dissconnect your motr and spint the drive train and see if it locks up at any certain point you may have a bad bearing or broken gear tooth.
Also check the motor you may be hanging a brush do to wear or debris.
TEAM ORION - AVIONICS - KYOSHO - KO PROPO - PEAK
"Racing is about the journey not the destination if it wasn't it would simply be called Arriving"
"The solution is people need to spend more of their efforts on promoting and finding more people to race with, rather then a personal quest to form a class that they can win at."