Remove the pin after assembling the rear cover. Pin Vacuum pump When installing the vacuum pump assembly to the generator, turn the lower left side of the three point installing section of the vacuum pump assembly (as viewed from the direction indicated by the arrow) downward for centre plate rotor alignment.

Set O-ring correctly in the O-ring groove of the rear cover assembly, install the aligned vacuum pump assembly to generator and tighten firmly with M6 screws. On completion of assembly, pour 5 cc of engine oil #30 from the oiling port. Then turn generator pulley by hand and make sure of its smooth turn. aaa