Same with the Ninja 300. Many people had no stalling issues. A year or so after the Ninja 300 was out, Kawa identified the problem and issued a recall for many, but not all motorcycles. Often it is one batch of ECUs or one set of programs, etc. When a recall happens they always say it involves "certain" models. They could easily have one assembly line using parts from different suppliers. Other times, they are not sure, but can include many more bikes than actually need a fix in the recall until they do some testing on the bike. Piaggio about 3 years ago had to recall thousands of scooters across several years for faulty fuel pumps. Exactly how many scooters which were underway coughed, died, and would not restart until the bike cooled off, I don't know. I did have one of them though.