a few weeks ago i cased a tree on the shifter side of my bike. Since then I have had trouble with the shifter getting stuck between gears when shifting up or down a gear. I keep the oil changed often. However, the last oil change, I switched over to Motul 5100 10/40 synthetic. Ive got about 400 miles life to date on the bike. Should I be concerned. Just wondering if I will have to split the case.