Carburetor for Mercury 2 Stroke 4 hp - 5 HP 1383-8390M, 1383-9508M, 8390M, 9508M

Carburetor Assembly – Fits Mercury/Mariner 2-Stroke 4-5 HP Outboards

This is an aftermarket carburetor assembly designed for Mercury and Mariner 4 HP and 5 HP 2-stroke outboard engines. It serves as a direct replacement for multiple OEM part numbers, ensuring a precise fit and reliable performance for specified engine models.

This unit directly replaces Mercury parts 1383-8390M / 1383-9508M and 812647T1 / 812648T. It is also cross-compatible with Yamaha part numbers 6E3-14301-03, 6E3-14301-04, 6E3-14301-05, 6E0-14301-05, and 6E4-14301-71.

• Installation Method: Direct bolt-on replacement for easy installation.
• Key Features: Includes an integrated fuel pump and a manual choke mechanism.
• Housing Material: Constructed from a durable zinc alloy for corrosion resistance.

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.

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

Technical Specifications

Package Contents

• 1 x Carburetor Assembly (Replaces 1383-8390M / 1383-9508M)

Explosion Diagram

Installation Guide

1. Safety First: Shut off the fuel supply valve and disconnect the battery's negative terminal.
2. Disconnect Lines: Carefully disconnect the fuel line, throttle linkage, and choke linkage from the existing carburetor.
3. Remove Old Carburetor: Unscrew the mounting nuts or bolts that secure the carburetor to the intake manifold.
4. Clean Surface: Gently remove the old carburetor and gasket. Clean the mounting surface on the manifold thoroughly to ensure a clean, flat surface.
5. Mount New Carburetor: Place the new gasket and carburetor onto the manifold studs or bolt holes.
6. Secure in Place: Hand-tighten the mounting nuts/bolts, then torque them evenly in a crisscross pattern to the manufacturer's specification to prevent air leaks.
7. Reconnect Linkages: Reattach the throttle and choke linkages. Ensure they move smoothly without sticking or binding.
8. Reconnect Fuel Line: Securely attach the fuel line to the new carburetor's inlet.
9. Check for Leaks: Turn the fuel supply back on and carefully inspect for any signs of fuel leakage around the carburetor and fuel line fittings.
10. Final Adjustments: Reconnect the battery. Start the engine and allow it to warm up. Adjust the idle screw as needed for a smooth, stable idle.

Troubleshooting & FAQ

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

A: This carburetor fits specific 4 HP and 5 HP 2-stroke models based on the serial number. For serial numbers M-144066/ML-425196 and below, it replaces part 1383-8390M. For serial numbers M-144067/ML-425197 and above, it replaces 1383-9508M. Always verify your engine's serial number against our compatibility table before ordering.

Q: Is this a direct replacement for Yamaha carburetors too?

A: Yes, this assembly is cross-compatible with several Yamaha 4M and 5M 2-stroke models, replacing OEM part numbers like 6E3-14301-03, 6E3-14301-04, and 6E3-14301-05.

Q: What are the signs my old carburetor is failing?

A: Common symptoms include difficulty starting, rough or unstable idling, stalling at low speeds, poor acceleration, hesitation, or visible fuel leaks from the carburetor body. If you notice these issues, the carburetor may need cleaning or replacement.

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.