tace wrote:
My machine has been over heating lately making it difficult to use. I
opened the pad and only sae a white plastic block and a carbon rod
protruding from it how can i get to fix this problem of over heating?



The pad is nothing but a simple variable resistor, if it directly
controls the motor then it's normal for it to get hot as the pedal is
burning up the extra power to make the motor run slower. You could
drastically improve efficiency and low end torque by adding a PWM drive
circuit for the motor controlled by the pedal resistor. If something
else is overheating then the motor is probably overloaded.