Carburetor Set – Fits Yamaha 85HP 2-Stroke (Replaces 688-14301-40, 688-14302-40, 688-14303-40)

Product Details

This Carburetor Set is engineered for Yamaha 3-cylinder 85HP 2-stroke outboard motors, delivering reliable fuel metering across all three positions: top, middle, and lower. Compatible with engine models using part numbers 688-14301/02/03, this complete set ensures balanced performance and smooth operation across the full RPM range.

This aftermarket replacement directly interchanges with OEM part numbers 688-14301-40, 688-14302-40, 688-14303-40 and their respective superseded references 692-14301-36, 692-14302-36, and 692-14303-36.

• Complete 3-carburetor assembly for synchronized fuel delivery
• Includes gaskets for each carburetor position
• Direct bolt-on fitment for specified Yamaha 85HP 2-stroke models

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Application

Yamaha 3-cylinder 85HP 2-stroke outboard motors

Quantity

3 carburetors (top, middle, lower)

OEM Reference

688-14301/02/03-40

Included Gaskets

Yes, one per carburetor

Replacement Type

Aftermarket

What's in the Box

• Carburetor with gasket 3522 × 3

Installation Notes

1. Disconnect the battery and close the fuel valve before beginning work.
2. Remove the engine cowling and air intake assembly to access the existing carburetors.
3. Label and disconnect fuel lines, linkage rods, and electrical connections from each carburetor.
4. Unbolt and remove the old carburetors, noting the position: top (688-14301), middle (688-14302), and lower (688-14303).
5. Clean mounting surfaces on the intake manifold and ensure no debris enters the ports.
6. Install the new gaskets onto each carburetor position as supplied.
7. Mount each carburetor in the correct position and torque fasteners to manufacturer specifications.
8. Reconnect fuel lines, throttle/choke linkages, and electrical connections in the reverse order of removal.
9. Open the fuel valve and check all connections for leaks before starting the engine.
10. Start the engine and allow it to warm up; adjust idle and synchronization as needed per service manual.

Troubleshooting & FAQ

Will this set fit my Yamaha 85HP 2-stroke?

Yes, if your engine uses OEM part numbers 688-14301/02/03-40 or the superseded 692-14301/02/03-36. Confirm your engine is a 3-cylinder 2-stroke model before ordering.

Do I need to synchronize the carburetors after installation?

Yes, carburetor synchronization is essential for balanced performance. Use a vacuum gauge or follow your service manual's procedure to ensure all three carburetors open evenly and deliver consistent fuel flow.

Are the gaskets pre-installed or separate?

Each carburetor comes with its own gasket included in the package. Install a fresh gasket at each mounting position to prevent vacuum leaks.

How do I identify top, middle, and lower positions?

The top carburetor is 688-14301-40, middle is 688-14302-40, and lower is 688-14303-40. Label your fuel lines and linkages during removal to ensure correct reassembly.

Can I replace just one carburetor instead of all three?

While individual replacement is technically possible, replacing all three ensures consistent metering and performance. Mixing old and new units may lead to synchronization issues and uneven power delivery.

What are the signs my carburetors need replacement?

Common symptoms include rough idling, poor acceleration, excessive fuel consumption, difficulty starting, or visible fuel leaks. Worn internal components such as jets, needles, or diaphragms often necessitate full replacement.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.