wires. It will look like new again and dirt and water will have a hard time reaching the repaired area.
Heat shrink protects and isolates, providing a waterproof seal, with a highly reduced risk of short-circuiting. Another option is to use insulation tape, although a heat shrink tubing looks a lot better.