Hey guys, been lurking for a while but this is my first post here. I built the bottom end of a buddys 09 yz450 as the crank siezed on him. He took the top end off and wasn't confident enough to do the bottom so I helped him out. I do build a few motors an do work on bikes an quads as a backyard/hobby mechanic for a few extra $$. So this wasn't anything new to me. I put the crank an tranny in the cases, I spun the tranny shafts and shift drum all by hand and everything worked as good as it should. I get the whole bottom end together and give it back to him. He gets the top end on an clicks the shifter down. and it will not shift back for him. So he brings the whole bike to me last night. It was also never started yet. We took the clutch off so we can get a clear view of the shifter mechanism. It will let you shift up or down 1 gear with no problem but thats all. If i take the ratchet mechanism out and the stopper lever off I can turn the shift drum by hand and go through the gears again like it should. But as soon as I put the stopper lever back on and try to shift it, I can go 1 or 2 up and then it seems like the lever binds up the mechanism. Im at a loss of things to try to do to get him up an running. I dont know if i should take the motor apart again and see if there is something not right on the inside, it just doesnt seem like I should if the gears spin freely and the shift drum moves properly without any pressure on them. On thing I did notice is that when the shift segment is unbolted from them shift drum. I can move the drum in and out maybe 1/16" or less but there is some in an out movement on the drum. Is this normal?