The Pulser Coil, (often called Pickup Coil, Timing Coil or Crankshaft Position Indicater ) is responsible for providing the timing signal to the ignition control box on modern motorcycles with solid-state ignition system. The Pulser Coil, as a unit, is not usually serviceable. It is a sealed component, and should be replaced if determined to be a problem. Pulser Coil problems sometimes manifest themselves in hot running situations, but usually failures result in no spark at all. When the pulser coil fails it will usually produce no output pulse, or a very weak one.
I've had several go bad in Triumphs. They quit working when they get overheated at continuous high speeds on a hot day. After the bike quits, which will definitely be at some spot where you didn't need that, like an HOV lane during rush hour, after it cools down a few minutes it will work again until it gets hot again. Slowing down helps it last a bit longer.
Bare