I've been running 100LL since October '18 and have not see any issues with my bike. Maybe just a dirtier silencer, yet idk if that's what is causing it. Use to run 50/50, but race fuel is not easily accessible as avgas is (regional airport is a 5min drive @ $4.39/gal ) I do plan on checking the internals of my motor just to be sure everything is kosher though. Sent from my SM-G960U using Tapatalk