Motogadget mo.Lock Backup Capacitor

For the bike with extreme voltage drop during engine start, this is exactly what you need. Works in conjunction with the mo.Lock to ensure the main relay stays powered after engine start.

Motogadget's Take:

"The mo.Lock (m-Lock) backup capacitor is used to level short-term voltage drops to the main relay. 
If cranking the engine via the electrical starter is slow and resistive, very large single cylinder capacities or high compressions can cause significant voltage drops. Implementing a backup capacitor prevents short-term voltage drops from de-energizing the main relay. 
Excessive voltage drops can only be prevented by an optimal, sufficiently powerful battery and the lowest possible resistance in the vehicles electrical cables."