The adrenaline rush will produce a faster and stronger than normal heartbeat. That's when you get the feeling of a butterfly or flutter in the chest.. Other causes for chest flutters may include: 1  Caffeine. 2  Alcohol. 3  Smoking. 4  Exercise. 5  Fever. 6  Over-the-counter medications such as diet pills or allergy medicine.
A CDI, or Capacitor Discharged Ignition is a system that is linked to the ignition of some petrol engine driven vehicles.Its purpose is to store an electrical charge that is discharged through the ignition coil and thus increases the power to the spark plug/s for a very powerful, high-energy spark.This prevents fouling of the spark plug/s.A CDI can be disconnected in some vehicles and the engine would still run, but with a less powerful spark to the spark plug/s.his prevents fouling of the spark plug/s. A CDI can be disconnected in some vehicles and the engine would still run, but with a less powerful spark to the spark plug/s.
When working with CDI type ignition systems, it is very important to be aware of the high voltage discharge from the spark plug. Testing for a spark on many classic bikes consists of laying the plug on top of the cylinder head (connected to the plug cap and HT lead), and turning the engine over with the ignition on.lectrical power from the battery (for example) charges a high voltage capacitor. When the power supply is interrupted, the capacitor discharges and sends the current to the ignition coil which then increases the voltage to one sufficient to jump the spark plug gap.