What causes a magneto to go bad?

A magneto can go bad due to several factors, including wear and tear of its components, exposure to moisture or contaminants that can corrode the internal parts, and mechanical damage from vibrations or impacts. Electrical issues, such as short circuits or insulation breakdown, can also lead to failure. Additionally, improper maintenance or prolonged inactivity can result in degradation of the magneto's performance. Regular inspections and maintenance can help prevent such issues.