KAWASAKI AR50 / AR80 / AR93 Heavy Duty Stator coils
These are heavy duty ignition coils to replace your originals which are either broken or insufficiently strong to run the race CDI effectively.
Sometimes you will find that the bike runs fine until warm or will either start to misfire or cut out at high rpm or fail to tick over with erratic spark - these are usually signs of a stator coil breaking down. As they are affected by heat their operation changes although they may test fine on continuity when the bike is not running.