I have a 2006 crf450 that i just rebuilt the whole motor on. the bike runs great shifts through all the gears and feels like a new bike..... BUT when i go to stop the bike sometimes i just dump the clutch once stopped to kill the motor, my issue is when i do this the kick start locks up like the motor is done. i then put the bike into gear and roll it back and forth a couple times and all the sudden the kick start will kick again. the bike has never done it while running but will do it if i accidentally stall it as well. the bike does not do it if i use the kill switch. I dono were to even start with what could be causing this.... any ideas?