just changed to amsoil synthetic at about 2500 miles. Read a few times about the 5th to 6th gear false neutral. My bike never did it once, right after i changed to synthetic and took it out for about 30 minutes, got on it a little hard in 5th and when i went to shift to 6th and popped the clutch i got a little vibration/slight grinding and the gear indicator was blank. Pulled clutch back in and kicked hard into 6th and it engaged fine. It has done this about 4 or 5 more times now. Do i just need to quit bein a whimp and kick the shifter harder or is it something i should be concerned about. Kind of weird that it never did it once until i switched to synthetic