What will cause a cdi box to burn?

A CDI (Capacitor Discharge Ignition) box can burn out due to several factors, including excessive voltage input, short circuits, or overheating from prolonged use without adequate cooling. Poor connections or damaged wiring can also lead to arcing, which may cause the CDI to fail. Additionally, using incompatible or faulty components in the ignition system can put undue stress on the CDI, leading to its failure. Regular maintenance and ensuring proper installation can help prevent these issues.