3F0-87122-1 Carburetor Repair Kit for Mercury Tohatsu Nissan | JLM Marine

Carburetor Repair Kit – Fits Mercury Mariner Marine 2-Stroke 2.5 HP 3.5 HP Outboard

This carburetor repair seal kit is engineered for Mercury Mariner Marine 2-stroke outboards rated at 2.5 HP and 3.5 HP. It provides essential gaskets, seals, and components needed to restore proper carburetor function and fuel delivery.

Direct Replacement: OEM Part Number 3F0-87122-1.

• Complete seal and gasket set for carburetor overhaul
• Designed for 2-stroke Mercury Mariner outboards
• Restores proper fuel/air mixture and engine performance

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.

Technical Specifications

Package Contents

This carburetor repair kit includes:

• Complete carburetor seal and gasket set
• All necessary components for carburetor overhaul and restoration

Installation Guide

1. Disconnect the fuel line and remove the carburetor from the engine. Clean the exterior to prevent contamination during disassembly.
2. Disassemble the carburetor carefully, noting the position of jets, needle valves, and float assembly. Take photos if needed for reference.
3. Remove all old gaskets, seals, and O-rings from carburetor body and cover surfaces. Inspect for corrosion or damage.
4. Clean all metal components with carburetor cleaner and compressed air. Ensure all fuel passages and jets are clear.
5. Install new gaskets and seals from the repair kit in the same positions as the original components. Do not reuse old seals.
6. Reassemble the carburetor, ensuring float height and needle valve settings match factory specifications. Torque fasteners evenly.
7. Reinstall the carburetor onto the engine with a new mounting gasket. Connect the fuel line securely.
8. Prime the fuel system and start the engine. Adjust idle mixture and speed as needed for smooth operation.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Mercury outboard?
A: Verify your engine is a 2-stroke Mercury Mariner rated at 2.5 HP or 3.5 HP. Cross-reference OEM part number 3F0-87122-1 with your service manual or parts diagram.

Q: What are the signs my carburetor seals need replacement?
A: Common symptoms include fuel leaks around the carburetor, hard starting, rough idle, poor acceleration, or visible fuel staining on the carburetor body. If gaskets are brittle or cracked during inspection, replacement is necessary.

Q: How often should I rebuild the carburetor on my outboard?
A: Rebuild intervals depend on usage and fuel quality. For engines used in saltwater or stored long-term, inspect seals annually. If you experience fuel delivery issues or the engine has sat unused for more than one season, a carburetor rebuild is recommended.

Q: Can I reuse any of the old gaskets if they look intact?
A: No. Even gaskets that appear undamaged can have compression set or micro-cracks that cause leaks. Always replace all seals and gaskets during a carburetor rebuild to ensure a proper seal.

Q: Is this an OEM part or 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.