Aprilia Stator Cover Gasket for 21 Spec RSV4, 21 Spec Tuono V4 Aprilia never formally made a part number or part for the stator cover gasket, instead recommending a coating of silicone sealant. Since this isnt practical for most in service bikes, we started offering this rubber encapsulated steel gasket to make in the field service much easier. Bolt gasket on dry, clean both mating surfaces. torque specs same as stock 8.9ftlbs [Check for any burrs on the surfaces before installing].