Keyway water pump pinion and oil AM6 minarelli Oil Pump Pinion Pin and Water Pump Pin for Motor AM6 Minarelli with a diameter of 3 mm and a length of 22 mm. Mounts on the following models (models equipped with the AM6 engine): Aprilia RS, RX, MX Beta RR SM, RR Enduro Conti CH Racing Wsm Wxe 50 Fantic