Carburetor Rebuild Kit – Fits Mercury/OMC Renault 80 HP (Replaces 1398-3089, 979719)

$26.99 $43.00

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You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

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Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Carburetor Rebuild Kit provides the essential components needed to restore and maintain your marine engine's fuel system. It is specifically designed to fit Mercury Marine and OMC 80 HP Renault inline 4-cylinder engines manufactured between 1966–1969.

This kit serves as a direct replacement for Sierra 18-7080, GLM 76082, Mallory 9-37619, and original carburetors from Carter/Weber with model numbers 3951, 3971, 4207, 4208, or 4394.

Engineered for Carter/Weber C1/RBS 1-barrel carburetors.
Features corrosion-resistant materials suitable for harsh marine environments.

Part Number Matrix

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

Brand	Part Number	Notes
Mercury Marine	1398-3089	OEM
OMC	979719	OEM
Sierra	18-7080	Aftermarket
GLM	76082	Aftermarket
Mallory	9-37619	Aftermarket
Carter/Weber	3951 / 3971 / 4207 / 4208 / 4394	Original Carburetor Number

Engine & Model Compatibility

Confirm your engine model and year in the table below to ensure correct fitment.

For Mercury Marine and OMC engines, verify your model, horsepower, and serial number range where applicable to ensure compatibility.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury Marine	80 Renault	80	4-Stroke	1966–1969	1398-3089	Serial #2049045-2851423
Mercury Marine	80 Sterndrive	80	4-Stroke	1966–1969	1398-3089	Serial #2063741-2898029
OMC	Renault	80	4-Stroke	1966–1969	979719

Technical Specs

Product Type: Carburetor Rebuild Kit
Compatible Carburetors: Compatible with Carter/Weber C1/RBS 1-barrel carburetors
Fuel Type: Gasoline
Materials: Designed for marine applications with corrosion-resistant materials
Product Dimensions: 9.5" L x 6.68" W x 1.38" H

Installation Notes

Disconnect the battery and shut off the fuel supply for safety.
Carefully remove the carburetor from the engine, taking photos or notes of all linkage and hose connections.
Disassemble the carburetor on a clean, organized workbench, laying out parts in the order they are removed.
Thoroughly clean all metal components with a quality carburetor cleaner spray. Do not soak non-metal parts like diaphragms or seals in harsh chemicals.
Systematically replace the old gaskets, seals, needle and seat assembly, and any other components from the kit.
Reassemble the carburetor. Ensure the float is set to the correct height as specified in your engine's service manual.
Reinstall the rebuilt carburetor onto the engine, reconnecting all linkages and fuel lines to their original positions.
Turn on the fuel supply and check for any leaks before reconnecting the battery. Start the engine and adjust idle settings as needed.

Troubleshooting & FAQ

How do I confirm this kit fits my carburetor?

First, verify your engine model and year against the compatibility table. This kit is specifically for Carter/Weber C1/RBS 1-barrel carburetors used on 1966–1969 Mercury Marine and OMC 80 HP Renault engines. The surest method is to cross-reference the OEM part number on your existing carburetor or in your manual with the numbers listed in our Part Number Matrix.

What are common signs that my carburetor needs a rebuild?

Symptoms of a failing carburetor include difficulty starting, rough or unstable idling, stalling at low speeds, hesitation or bogging on acceleration, reduced top-end power, fuel leaks, or excessive black smoke from the exhaust, which indicates a rich fuel mixture.

Are detailed instructions or float settings included?

This kit does not include printed instructions or model-specific float settings, as these can vary. We provide generic installation steps on this page, but we strongly recommend consulting the official service manual for your specific engine model for detailed procedures, diagrams, and specifications.

How often should a marine carburetor be rebuilt?

Rebuild frequency depends on factors like usage hours, fuel quality (especially with ethanol blends), and off-season storage procedures. As a general guideline, a preventative rebuild every 3-5 years can prevent performance issues. However, if you notice any symptoms of carburetor failure, a rebuild is recommended immediately.

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 vs 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.

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