The motor is considered the Heart (Important part) of the treadmill as it operates the entire mechanism of the treadmill and is respon-sible for how much user-weight the treadmill can carry. Secondly, as the motor consumes a lot of electricity its quite important to have a green, efficient motor made of 100% electrolytic copper so that electricity consumption is low Therefore right motor and user weight matters. As the motor is one of the expensive parts of the treadmill you should prefer to have 3 years of Motor warranty for your uninterrupted fitness goal.