Yamaha Crankshaft and Oil Pump Set 99999-04011-00. Overview. The Yamaha Crankshaft and Oil Pump Set 99999-04011-00 is a genuine original equipment manufacturer assembly designed to support efficient engine operation by combining two critical components for power transfer and lubrication. This set ensures proper synchronization between the crankshaft and oil pump, helping maintain smooth engine performance and consistent oil circulation.. Reliable lubrication and precise mechanical movement are e