I got a 2001 for 421 banshee with a 4ml hot cams crank. I’ve just finished rebuilding new top in new crank and pistons everything checked out to me in the transmission. But now my dilemma The bike will not let me shift under power and sometimes I can get it to shift if I hit it just right but 90% of the time will not shift i’ve been told shift forks can be a main problem but when I open the motor up everything seem to be fine with the shift drum and shift fork and the gears so I’m trying to figure out what I’m missing thank you all for your help.