Thanks for ur info, i will try it out....few more Q,
1-for example if we wrongly gear, the motor will be hot, what is the maximum tempreture for the motor to operate b4 its burn out? 70 c? 80 c? how to prevent this from happening? you mention burn brushes meaning it become black?
2-what is the disadvantage when we over tune the motor? tune too much? how do we know we tune enough? off course tune too little low rpm.