Piston-BGM PRO 150cc, Wideframe, Faro Basso, Ø=57.5mm (1st oversize)- Vespa 1953-1959, VM, VN, ACMA (from engine V55), VB1T, VGL

Here in the 1st oversize with 57.5mm. The cylinder must be ground / honed accordingly at an engine repairer to this dimension. The piston has suitable for the grinding dimension 57.5mm the correct undersize to obtain the correct piston running clearance.ideal to repair a defective cylinder again._{AI-translation}