Yamaha - Gear pump assy - 6C5-43830-09-00Yamaha Gear Pump Assembly Engine Lubrication Component 6C5 43830 09 00 Overview Oil flow is one thing you never want to gamble with on an outboard. This gear pump is what keeps everything inside the engine lubricated and protected while its running. When they start to wear out, youll notice changes in noise, heat, or pressure before anything else. Ive seen engines stay healthy for years just because this part was doing its job right. Key Features