Yamaha - Compression Spring Pressure Control Valve Component 90501-16M11-00. Overview. The Yamaha Compression Spring 90501-16M11-00 is one of those small internal parts that plays a big role in keeping your fuel system stable. It works inside the pressure control setup, helping maintain the correct pressure so the engine runs smooth and consistent. When it weakens or wears out, you can start seeing uneven performance or fuel system issues that are hard to trace. If you're servicing the pressure control valve, this is one of those parts you replace while you're in there.. Key Features. • Pressure Regulation Support - Maintains proper tension within the pressure control valve for stable operation.. • OEM Fit Precision - Built to Yamaha specifications for correct fit and function.. • Consistent Engine Performance - Helps prevent fluctuations in fuel pressure and engine behavior.. • Durable Spring Construction - Designed to handle repeated compression cycles and engine conditions.. Engine