Yamaha - Oil Pump Assembly Engine Lubrication System YF1-68513-50-12. Overview. Oil delivery is one of those things you don't want to gamble with on a Yamaha. I've seen engines come apart just because the pump wasn't keeping up or failed without much warning. The Yamaha Oil Pump Assembly YF1-68513-50-12 is what keeps that steady flow going so everything inside stays protected. When it's working right, you don't think about it-but it's doing a lot behind the scenes every time you run the motor.. Key Features. • Consistent Oil Delivery - Maintains steady lubrication to reduce engine wear and internal friction.. • Yamaha Engineered Fit - Built to factory specifications for proper integration with the oil system.. • Durable Internal Components - Designed to handle continuous operation under engine load and heat.. • Supports Engine Longevity - Helps protect critical moving parts by ensuring proper lubrication flow.. • Direct Replacement Assembly - Installs in place of the original pump duri