Last night i was trying to get the drive sprocket off my 99 wr400 so i could change from a 15t to a 14t.I had the bike in gear and rear break on trying to loosen the bolt. The bolt would not move so after about one hour of frustration I went to put the bike away I pull in the clutch because it was still in first gear and went to push but the bike won't move.I put it in neutral and it is fine. I put it in 4th or 5th pull in the clutch and I can push it but as I go down gears it gets harder to push.The clutch is adjusted right and was working fine before. I have not started the engine yet. Does this sound like a problem with the clutch? Will it free up when I start the engine or have I damaged something. Has anyone else experienced this.I am at a loss as to what to do so if anyone could help it would be greatly appreciated.