Yamaha - Carburetor Assembly 3 - Fuel Delivery System - 64J-14903-01-00

Overview

When a Yamaha starts idling rough or hesitating on throttle, the carb is usually where I look first. Sometimes cleaning helps, but other times it’s just worn out internally and not worth chasing. Swapping in a complete carburetor assembly like this brings everything back into balance—fuel flow, idle, and throttle response. It’s one of those upgrades where you feel the difference right away the moment you fire it up.

Key Features

• Complete Carburetor Assembly – Includes all internal components for a full fuel system refresh.
• Factory-Calibrated Performance – Designed to deliver proper fuel-air mixture right out of the box.
• Smooth Idle Operation – Helps eliminate rough idling and hesitation during low-speed running.
• Durable Marine Build – Built to handle fuel exposure and harsh boating conditions.

Engine & Boat Compatibility

Fits Yamaha outboard engines equipped with multi-carburetor fuel systems, specifically where a third carburetor assembly is required. Commonly used on mid-range horsepower outboards found on fishing boats, center consoles, and recreational vessels.

FAQ

Q: What are signs that this carburetor needs replacing?
A: Hard starting, rough idle, poor throttle response, or fuel leaks are all common indicators.

Q: Do I need to tune this carburetor after installation?
A: It’s factory-calibrated, but minor adjustments may be needed depending on your setup.

Q: Can I replace just one carburetor or should I do all of them?
A: You can replace one, but it’s best to keep all carbs balanced for consistent performance.

Q: How does old fuel affect carburetors?
A: Old fuel can gum up internal passages and cause sticking or uneven fuel delivery.

Q: Is installation something I can handle myself?
A: If you’re comfortable syncing carbs and handling fuel lines, it’s doable—but take your time to get it right.