126% feed and 131% scavenge volume compared to OEM (stock) M8 fourth generation oil pumps at 1000 rpm123% feed and 146% scavenge volume compared to OEM (stock) M8 fourth generation oil pumps at 2500 rpmScavenge side discharge was improved by modifying the suction ratio to help eliminate sumping from excess oil in the crankcaseImproved oil flow by inserting an oil passage correction spacer between the large-capacity oil pump body and the cam support plateFor air-cooled models only.