The current version of Naraku torque spring uses a modified alloy steel spring and has a special spring type marking. A change is needed as soon as a tuning measure increases performance. Notable for V-belts or not running out of engines. The torque spring is always in close connection with the drive. If another spring is fitted, this will affect the switching behavior of the drive. Unlike other manufacturers, the change in speed is indicated on the Naraku springs, in which the variator connected when the rollers in the Vario are not changed. This allows a much more precise selection of the right spring than with a percentage indication. A 1500 spring makes the Vario therefore about 1500 U / min change later results