Limits your moped to exceed desired max speed by cutting spark.  

Not all components are in real life like in schema drawing, see the text fields around components.

 

Actually used A-Star 32U4 Micro ( No fritz model :-/ )

 

Some moped and scooters might not like that ignition coil signal is routed directly to ground, prevent spark. But this is typically how moped engine shutdown buttons work.