Yamaha - Carburetor Assembly 4 - Fuel Delivery System - 64J-14904-01-00

Overview

When you’ve got a multi-carb Yamaha and one starts acting up, you feel it right away—rough idle, uneven power, or hesitation on throttle. I’ve seen plenty of times where cleaning isn’t enough, and swapping in a fresh carb is the only real fix. This assembly brings everything back into balance so the engine runs smooth across the whole range. Once it’s dialed in, you’ll notice the difference the first time you throttle up.

Key Features

• Complete Carburetor Assembly – Includes all internal components for a full fuel system replacement.
• Factory-Calibrated Performance – Delivers proper fuel-air mixture right out of the box.
• Smooth Throttle Response – Helps eliminate hesitation and uneven acceleration.
• Durable Marine Construction – Built to handle fuel exposure and harsh on-water conditions.

Engine & Boat Compatibility

Fits Yamaha outboard engines equipped with multi-carburetor systems requiring a fourth carburetor assembly. Commonly used on mid-range horsepower outboards across fishing boats, center consoles, and recreational vessels.

FAQ

Q: What are signs this carburetor needs replacing?
A: Rough idle, poor throttle response, fuel leaks, or inconsistent performance are common signs.

Q: Do I need to sync carbs after installing this?
A: Yes, syncing is important to make sure all carburetors are working evenly together.

Q: Can I replace just one carburetor instead of all of them?
A: You can, but performance is best when all carbs are in similar condition.

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

Q: Is installation difficult for a DIY job?
A: It’s manageable if you’re comfortable working with fuel systems, but proper setup is key.