Yamaha - Float Valve Assembly Carburetor Fuel Control YF1-36264-48-40. Overview. If you've ever dealt with a carb that's flooding or starving for fuel, there's a good chance the float valve was the culprit. I've replaced a lot of these on Yamahas where the engine just wouldn't idle right or kept loading up with fuel. The Yamaha Float Valve Assembly YF1-36264-48-40 helps regulate fuel inside the carb so it stays balanced and predictable. When it's working right, the engine runs clean and steady without the guesswork.. Key Features. • Precise Fuel Level Control - Regulates fuel flow into the carburetor to maintain proper levels.. • Yamaha Engineered Fit - Designed to meet factory specifications for accurate sealing and operation.. • Smooth Valve Operation - Opens and closes consistently to prevent flooding or fuel starvation.. • Fuel-Resistant Materials - Built to handle constant fuel exposure and engine conditions.. • Direct Replacement Assembly - Installs easily during carburetor servi