Yamaha - Carburetor Assembly 1 Fuel Delivery System 6K5-14301-03-00. Overview. The Yamaha Carburetor Assembly 1 6K5-14301-03-00 is the kind of part you swap when your engine just isn't running like it used to. If you've been dealing with rough idle, hesitation, or inconsistent throttle response, the carb is usually where the problem starts. This unit meters fuel the way it should, so the engine runs clean and predictable again. It's a solid fix when cleaning or rebuilding the old one just isn't cutting it anymore.. Key Features. • Consistent Fuel Metering - Delivers the right fuel mixture for smooth and reliable engine operation.. • OEM Fit and Calibration - Built to Yamaha specifications for proper function without guesswork.. • Improved Idle Stability - Helps eliminate rough idling and uneven engine behavior.. • Durable Marine Construction - Designed to handle vibration, fuel exposure, and harsh conditions.. Compatibility. Compatible with select Yamaha outboard engines using this car