Parts such as the Oil Pump: Clip, Screw, Pan Head, Circlip(1ey), Oil Pump Assy are included in the Yw100e 2001 4vpb Italy 114vp-300e1 Oil Pump parts fiche.
The Yamaha OIL PUMP has seventeen products enlisted in the schematic.
The most reasonably priced component used on the Yw100e 2001 4vpb Italy 114vp-300e1 Oil Pump is the Gasket, Breather Bolt (nas).