bike is in very good condition, was riding it this summer when i stopped for a second, then started to go when it would not shift out of first gear. made several attempts to shift, would not even make any noises. drove back to the trailer in first and loaded it up. when i attempted again to start would not go into neutral, had to use the manual shifter on side of engine to shift to neutral so i could start it. is there an electric shifting sensor or cellinoid that could be out? up and down shift buttons do not make any sound when you press them. stuck for now, thanks for any response. allan