Yamaha - Carburetor Assembly 4 Fuel System Component 69W-14904-12-00. Overview. When a carb is dialed in, the engine just runs right-easy starts, smooth idle, and clean throttle all the way through. But once it starts wearing out or getting clogged up, you'll feel it in hesitation and rough running pretty quick. Swapping in a complete assembly like this saves time and takes the guesswork out of rebuilding. It's the kind of fix that brings an older motor back to life and makes it dependable again.. Key Features. Complete Carburetor Assembly - Provides a full replacement solution without needing internal rebuild work.. Optimized Fuel-Air Mixture - Supports smooth combustion for consistent engine performance.. OEM Fit and Calibration - Built to Yamaha specifications for proper function right out of the box.. Durable Marine Construction - Designed to handle fuel exposure and harsh on-water conditions.. Engine & Boat Compatibility. Designed for Yamaha outboard engines using carbureted fuel