backstory: Bought a 2015 about 3 months ago. Noticed that it had the mid RPM vibration between 3200-4200RPM, low RPM surge/hammer/choppiness below 3200RPM, and really bad choppiness regardless of what gear you were in if you accidentally dipped below 2000RPM. I checked all the forum threads, and it said that for california, the issue was on the J20 and the updated ECU was a J21. The Bike is listed as being part of the open recall on ECU per the dealer, so they said to just bring it in and they would replace. Well.... I checked my ECU before bringing it to the dealer and i already had a J21. The label on the new ECU is actually a J22. I've searched the forums, and I can't find any mention of a J22. Anyone know if this is a even newer update, or if it's maybe a 2018 ECU?
Rideability observations of the J22 ECU: the mid RPM vibration seems to be better, but hard to tell. The below 3200 choppiness is almost completely gone, and the below 2000 chop is smoother, but not gone. Overall a better experience, although it does also seem to be slightly weaker on power. might just be in my head. I'll see if the cold start cutout issue is there at all. I didn't really experience it heavily myself as it went away after 10-15 seconds of riding, but i'll ride and report.