I recently have tried many ways to make Motor6D's work with LocalScripts, no success. (Tried print() too, works) However if I paste the same thing in a ServerScript, it works perfectly. Here's the code;

for i, v in pairs({FrontLeftMotor, FrontRightMotor, BackLeftMotor, BackRightMotor}) do
			if v and v.Parent then
				wait()
				local ActualBody = script.Parent:WaitForChild("Body")
				local movement = math.floor(ActualBody.Velocity.Magnitude)
				local DesiredAngle = (999999999 * (-movement/ math.abs(movement)))
				local MaxVelocity = (movement / 250)
				wait()
				v.DesiredAngle = DesiredAngle
				v.MaxVelocity = MaxVelocity
			end
		end
Anonymous