I just changed the oil in my '04 YZ450 and can no longer start the bike in gear!?!? I adjusted the clutch, no change. Very strange as I have never had a problem kicking in gear. Same oil. It feels like the clutch is halfway engaged when kicking in gear. Put in neutral, start, put in gear and all feels the same, meaning that the bike doesn't act like the clutch is halfway engaged when running. Very strange, any ideas?