ER1 Doppler tension spring for 103 MVL Vogue with POLINI casing

DOPPLER is one of the few equipment manufacturers to offer this type of product. As in the heyday of moped racing, the central engine spring is an essential option for the variator and the clutch pulley. It allows the variator's progressiveness to be adapted to the engine speed. It provides the ability to adjust the spring's stiffness and prevent slipping. The engine spring is mounted on a nylon ball joint.

Please note that on 103 VOGUE S2/S2A/S2Y/VS2/S2Y, the rear mounting needs to be inverted.