Repair kit BGM PRO for the primary reduction of BGM PRO with straight-toothed primary gear (62/63 teeth) for Vespa Wideframe engines, e.g. Vespa VM, VN, VL, VB, VNA, VNB, VBA. The springs contained in the large primary gear serve as shock absorbers. They protect the gear unit from high load peaks. If they are too soft in relation to the engine torque, they are completely [...]