Yamaha - Float Carburetor Fuel Control 6F0-14985-00-00. Overview. If you've ever torn into a carburetor, you know the float is what keeps everything in balance. It's a small piece, but it controls fuel level inside the bowl, which directly affects how the engine runs. When it's off, you'll feel it-rough idle, flooding, or fuel starvation. This is one of those parts that, when it's right, the motor just settles in and runs like it should.. Key Features. • Precise Fuel Level Control - Regulates fu