Carburetor Assembly – Fits Mercury/Mariner 6HP, 8HP, 9.8HP 2-Stroke Outboards (Replaces 803687T04, 18-7371)

Carburetor Assembly – Fits Mercury/Mariner 6HP, 8HP, 9.8HP 2-Stroke Outboards (Replaces 803687T04, 18-7371)

This carburetor assembly is designed for Mercury/Mariner 6HP, 8HP, and 9.8HP 2-stroke outboard engines from the 1990s to 2006. It is also compatible with select Johnson/Evinrude 9.9HP and 15HP 2-stroke models manufactured between 1993 and 2002.

It serves as a direct aftermarket replacement for a wide range of Mercury part numbers, including 803687T04, 803687T03, and 803687A04, and cross-references with Sierra part 18-7371.

• Installation: Direct OEM Replacement
• Construction: Manufactured from high-grade zinc alloy and aluminum to OEM specifications.
• Fuel Type: Designed for gasoline-fueled 2-stroke engines.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Mercury/Mariner

Johnson/Evinrude

Technical Specifications

Package Contents

• 1 x Carburetor Assembly (Replaces OEM PNs: 803687T04, 803687A04, 803687A3, 803687A2, 803687A1)

Installation Guide

1. Disconnect the battery and shut off the fuel supply. Ensure the engine is cool.
2. Carefully disconnect the fuel lines and any linkage attached to the old carburetor.
3. Remove the mounting bolts or nuts securing the carburetor to the intake manifold.
4. Gently remove the old carburetor and gasket. Clean the manifold surface thoroughly.
5. Position the new gasket and install the new carburetor assembly.
6. Tighten the mounting bolts evenly to the manufacturer's recommended torque.
7. Reconnect all fuel lines, linkages, and any vacuum hoses.
8. Turn the fuel supply back on and carefully check for any leaks.
9. Reconnect the battery.
10. Start the engine and allow it to warm up. Adjust idle and mixture screws as needed for smooth operation.

Troubleshooting & FAQ

Q: How do I confirm this carburetor fits my Mercury engine?

A: Check your engine's model and year against the "Compatible Engine Models" table. You can also use our Mercury Serial Number Guide to find your model information and verify the OEM part number matches one of the cross-references listed.

Q: What are the signs my old carburetor needs replacing?

A: Common symptoms include difficulty starting, rough idling, engine stalling at low speeds, poor acceleration, or black smoke from the exhaust, all of which can indicate a fuel and air mixture problem.

Q: Is this a direct replacement for a Johnson/Evinrude carburetor?

A: While designed primarily for Mercury outboards, this carburetor is cross-compatible with specific Johnson/Evinrude 9.9HP and 15HP models from 1993-2002 that use equivalent part numbers like 0438562. Please verify your current part number before ordering.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.