I bought a 2002 YZ250 with the engine in a box and half the parts on the bike missing. I'm at the point now where I'm putting the cases back together after a flush, new bearings and seals, and crank. This is my first 2 stroke, first time taking a bike motor apart, and thus first rebuild. I'm at a point where I'm kinda stuck so I'm hoping for some assistance! 1) I don't know what the transmission was like before the bike blew the previous crank, so I don't know if it was good or not. Before I put the cases together, the transmission sat in the right side case and spun all nice and free. The forks were aligned properly in the drum and on the gears, but I'm not sure if they need replacing because the shift drum would not move the forks by hand. I would try to spin it and it would get locked up at the first "incline" part where the fork lifts up. I thought it would eventually be fine because of the added torque by shifting with your foot. Not sure if you should be able to spin the drum by hand and have it go completely counterclockwise until stopped and back again? 2) I put the cases together and the transmission REALLY stiffened up. Like almost impossible to turn by hand. Lots of drag, why is this? 3) Crank also has significant drag, even when the case screws are lightly hand tightened with a hex key. Is there something I can do to better align the crank and reduce all drag? Thanks!