Naraku Racing Torque Driver Fits 2013-2015 Metropolitan NCH50 GY6 50cc QMB139

Naraku Racing Torque Driver with 2 different linear guide slots.

Most torque drivers have curved slots which is not ideal for performance gains but fine for ridability. The 2 different linear options mean you can give more emphasis to acceleration.
This is more a feature for the race track but can give the everyday commuter improved drive with no loss of performance at the rear wheel.