I purchased a used 2016 Freewheeler with 6100 miles on it. After riding about 350 miles I started having issues with shifting down into first gear. All the other gears shift down smoothly. I come to a light after shifting down through the gears and shift into first but the bike doesn't recognize I'm in first or is not actually shifting down properly. Somewhere between 2nd and (neutral) 1st gear there is a problem. It will show I'm in first but when I go to take off...nothing. Goes nowhere. So I have to shift into neutral, release the clutch, pull the clutch back in and shift down into first again before it will go. One time I did that and it acted like it was in third gear. Very weird. So...I took it to the dealer and he told me it could be the actuator. Can someone please explain to me exactly what an actuator is and how it works.