There's no way a re-flash will boost ultimate HP by 20HP. Wide open throttle is still wide open throttle. In the lower RPMs and in gears 1-3 there is definitely a difference on my 2015 ES, pre-Anthony flash versus post. Much different and much better motorcycle. In the real world it is much...
After reading this and other posts about leaking seals I checked my '15 ES owners manual and found nothing regarding seal maintenance. Only to check for leaks every 4K miles.
Obviously it's important that the cavity between dust and oil seals be clean (or there wouldn't be a dust seal). Seal...