I have a question if someone could help. I have a 2004 sportsman 90. I got it from my neighbor that had done work on it and still couldn't get it running. Everything wrong. So, I am trying to put it back together with a new oil injection. What would be the assembly of the drive gear? Does it go circlip then pin then gear then last circlip then wave washer or does it go wave washer then last circlip. I had nothing to base the proper assembly from, for there was nothing there to begen with. There is nothing in the manual that touches on this. Also do you need the gear tool to put the drive gear back in? If someone could guide me through this. This is the only hang up I have.